File: //home/ubuntu/neovim/src/nvim/diff.c
/// @file diff.c
///
/// Code for diff'ing two, three or four buffers.
///
/// There are three ways to diff:
/// - Shell out to an external diff program, using files.
/// - Use the compiled-in xdiff library.
/// - Let 'diffexpr' do the work, using files.
#include <assert.h>
#include <ctype.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "auto/config.h"
#include "nvim/ascii_defs.h"
#include "nvim/autocmd.h"
#include "nvim/autocmd_defs.h"
#include "nvim/buffer.h"
#include "nvim/bufwrite.h"
#include "nvim/change.h"
#include "nvim/charset.h"
#include "nvim/cursor.h"
#include "nvim/diff.h"
#include "nvim/drawscreen.h"
#include "nvim/errors.h"
#include "nvim/eval.h"
#include "nvim/ex_cmds.h"
#include "nvim/ex_cmds_defs.h"
#include "nvim/ex_docmd.h"
#include "nvim/extmark.h"
#include "nvim/extmark_defs.h"
#include "nvim/fileio.h"
#include "nvim/fold.h"
#include "nvim/garray.h"
#include "nvim/garray_defs.h"
#include "nvim/gettext_defs.h"
#include "nvim/globals.h"
#include "nvim/linematch.h"
#include "nvim/mark.h"
#include "nvim/mbyte.h"
#include "nvim/mbyte_defs.h"
#include "nvim/memline.h"
#include "nvim/memory.h"
#include "nvim/message.h"
#include "nvim/move.h"
#include "nvim/normal.h"
#include "nvim/option.h"
#include "nvim/option_defs.h"
#include "nvim/option_vars.h"
#include "nvim/optionstr.h"
#include "nvim/os/fs.h"
#include "nvim/os/fs_defs.h"
#include "nvim/os/os.h"
#include "nvim/os/os_defs.h"
#include "nvim/os/shell.h"
#include "nvim/path.h"
#include "nvim/pos_defs.h"
#include "nvim/strings.h"
#include "nvim/types_defs.h"
#include "nvim/ui.h"
#include "nvim/undo.h"
#include "nvim/vim_defs.h"
#include "nvim/window.h"
#include "xdiff/xdiff.h"
static bool diff_busy = false; // using diff structs, don't change them
static bool diff_need_update = false; // ex_diffupdate needs to be called
// Flags obtained from the 'diffopt' option
#define DIFF_FILLER 0x001 // display filler lines
#define DIFF_IBLANK 0x002 // ignore empty lines
#define DIFF_ICASE 0x004 // ignore case
#define DIFF_IWHITE 0x008 // ignore change in white space
#define DIFF_IWHITEALL 0x010 // ignore all white space changes
#define DIFF_IWHITEEOL 0x020 // ignore change in white space at EOL
#define DIFF_HORIZONTAL 0x040 // horizontal splits
#define DIFF_VERTICAL 0x080 // vertical splits
#define DIFF_HIDDEN_OFF 0x100 // diffoff when hidden
#define DIFF_INTERNAL 0x200 // use internal xdiff algorithm
#define DIFF_CLOSE_OFF 0x400 // diffoff when closing window
#define DIFF_FOLLOWWRAP 0x800 // follow the wrap option
#define DIFF_LINEMATCH 0x1000 // match most similar lines within diff
#define ALL_WHITE_DIFF (DIFF_IWHITE | DIFF_IWHITEALL | DIFF_IWHITEEOL)
static int diff_flags = DIFF_INTERNAL | DIFF_FILLER | DIFF_CLOSE_OFF;
static int diff_algorithm = 0;
static int linematch_lines = 0;
#define LBUFLEN 50 // length of line in diff file
// kTrue when "diff -a" works, kFalse when it doesn't work,
// kNone when not checked yet
static TriState diff_a_works = kNone;
// used for diff input
typedef struct {
char *din_fname; // used for external diff
mmfile_t din_mmfile; // used for internal diff
} diffin_T;
// used for diff result
typedef struct {
char *dout_fname; // used for external diff
garray_T dout_ga; // used for internal diff
} diffout_T;
// used for recording hunks from xdiff
typedef struct {
linenr_T lnum_orig;
int count_orig;
linenr_T lnum_new;
int count_new;
} diffhunk_T;
// two diff inputs and one result
typedef struct {
diffin_T dio_orig; // original file input
diffin_T dio_new; // new file input
diffout_T dio_diff; // diff result
int dio_internal; // using internal diff
} diffio_T;
typedef enum {
DIFF_ED,
DIFF_UNIFIED,
DIFF_NONE,
} diffstyle_T;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "diff.c.generated.h"
#endif
/// Called when deleting or unloading a buffer: No longer make a diff with it.
///
/// @param buf
void diff_buf_delete(buf_T *buf)
{
FOR_ALL_TABS(tp) {
int i = diff_buf_idx(buf, tp);
if (i != DB_COUNT) {
tp->tp_diffbuf[i] = NULL;
tp->tp_diff_invalid = true;
if (tp == curtab) {
// don't redraw right away, more might change or buffer state
// is invalid right now
need_diff_redraw = true;
redraw_later(curwin, UPD_VALID);
}
}
}
}
/// Check if the current buffer should be added to or removed from the list of
/// diff buffers.
///
/// @param win
void diff_buf_adjust(win_T *win)
{
if (!win->w_p_diff) {
// When there is no window showing a diff for this buffer, remove
// it from the diffs.
bool found_win = false;
FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
if ((wp->w_buffer == win->w_buffer) && wp->w_p_diff) {
found_win = true;
}
}
if (!found_win) {
int i = diff_buf_idx(win->w_buffer, curtab);
if (i != DB_COUNT) {
curtab->tp_diffbuf[i] = NULL;
curtab->tp_diff_invalid = true;
diff_redraw(true);
}
}
} else {
diff_buf_add(win->w_buffer);
}
}
/// Add a buffer to make diffs for.
///
/// Call this when a new buffer is being edited in the current window where
/// 'diff' is set.
/// Marks the current buffer as being part of the diff and requiring updating.
/// This must be done before any autocmd, because a command may use info
/// about the screen contents.
///
/// @param buf The buffer to add.
void diff_buf_add(buf_T *buf)
{
if (diff_buf_idx(buf, curtab) != DB_COUNT) {
// It's already there.
return;
}
for (int i = 0; i < DB_COUNT; i++) {
if (curtab->tp_diffbuf[i] == NULL) {
curtab->tp_diffbuf[i] = buf;
curtab->tp_diff_invalid = true;
diff_redraw(true);
return;
}
}
semsg(_("E96: Cannot diff more than %" PRId64 " buffers"), (int64_t)DB_COUNT);
}
/// Remove all buffers to make diffs for.
static void diff_buf_clear(void)
{
for (int i = 0; i < DB_COUNT; i++) {
if (curtab->tp_diffbuf[i] != NULL) {
curtab->tp_diffbuf[i] = NULL;
curtab->tp_diff_invalid = true;
diff_redraw(true);
}
}
}
/// Find buffer "buf" in the list of diff buffers for tab page "tp".
///
/// @param buf
/// @param tp
///
/// @return its index or DB_COUNT if not found.
static int diff_buf_idx(buf_T *buf, tabpage_T *tp)
{
int idx;
for (idx = 0; idx < DB_COUNT; idx++) {
if (tp->tp_diffbuf[idx] == buf) {
break;
}
}
return idx;
}
/// Mark the diff info involving buffer "buf" as invalid, it will be updated
/// when info is requested.
///
/// @param buf
void diff_invalidate(buf_T *buf)
{
FOR_ALL_TABS(tp) {
int i = diff_buf_idx(buf, tp);
if (i != DB_COUNT) {
tp->tp_diff_invalid = true;
if (tp == curtab) {
diff_redraw(true);
}
}
}
}
/// Called by mark_adjust(): update line numbers in "buf".
///
/// @param line1
/// @param line2
/// @param amount
/// @param amount_after
void diff_mark_adjust(buf_T *buf, linenr_T line1, linenr_T line2, linenr_T amount,
linenr_T amount_after)
{
// Handle all tab pages that use "buf" in a diff.
FOR_ALL_TABS(tp) {
int idx = diff_buf_idx(buf, tp);
if (idx != DB_COUNT) {
diff_mark_adjust_tp(tp, idx, line1, line2, amount, amount_after);
}
}
}
/// Update line numbers in tab page "tp" for the buffer with index "idx".
///
/// This attempts to update the changes as much as possible:
/// When inserting/deleting lines outside of existing change blocks, create a
/// new change block and update the line numbers in following blocks.
/// When inserting/deleting lines in existing change blocks, update them.
///
/// @param tp
/// @param idx
/// @param line1
/// @param line2
/// @param amount
/// @amount_after
static void diff_mark_adjust_tp(tabpage_T *tp, int idx, linenr_T line1, linenr_T line2,
linenr_T amount, linenr_T amount_after)
{
if (diff_internal()) {
// Will update diffs before redrawing. Set _invalid to update the
// diffs themselves, set _update to also update folds properly just
// before redrawing.
// Do update marks here, it is needed for :%diffput.
tp->tp_diff_invalid = true;
tp->tp_diff_update = true;
}
linenr_T inserted;
linenr_T deleted;
if (line2 == MAXLNUM) {
// mark_adjust(99, MAXLNUM, 9, 0): insert lines
inserted = amount;
deleted = 0;
} else if (amount_after > 0) {
// mark_adjust(99, 98, MAXLNUM, 9): a change that inserts lines
inserted = amount_after;
deleted = 0;
} else {
// mark_adjust(98, 99, MAXLNUM, -2): delete lines
inserted = 0;
deleted = -amount_after;
}
diff_T *dprev = NULL;
diff_T *dp = tp->tp_first_diff;
linenr_T lnum_deleted = line1; // lnum of remaining deletion
while (true) {
// If the change is after the previous diff block and before the next
// diff block, thus not touching an existing change, create a new diff
// block. Don't do this when ex_diffgetput() is busy.
if (((dp == NULL)
|| (dp->df_lnum[idx] - 1 > line2)
|| ((line2 == MAXLNUM) && (dp->df_lnum[idx] > line1)))
&& ((dprev == NULL)
|| (dprev->df_lnum[idx] + dprev->df_count[idx] < line1))
&& !diff_busy) {
diff_T *dnext = diff_alloc_new(tp, dprev, dp);
dnext->df_lnum[idx] = line1;
dnext->df_count[idx] = inserted;
for (int i = 0; i < DB_COUNT; i++) {
if ((tp->tp_diffbuf[i] != NULL) && (i != idx)) {
if (dprev == NULL) {
dnext->df_lnum[i] = line1;
} else {
dnext->df_lnum[i] = line1
+ (dprev->df_lnum[i] + dprev->df_count[i])
- (dprev->df_lnum[idx] + dprev->df_count[idx]);
}
dnext->df_count[i] = deleted;
}
}
}
// if at end of the list, quit
if (dp == NULL) {
break;
}
// Check for these situations:
// 1 2 3
// 1 2 3
// line1 2 3 4 5
// 2 3 4 5
// 2 3 4 5
// line2 2 3 4 5
// 3 5 6
// 3 5 6
// compute last line of this change
linenr_T last = dp->df_lnum[idx] + dp->df_count[idx] - 1;
// 1. change completely above line1: nothing to do
if (last >= line1 - 1) {
// 6. change below line2: only adjust for amount_after; also when
// "deleted" became zero when deleted all lines between two diffs.
if (dp->df_lnum[idx] - (deleted + inserted != 0) > line2 - dp->is_linematched) {
if (amount_after == 0) {
// nothing left to change
break;
}
dp->df_lnum[idx] += amount_after;
} else {
bool check_unchanged = false;
// 2. 3. 4. 5.: inserted/deleted lines touching this diff.
if (deleted > 0) {
linenr_T n;
linenr_T off = 0;
if (dp->df_lnum[idx] >= line1) {
if (last <= line2) {
// 4. delete all lines of diff
if ((dp->df_next != NULL)
&& (dp->df_next->df_lnum[idx] - 1 <= line2)) {
// delete continues in next diff, only do
// lines until that one
n = dp->df_next->df_lnum[idx] - lnum_deleted;
deleted -= n;
n -= dp->df_count[idx];
lnum_deleted = dp->df_next->df_lnum[idx];
} else {
n = deleted - dp->df_count[idx];
}
dp->df_count[idx] = 0;
} else {
// 5. delete lines at or just before top of diff
off = dp->df_lnum[idx] - lnum_deleted;
n = off;
dp->df_count[idx] -= line2 - dp->df_lnum[idx] + 1;
check_unchanged = true;
}
dp->df_lnum[idx] = line1;
} else {
if (last < line2) {
// 2. delete at end of diff
dp->df_count[idx] -= last - lnum_deleted + 1;
if ((dp->df_next != NULL)
&& (dp->df_next->df_lnum[idx] - 1 <= line2)) {
// delete continues in next diff, only do
// lines until that one
n = dp->df_next->df_lnum[idx] - 1 - last;
deleted -= dp->df_next->df_lnum[idx] - lnum_deleted;
lnum_deleted = dp->df_next->df_lnum[idx];
} else {
n = line2 - last;
}
check_unchanged = true;
} else {
// 3. delete lines inside the diff
n = 0;
dp->df_count[idx] -= deleted;
}
}
for (int i = 0; i < DB_COUNT; i++) {
if ((tp->tp_diffbuf[i] != NULL) && (i != idx)) {
if (dp->df_lnum[i] > off) {
dp->df_lnum[i] -= off;
} else {
dp->df_lnum[i] = 1;
}
dp->df_count[i] += n;
}
}
} else {
if (dp->df_lnum[idx] <= line1) {
// inserted lines somewhere in this diff
dp->df_count[idx] += inserted;
check_unchanged = true;
} else {
// inserted lines somewhere above this diff
dp->df_lnum[idx] += inserted;
}
}
if (check_unchanged) {
// Check if inserted lines are equal, may reduce the size of the
// diff.
//
// TODO(unknown): also check for equal lines in the middle and perhaps split
// the block.
diff_check_unchanged(tp, dp);
}
}
}
// check if this block touches the previous one, may merge them.
if ((dprev != NULL) && !dp->is_linematched
&& (dprev->df_lnum[idx] + dprev->df_count[idx] == dp->df_lnum[idx])) {
for (int i = 0; i < DB_COUNT; i++) {
if (tp->tp_diffbuf[i] != NULL) {
dprev->df_count[i] += dp->df_count[i];
}
}
dp = diff_free(tp, dprev, dp);
} else {
// Advance to next entry.
dprev = dp;
dp = dp->df_next;
}
}
dprev = NULL;
dp = tp->tp_first_diff;
while (dp != NULL) {
// All counts are zero, remove this entry.
int i;
for (i = 0; i < DB_COUNT; i++) {
if ((tp->tp_diffbuf[i] != NULL) && (dp->df_count[i] != 0)) {
break;
}
}
if (i == DB_COUNT) {
dp = diff_free(tp, dprev, dp);
} else {
// Advance to next entry.
dprev = dp;
dp = dp->df_next;
}
}
if (tp == curtab) {
// Don't redraw right away, this updates the diffs, which can be slow.
need_diff_redraw = true;
// Need to recompute the scroll binding, may remove or add filler
// lines (e.g., when adding lines above w_topline). But it's slow when
// making many changes, postpone until redrawing.
diff_need_scrollbind = true;
}
}
/// Allocate a new diff block and link it between "dprev" and "dp".
///
/// @param tp
/// @param dprev
/// @param dp
///
/// @return The new diff block.
static diff_T *diff_alloc_new(tabpage_T *tp, diff_T *dprev, diff_T *dp)
{
diff_T *dnew = xmalloc(sizeof(*dnew));
dnew->is_linematched = false;
dnew->df_next = dp;
if (dprev == NULL) {
tp->tp_first_diff = dnew;
} else {
dprev->df_next = dnew;
}
return dnew;
}
static diff_T *diff_free(tabpage_T *tp, diff_T *dprev, diff_T *dp)
{
diff_T *ret = dp->df_next;
xfree(dp);
if (dprev == NULL) {
tp->tp_first_diff = ret;
} else {
dprev->df_next = ret;
}
return ret;
}
/// Check if the diff block "dp" can be made smaller for lines at the start and
/// end that are equal. Called after inserting lines.
///
/// This may result in a change where all buffers have zero lines, the caller
/// must take care of removing it.
///
/// @param tp
/// @param dp
static void diff_check_unchanged(tabpage_T *tp, diff_T *dp)
{
// Find the first buffers, use it as the original, compare the other
// buffer lines against this one.
int i_org;
for (i_org = 0; i_org < DB_COUNT; i_org++) {
if (tp->tp_diffbuf[i_org] != NULL) {
break;
}
}
// safety check
if (i_org == DB_COUNT) {
return;
}
if (diff_check_sanity(tp, dp) == FAIL) {
return;
}
// First check lines at the top, then at the bottom.
linenr_T off_org = 0;
linenr_T off_new = 0;
int dir = FORWARD;
while (true) {
// Repeat until a line is found which is different or the number of
// lines has become zero.
while (dp->df_count[i_org] > 0) {
// Copy the line, the next ml_get() will invalidate it.
if (dir == BACKWARD) {
off_org = dp->df_count[i_org] - 1;
}
char *line_org = xstrdup(ml_get_buf(tp->tp_diffbuf[i_org], dp->df_lnum[i_org] + off_org));
int i_new;
for (i_new = i_org + 1; i_new < DB_COUNT; i_new++) {
if (tp->tp_diffbuf[i_new] == NULL) {
continue;
}
if (dir == BACKWARD) {
off_new = dp->df_count[i_new] - 1;
}
// if other buffer doesn't have this line, it was inserted
if ((off_new < 0) || (off_new >= dp->df_count[i_new])) {
break;
}
if (diff_cmp(line_org, ml_get_buf(tp->tp_diffbuf[i_new],
dp->df_lnum[i_new] + off_new)) != 0) {
break;
}
}
xfree(line_org);
// Stop when a line isn't equal in all diff buffers.
if (i_new != DB_COUNT) {
break;
}
// Line matched in all buffers, remove it from the diff.
for (i_new = i_org; i_new < DB_COUNT; i_new++) {
if (tp->tp_diffbuf[i_new] != NULL) {
if (dir == FORWARD) {
dp->df_lnum[i_new]++;
}
dp->df_count[i_new]--;
}
}
}
if (dir == BACKWARD) {
break;
}
dir = BACKWARD;
}
}
/// Check if a diff block doesn't contain invalid line numbers.
/// This can happen when the diff program returns invalid results.
///
/// @param tp
/// @param dp
///
/// @return OK if the diff block doesn't contain invalid line numbers.
static int diff_check_sanity(tabpage_T *tp, diff_T *dp)
{
for (int i = 0; i < DB_COUNT; i++) {
if (tp->tp_diffbuf[i] != NULL) {
if (dp->df_lnum[i] + dp->df_count[i] - 1
> tp->tp_diffbuf[i]->b_ml.ml_line_count) {
return FAIL;
}
}
}
return OK;
}
/// Mark all diff buffers in the current tab page for redraw.
///
/// @param dofold Also recompute the folds
void diff_redraw(bool dofold)
{
win_T *wp_other = NULL;
bool used_max_fill_other = false;
bool used_max_fill_curwin = false;
need_diff_redraw = false;
FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
// when closing windows or wiping buffers skip invalid window
if (!wp->w_p_diff || !buf_valid(wp->w_buffer)) {
continue;
}
redraw_later(wp, UPD_SOME_VALID);
if (wp != curwin) {
wp_other = wp;
}
if (dofold && foldmethodIsDiff(wp)) {
foldUpdateAll(wp);
}
// A change may have made filler lines invalid, need to take care of
// that for other windows.
int n = diff_check(wp, wp->w_topline);
if (((wp != curwin) && (wp->w_topfill > 0)) || (n > 0)) {
if (wp->w_topfill > n) {
wp->w_topfill = MAX(n, 0);
} else if ((n > 0) && (n > wp->w_topfill)) {
wp->w_topfill = n;
if (wp == curwin) {
used_max_fill_curwin = true;
} else if (wp_other != NULL) {
used_max_fill_other = true;
}
}
check_topfill(wp, false);
}
}
if (wp_other != NULL && curwin->w_p_scb) {
if (used_max_fill_curwin) {
// The current window was set to use the maximum number of filler
// lines, may need to reduce them.
diff_set_topline(wp_other, curwin);
} else if (used_max_fill_other) {
// The other window was set to use the maximum number of filler
// lines, may need to reduce them.
diff_set_topline(curwin, wp_other);
}
}
}
static void clear_diffin(diffin_T *din)
{
if (din->din_fname == NULL) {
XFREE_CLEAR(din->din_mmfile.ptr);
} else {
os_remove(din->din_fname);
}
}
static void clear_diffout(diffout_T *dout)
{
if (dout->dout_fname == NULL) {
ga_clear(&dout->dout_ga);
} else {
os_remove(dout->dout_fname);
}
}
/// Write buffer "buf" to a memory buffer.
///
/// @param buf
/// @param din
///
/// @return FAIL for failure.
static int diff_write_buffer(buf_T *buf, mmfile_t *m, linenr_T start, linenr_T end)
{
size_t len = 0;
if (end < 0) {
end = buf->b_ml.ml_line_count;
}
// xdiff requires one big block of memory with all the text.
for (linenr_T lnum = start; lnum <= end; lnum++) {
len += (size_t)ml_get_buf_len(buf, lnum) + 1;
}
char *ptr = xmalloc(len);
m->ptr = ptr;
m->size = (int)len;
len = 0;
for (linenr_T lnum = start; lnum <= end; lnum++) {
char *s = ml_get_buf(buf, lnum);
if (diff_flags & DIFF_ICASE) {
while (*s != NUL) {
char cbuf[MB_MAXBYTES + 1];
// xdiff doesn't support ignoring case, fold-case the text.
int c = *s == NL ? NUL : utf_fold(utf_ptr2char(s));
const int orig_len = utfc_ptr2len(s);
// TODO(Bram): handle byte length difference
char *s1 = (utf_char2bytes(c, cbuf) != orig_len) ? s : cbuf;
memmove(ptr + len, s1, (size_t)orig_len);
s += orig_len;
len += (size_t)orig_len;
}
} else {
size_t slen = strlen(s);
memmove(ptr + len, s, slen);
// NUL is represented as NL; convert
memchrsub(ptr + len, NL, NUL, slen);
len += slen;
}
ptr[len++] = NL;
}
return OK;
}
/// Write buffer "buf" to file or memory buffer.
///
/// Always use 'fileformat' set to "unix".
///
/// @param buf
/// @param din
///
/// @return FAIL for failure
static int diff_write(buf_T *buf, diffin_T *din)
{
if (din->din_fname == NULL) {
return diff_write_buffer(buf, &din->din_mmfile, 1, -1);
}
// Always use 'fileformat' set to "unix".
char *save_ff = buf->b_p_ff;
buf->b_p_ff = xstrdup(FF_UNIX);
const bool save_cmod_flags = cmdmod.cmod_flags;
// Writing the buffer is an implementation detail of performing the diff,
// so it shouldn't update the '[ and '] marks.
cmdmod.cmod_flags |= CMOD_LOCKMARKS;
int r = buf_write(buf, din->din_fname, NULL,
1, buf->b_ml.ml_line_count,
NULL, false, false, false, true);
cmdmod.cmod_flags = save_cmod_flags;
free_string_option(buf->b_p_ff);
buf->b_p_ff = save_ff;
return r;
}
/// Update the diffs for all buffers involved.
///
/// @param dio
/// @param idx_orig
/// @param eap can be NULL
static void diff_try_update(diffio_T *dio, int idx_orig, exarg_T *eap)
{
if (dio->dio_internal) {
ga_init(&dio->dio_diff.dout_ga, sizeof(diffhunk_T), 100);
} else {
// We need three temp file names.
dio->dio_orig.din_fname = vim_tempname();
dio->dio_new.din_fname = vim_tempname();
dio->dio_diff.dout_fname = vim_tempname();
if (dio->dio_orig.din_fname == NULL
|| dio->dio_new.din_fname == NULL
|| dio->dio_diff.dout_fname == NULL) {
goto theend;
}
// Check external diff is actually working.
if (check_external_diff(dio) == FAIL) {
goto theend;
}
}
// :diffupdate!
if (eap != NULL && eap->forceit) {
for (int idx_new = idx_orig; idx_new < DB_COUNT; idx_new++) {
buf_T *buf = curtab->tp_diffbuf[idx_new];
if (buf_valid(buf)) {
buf_check_timestamp(buf);
}
}
}
{
// Write the first buffer to a tempfile or mmfile_t.
buf_T *buf = curtab->tp_diffbuf[idx_orig];
if (diff_write(buf, &dio->dio_orig) == FAIL) {
goto theend;
}
}
// Make a difference between the first buffer and every other.
for (int idx_new = idx_orig + 1; idx_new < DB_COUNT; idx_new++) {
buf_T *buf = curtab->tp_diffbuf[idx_new];
if (buf == NULL || buf->b_ml.ml_mfp == NULL) {
continue; // skip buffer that isn't loaded
}
// Write the other buffer and diff with the first one.
if (diff_write(buf, &dio->dio_new) == FAIL) {
continue;
}
if (diff_file(dio) == FAIL) {
continue;
}
// Read the diff output and add each entry to the diff list.
diff_read(idx_orig, idx_new, dio);
clear_diffin(&dio->dio_new);
clear_diffout(&dio->dio_diff);
}
clear_diffin(&dio->dio_orig);
theend:
xfree(dio->dio_orig.din_fname);
xfree(dio->dio_new.din_fname);
xfree(dio->dio_diff.dout_fname);
}
/// Return true if the options are set to use the internal diff library.
/// Note that if the internal diff failed for one of the buffers, the external
/// diff will be used anyway.
int diff_internal(void)
FUNC_ATTR_PURE
{
return (diff_flags & DIFF_INTERNAL) != 0 && *p_dex == NUL;
}
/// Completely update the diffs for the buffers involved.
///
/// When using the external "diff" command the buffers are written to a file,
/// also for unmodified buffers (the file could have been produced by
/// autocommands, e.g. the netrw plugin).
///
/// @param eap can be NULL
void ex_diffupdate(exarg_T *eap)
{
if (diff_busy) {
diff_need_update = true;
return;
}
int had_diffs = curtab->tp_first_diff != NULL;
// Delete all diffblocks.
diff_clear(curtab);
curtab->tp_diff_invalid = false;
// Use the first buffer as the original text.
int idx_orig;
for (idx_orig = 0; idx_orig < DB_COUNT; idx_orig++) {
if (curtab->tp_diffbuf[idx_orig] != NULL) {
break;
}
}
if (idx_orig == DB_COUNT) {
goto theend;
}
// Only need to do something when there is another buffer.
int idx_new;
for (idx_new = idx_orig + 1; idx_new < DB_COUNT; idx_new++) {
if (curtab->tp_diffbuf[idx_new] != NULL) {
break;
}
}
if (idx_new == DB_COUNT) {
goto theend;
}
// Only use the internal method if it did not fail for one of the buffers.
diffio_T diffio;
CLEAR_FIELD(diffio);
diffio.dio_internal = diff_internal();
diff_try_update(&diffio, idx_orig, eap);
// force updating cursor position on screen
curwin->w_valid_cursor.lnum = 0;
theend:
// A redraw is needed if there were diffs and they were cleared, or there
// are diffs now, which means they got updated.
if (had_diffs || curtab->tp_first_diff != NULL) {
diff_redraw(true);
apply_autocmds(EVENT_DIFFUPDATED, NULL, NULL, false, curbuf);
}
}
/// Do a quick test if "diff" really works. Otherwise it looks like there
/// are no differences. Can't use the return value, it's non-zero when
/// there are differences.
static int check_external_diff(diffio_T *diffio)
{
// May try twice, first with "-a" and then without.
bool io_error = false;
TriState ok = kFalse;
while (true) {
ok = kFalse;
FILE *fd = os_fopen(diffio->dio_orig.din_fname, "w");
if (fd == NULL) {
io_error = true;
} else {
if (fwrite("line1\n", 6, 1, fd) != 1) {
io_error = true;
}
fclose(fd);
fd = os_fopen(diffio->dio_new.din_fname, "w");
if (fd == NULL) {
io_error = true;
} else {
if (fwrite("line2\n", 6, 1, fd) != 1) {
io_error = true;
}
fclose(fd);
fd = diff_file(diffio) == OK
? os_fopen(diffio->dio_diff.dout_fname, "r")
: NULL;
if (fd == NULL) {
io_error = true;
} else {
char linebuf[LBUFLEN];
while (true) {
// For normal diff there must be a line that contains
// "1c1". For unified diff "@@ -1 +1 @@".
if (vim_fgets(linebuf, LBUFLEN, fd)) {
break;
}
if (strncmp(linebuf, "1c1", 3) == 0
|| strncmp(linebuf, "@@ -1 +1 @@", 11) == 0) {
ok = kTrue;
}
}
fclose(fd);
}
os_remove(diffio->dio_diff.dout_fname);
os_remove(diffio->dio_new.din_fname);
}
os_remove(diffio->dio_orig.din_fname);
}
// When using 'diffexpr' break here.
if (*p_dex != NUL) {
break;
}
// If we checked if "-a" works already, break here.
if (diff_a_works != kNone) {
break;
}
diff_a_works = ok;
// If "-a" works break here, otherwise retry without "-a".
if (ok) {
break;
}
}
if (!ok) {
if (io_error) {
emsg(_("E810: Cannot read or write temp files"));
}
emsg(_("E97: Cannot create diffs"));
diff_a_works = kNone;
return FAIL;
}
return OK;
}
/// Invoke the xdiff function.
static int diff_file_internal(diffio_T *diffio)
{
xpparam_t param;
xdemitconf_t emit_cfg;
xdemitcb_t emit_cb;
CLEAR_FIELD(param);
CLEAR_FIELD(emit_cfg);
CLEAR_FIELD(emit_cb);
param.flags = (unsigned long)diff_algorithm;
if (diff_flags & DIFF_IWHITE) {
param.flags |= XDF_IGNORE_WHITESPACE_CHANGE;
}
if (diff_flags & DIFF_IWHITEALL) {
param.flags |= XDF_IGNORE_WHITESPACE;
}
if (diff_flags & DIFF_IWHITEEOL) {
param.flags |= XDF_IGNORE_WHITESPACE_AT_EOL;
}
if (diff_flags & DIFF_IBLANK) {
param.flags |= XDF_IGNORE_BLANK_LINES;
}
emit_cfg.ctxlen = 0; // don't need any diff_context here
emit_cb.priv = &diffio->dio_diff;
emit_cfg.hunk_func = xdiff_out;
if (xdl_diff(&diffio->dio_orig.din_mmfile,
&diffio->dio_new.din_mmfile,
¶m, &emit_cfg, &emit_cb) < 0) {
emsg(_("E960: Problem creating the internal diff"));
return FAIL;
}
return OK;
}
/// Make a diff between files "tmp_orig" and "tmp_new", results in "tmp_diff".
///
/// @param dio
///
/// @return OK or FAIL
static int diff_file(diffio_T *dio)
{
char *tmp_orig = dio->dio_orig.din_fname;
char *tmp_new = dio->dio_new.din_fname;
char *tmp_diff = dio->dio_diff.dout_fname;
if (*p_dex != NUL) {
// Use 'diffexpr' to generate the diff file.
eval_diff(tmp_orig, tmp_new, tmp_diff);
return OK;
}
// Use xdiff for generating the diff.
if (dio->dio_internal) {
return diff_file_internal(dio);
}
const size_t len = (strlen(tmp_orig) + strlen(tmp_new) + strlen(tmp_diff)
+ strlen(p_srr) + 27);
char *const cmd = xmalloc(len);
// We don't want $DIFF_OPTIONS to get in the way.
if (os_getenv("DIFF_OPTIONS")) {
os_unsetenv("DIFF_OPTIONS");
}
// Build the diff command and execute it. Always use -a, binary
// differences are of no use. Ignore errors, diff returns
// non-zero when differences have been found.
vim_snprintf(cmd, len, "diff %s%s%s%s%s%s%s%s %s",
diff_a_works == kFalse ? "" : "-a ",
"",
(diff_flags & DIFF_IWHITE) ? "-b " : "",
(diff_flags & DIFF_IWHITEALL) ? "-w " : "",
(diff_flags & DIFF_IWHITEEOL) ? "-Z " : "",
(diff_flags & DIFF_IBLANK) ? "-B " : "",
(diff_flags & DIFF_ICASE) ? "-i " : "",
tmp_orig, tmp_new);
append_redir(cmd, len, p_srr, tmp_diff);
block_autocmds(); // Avoid ShellCmdPost stuff
call_shell(cmd,
kShellOptFilter | kShellOptSilent | kShellOptDoOut,
NULL);
unblock_autocmds();
xfree(cmd);
return OK;
}
/// Create a new version of a file from the current buffer and a diff file.
///
/// The buffer is written to a file, also for unmodified buffers (the file
/// could have been produced by autocommands, e.g. the netrw plugin).
///
/// @param eap
void ex_diffpatch(exarg_T *eap)
{
char *buf = NULL;
win_T *old_curwin = curwin;
char *newname = NULL; // name of patched file buffer
char *esc_name = NULL;
#ifdef UNIX
char *fullname = NULL;
#endif
// We need two temp file names.
// Name of original temp file.
char *tmp_orig = vim_tempname();
// Name of patched temp file.
char *tmp_new = vim_tempname();
if ((tmp_orig == NULL) || (tmp_new == NULL)) {
goto theend;
}
// Write the current buffer to "tmp_orig".
if (buf_write(curbuf, tmp_orig, NULL,
1, curbuf->b_ml.ml_line_count,
NULL, false, false, false, true) == FAIL) {
goto theend;
}
#ifdef UNIX
// Get the absolute path of the patchfile, changing directory below.
fullname = FullName_save(eap->arg, false);
esc_name = vim_strsave_shellescape(fullname != NULL ? fullname : eap->arg, true, true);
#else
esc_name = vim_strsave_shellescape(eap->arg, true, true);
#endif
size_t buflen = strlen(tmp_orig) + strlen(esc_name) + strlen(tmp_new) + 16;
buf = xmalloc(buflen);
#ifdef UNIX
char dirbuf[MAXPATHL];
// Temporarily chdir to /tmp, to avoid patching files in the current
// directory when the patch file contains more than one patch. When we
// have our own temp dir use that instead, it will be cleaned up when we
// exit (any .rej files created). Don't change directory if we can't
// return to the current.
if ((os_dirname(dirbuf, MAXPATHL) != OK)
|| (os_chdir(dirbuf) != 0)) {
dirbuf[0] = NUL;
} else {
char *tempdir = vim_gettempdir();
if (tempdir == NULL) {
tempdir = "/tmp";
}
os_chdir(tempdir);
shorten_fnames(true);
}
#endif
if (*p_pex != NUL) {
// Use 'patchexpr' to generate the new file.
#ifdef UNIX
eval_patch(tmp_orig, (fullname != NULL ? fullname : eap->arg), tmp_new);
#else
eval_patch(tmp_orig, eap->arg, tmp_new);
#endif
} else {
// Build the patch command and execute it. Ignore errors.
vim_snprintf(buf, buflen, "patch -o %s %s < %s",
tmp_new, tmp_orig, esc_name);
block_autocmds(); // Avoid ShellCmdPost stuff
call_shell(buf, kShellOptFilter, NULL);
unblock_autocmds();
}
#ifdef UNIX
if (dirbuf[0] != NUL) {
if (os_chdir(dirbuf) != 0) {
emsg(_(e_prev_dir));
}
shorten_fnames(true);
}
#endif
// Delete any .orig or .rej file created.
STRCPY(buf, tmp_new);
strcat(buf, ".orig");
os_remove(buf);
STRCPY(buf, tmp_new);
strcat(buf, ".rej");
os_remove(buf);
// Only continue if the output file was created.
FileInfo file_info;
bool info_ok = os_fileinfo(tmp_new, &file_info);
uint64_t filesize = os_fileinfo_size(&file_info);
if (!info_ok || filesize == 0) {
emsg(_("E816: Cannot read patch output"));
} else {
if (curbuf->b_fname != NULL) {
newname = xstrnsave(curbuf->b_fname, strlen(curbuf->b_fname) + 4);
strcat(newname, ".new");
}
// don't use a new tab page, each tab page has its own diffs
cmdmod.cmod_tab = 0;
if (win_split(0, (diff_flags & DIFF_VERTICAL) ? WSP_VERT : 0) != FAIL) {
// Pretend it was a ":split fname" command
eap->cmdidx = CMD_split;
eap->arg = tmp_new;
do_exedit(eap, old_curwin);
// check that split worked and editing tmp_new
if ((curwin != old_curwin) && win_valid(old_curwin)) {
// Set 'diff', 'scrollbind' on and 'wrap' off.
diff_win_options(curwin, true);
diff_win_options(old_curwin, true);
if (newname != NULL) {
// do a ":file filename.new" on the patched buffer
eap->arg = newname;
ex_file(eap);
// Do filetype detection with the new name.
if (augroup_exists("filetypedetect")) {
do_cmdline_cmd(":doau filetypedetect BufRead");
}
}
}
}
}
theend:
if (tmp_orig != NULL) {
os_remove(tmp_orig);
}
xfree(tmp_orig);
if (tmp_new != NULL) {
os_remove(tmp_new);
}
xfree(tmp_new);
xfree(newname);
xfree(buf);
#ifdef UNIX
xfree(fullname);
#endif
xfree(esc_name);
}
/// Split the window and edit another file, setting options to show the diffs.
///
/// @param eap
void ex_diffsplit(exarg_T *eap)
{
win_T *old_curwin = curwin;
bufref_T old_curbuf;
set_bufref(&old_curbuf, curbuf);
// Need to compute w_fraction when no redraw happened yet.
validate_cursor(curwin);
set_fraction(curwin);
// don't use a new tab page, each tab page has its own diffs
cmdmod.cmod_tab = 0;
if (win_split(0, (diff_flags & DIFF_VERTICAL) ? WSP_VERT : 0) == FAIL) {
return;
}
// Pretend it was a ":split fname" command
eap->cmdidx = CMD_split;
curwin->w_p_diff = true;
do_exedit(eap, old_curwin);
if (curwin == old_curwin) { // split didn't work
return;
}
// Set 'diff', 'scrollbind' on and 'wrap' off.
diff_win_options(curwin, true);
if (win_valid(old_curwin)) {
diff_win_options(old_curwin, true);
if (bufref_valid(&old_curbuf)) {
// Move the cursor position to that of the old window.
curwin->w_cursor.lnum = diff_get_corresponding_line(old_curbuf.br_buf,
old_curwin->w_cursor.lnum);
}
}
// Now that lines are folded scroll to show the cursor at the same
// relative position.
scroll_to_fraction(curwin, curwin->w_height);
}
// Set options to show diffs for the current window.
void ex_diffthis(exarg_T *eap)
{
// Set 'diff', 'scrollbind' on and 'wrap' off.
diff_win_options(curwin, true);
}
static void set_diff_option(win_T *wp, bool value)
{
win_T *old_curwin = curwin;
curwin = wp;
curbuf = curwin->w_buffer;
curbuf->b_ro_locked++;
set_option_value_give_err(kOptDiff, BOOLEAN_OPTVAL(value), OPT_LOCAL);
curbuf->b_ro_locked--;
curwin = old_curwin;
curbuf = curwin->w_buffer;
}
/// Set options in window "wp" for diff mode.
///
/// @param addbuf Add buffer to diff.
void diff_win_options(win_T *wp, bool addbuf)
{
win_T *old_curwin = curwin;
// close the manually opened folds
curwin = wp;
newFoldLevel();
curwin = old_curwin;
// Use 'scrollbind' and 'cursorbind' when available
if (!wp->w_p_diff) {
wp->w_p_scb_save = wp->w_p_scb;
}
wp->w_p_scb = true;
if (!wp->w_p_diff) {
wp->w_p_crb_save = wp->w_p_crb;
}
wp->w_p_crb = true;
if (!(diff_flags & DIFF_FOLLOWWRAP)) {
if (!wp->w_p_diff) {
wp->w_p_wrap_save = wp->w_p_wrap;
}
wp->w_p_wrap = false;
wp->w_skipcol = 0;
}
if (!wp->w_p_diff) {
if (wp->w_p_diff_saved) {
free_string_option(wp->w_p_fdm_save);
}
wp->w_p_fdm_save = xstrdup(wp->w_p_fdm);
}
set_option_direct_for(kOptFoldmethod, STATIC_CSTR_AS_OPTVAL("diff"), OPT_LOCAL, 0, kOptReqWin,
wp);
if (!wp->w_p_diff) {
wp->w_p_fen_save = wp->w_p_fen;
wp->w_p_fdl_save = wp->w_p_fdl;
if (wp->w_p_diff_saved) {
free_string_option(wp->w_p_fdc_save);
}
wp->w_p_fdc_save = xstrdup(wp->w_p_fdc);
}
free_string_option(wp->w_p_fdc);
wp->w_p_fdc = xstrdup("2");
assert(diff_foldcolumn >= 0 && diff_foldcolumn <= 9);
snprintf(wp->w_p_fdc, strlen(wp->w_p_fdc) + 1, "%d", diff_foldcolumn);
wp->w_p_fen = true;
wp->w_p_fdl = 0;
foldUpdateAll(wp);
// make sure topline is not halfway through a fold
changed_window_setting(wp);
if (vim_strchr(p_sbo, 'h') == NULL) {
do_cmdline_cmd("set sbo+=hor");
}
// Save the current values, to be restored in ex_diffoff().
wp->w_p_diff_saved = true;
set_diff_option(wp, true);
if (addbuf) {
diff_buf_add(wp->w_buffer);
}
redraw_later(wp, UPD_NOT_VALID);
}
/// Set options not to show diffs. For the current window or all windows.
/// Only in the current tab page.
///
/// @param eap
void ex_diffoff(exarg_T *eap)
{
bool diffwin = false;
FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
if (eap->forceit ? wp->w_p_diff : (wp == curwin)) {
// Set 'diff' off. If option values were saved in
// diff_win_options(), restore the ones whose settings seem to have
// been left over from diff mode.
set_diff_option(wp, false);
if (wp->w_p_diff_saved) {
if (wp->w_p_scb) {
wp->w_p_scb = wp->w_p_scb_save;
}
if (wp->w_p_crb) {
wp->w_p_crb = wp->w_p_crb_save;
}
if (!(diff_flags & DIFF_FOLLOWWRAP)) {
if (!wp->w_p_wrap && wp->w_p_wrap_save) {
wp->w_p_wrap = true;
wp->w_leftcol = 0;
}
}
free_string_option(wp->w_p_fdm);
wp->w_p_fdm = xstrdup(*wp->w_p_fdm_save ? wp->w_p_fdm_save : "manual");
free_string_option(wp->w_p_fdc);
wp->w_p_fdc = xstrdup(*wp->w_p_fdc_save ? wp->w_p_fdc_save : "0");
if (wp->w_p_fdl == 0) {
wp->w_p_fdl = wp->w_p_fdl_save;
}
// Only restore 'foldenable' when 'foldmethod' is not
// "manual", otherwise we continue to show the diff folds.
if (wp->w_p_fen) {
wp->w_p_fen = foldmethodIsManual(wp) ? false : wp->w_p_fen_save;
}
foldUpdateAll(wp);
}
// remove filler lines
wp->w_topfill = 0;
// make sure topline is not halfway a fold and cursor is
// invalidated
changed_window_setting(wp);
// Note: 'sbo' is not restored, it's a global option.
diff_buf_adjust(wp);
}
diffwin |= wp->w_p_diff;
}
// Also remove hidden buffers from the list.
if (eap->forceit) {
diff_buf_clear();
}
if (!diffwin) {
diff_need_update = false;
curtab->tp_diff_invalid = false;
curtab->tp_diff_update = false;
diff_clear(curtab);
}
// Remove "hor" from 'scrollopt' if there are no diff windows left.
if (!diffwin && (vim_strchr(p_sbo, 'h') != NULL)) {
do_cmdline_cmd("set sbo-=hor");
}
}
static bool extract_hunk_internal(diffout_T *dout, diffhunk_T *hunk, int *line_idx)
{
bool eof = *line_idx >= dout->dout_ga.ga_len;
if (!eof) {
*hunk = ((diffhunk_T *)dout->dout_ga.ga_data)[(*line_idx)++];
}
return eof;
}
// Extract hunk by parsing the diff output from file and calculate the diffstyle.
static bool extract_hunk(FILE *fd, diffhunk_T *hunk, diffstyle_T *diffstyle)
{
while (true) {
char line[LBUFLEN]; // only need to hold the diff line
if (vim_fgets(line, LBUFLEN, fd)) {
return true; // end of file
}
if (*diffstyle == DIFF_NONE) {
// Determine diff style.
// ed like diff looks like this:
// {first}[,{last}]c{first}[,{last}]
// {first}a{first}[,{last}]
// {first}[,{last}]d{first}
//
// unified diff looks like this:
// --- file1 2018-03-20 13:23:35.783153140 +0100
// +++ file2 2018-03-20 13:23:41.183156066 +0100
// @@ -1,3 +1,5 @@
if (isdigit((uint8_t)(*line))) {
*diffstyle = DIFF_ED;
} else if ((strncmp(line, "@@ ", 3) == 0)) {
*diffstyle = DIFF_UNIFIED;
} else if ((strncmp(line, "--- ", 4) == 0)
&& (vim_fgets(line, LBUFLEN, fd) == 0)
&& (strncmp(line, "+++ ", 4) == 0)
&& (vim_fgets(line, LBUFLEN, fd) == 0)
&& (strncmp(line, "@@ ", 3) == 0)) {
*diffstyle = DIFF_UNIFIED;
} else {
// Format not recognized yet, skip over this line. Cygwin diff
// may put a warning at the start of the file.
continue;
}
}
if (*diffstyle == DIFF_ED) {
if (!isdigit((uint8_t)(*line))) {
continue; // not the start of a diff block
}
if (parse_diff_ed(line, hunk) == FAIL) {
continue;
}
} else {
assert(*diffstyle == DIFF_UNIFIED);
if (strncmp(line, "@@ ", 3) != 0) {
continue; // not the start of a diff block
}
if (parse_diff_unified(line, hunk) == FAIL) {
continue;
}
}
// Successfully parsed diff output, can return
return false;
}
}
static void process_hunk(diff_T **dpp, diff_T **dprevp, int idx_orig, int idx_new, diffhunk_T *hunk,
bool *notsetp)
{
diff_T *dp = *dpp;
diff_T *dprev = *dprevp;
// Go over blocks before the change, for which orig and new are equal.
// Copy blocks from orig to new.
while (dp != NULL
&& hunk->lnum_orig > dp->df_lnum[idx_orig] + dp->df_count[idx_orig]) {
if (*notsetp) {
diff_copy_entry(dprev, dp, idx_orig, idx_new);
}
dprev = dp;
dp = dp->df_next;
*notsetp = true;
}
if ((dp != NULL)
&& (hunk->lnum_orig <= dp->df_lnum[idx_orig] + dp->df_count[idx_orig])
&& (hunk->lnum_orig + hunk->count_orig >= dp->df_lnum[idx_orig])) {
// New block overlaps with existing block(s).
// First find last block that overlaps.
diff_T *dpl;
for (dpl = dp; dpl->df_next != NULL; dpl = dpl->df_next) {
if (hunk->lnum_orig + hunk->count_orig < dpl->df_next->df_lnum[idx_orig]) {
break;
}
}
// If the newly found block starts before the old one, set the
// start back a number of lines.
linenr_T off = dp->df_lnum[idx_orig] - hunk->lnum_orig;
if (off > 0) {
for (int i = idx_orig; i < idx_new; i++) {
if (curtab->tp_diffbuf[i] != NULL) {
dp->df_lnum[i] -= off;
}
}
dp->df_lnum[idx_new] = hunk->lnum_new;
dp->df_count[idx_new] = (linenr_T)hunk->count_new;
} else if (*notsetp) {
// new block inside existing one, adjust new block
dp->df_lnum[idx_new] = hunk->lnum_new + off;
dp->df_count[idx_new] = (linenr_T)hunk->count_new - off;
} else {
// second overlap of new block with existing block
dp->df_count[idx_new] += (linenr_T)hunk->count_new - (linenr_T)hunk->count_orig
+ dpl->df_lnum[idx_orig] +
dpl->df_count[idx_orig]
- (dp->df_lnum[idx_orig] +
dp->df_count[idx_orig]);
}
// Adjust the size of the block to include all the lines to the
// end of the existing block or the new diff, whatever ends last.
off = (hunk->lnum_orig + (linenr_T)hunk->count_orig)
- (dpl->df_lnum[idx_orig] + dpl->df_count[idx_orig]);
if (off < 0) {
// new change ends in existing block, adjust the end if not
// done already
if (*notsetp) {
dp->df_count[idx_new] += -off;
}
off = 0;
}
for (int i = idx_orig; i < idx_new; i++) {
if (curtab->tp_diffbuf[i] != NULL) {
dp->df_count[i] = dpl->df_lnum[i] + dpl->df_count[i]
- dp->df_lnum[i] + off;
}
}
// Delete the diff blocks that have been merged into one.
diff_T *dn = dp->df_next;
dp->df_next = dpl->df_next;
while (dn != dp->df_next) {
dpl = dn->df_next;
xfree(dn);
dn = dpl;
}
} else {
// Allocate a new diffblock.
dp = diff_alloc_new(curtab, dprev, dp);
dp->df_lnum[idx_orig] = hunk->lnum_orig;
dp->df_count[idx_orig] = (linenr_T)hunk->count_orig;
dp->df_lnum[idx_new] = hunk->lnum_new;
dp->df_count[idx_new] = (linenr_T)hunk->count_new;
// Set values for other buffers, these must be equal to the
// original buffer, otherwise there would have been a change
// already.
for (int i = idx_orig + 1; i < idx_new; i++) {
if (curtab->tp_diffbuf[i] != NULL) {
diff_copy_entry(dprev, dp, idx_orig, i);
}
}
}
*notsetp = false; // "*dp" has been set
*dpp = dp;
*dprevp = dprev;
}
/// Read the diff output and add each entry to the diff list.
///
/// @param idx_orig idx of original file
/// @param idx_new idx of new file
/// @dout diff output
static void diff_read(int idx_orig, int idx_new, diffio_T *dio)
{
FILE *fd = NULL;
int line_idx = 0;
diff_T *dprev = NULL;
diff_T *dp = curtab->tp_first_diff;
diffout_T *dout = &dio->dio_diff;
bool notset = true; // block "*dp" not set yet
diffstyle_T diffstyle = DIFF_NONE;
if (!dio->dio_internal) {
fd = os_fopen(dout->dout_fname, "r");
if (fd == NULL) {
emsg(_("E98: Cannot read diff output"));
return;
}
}
while (true) {
diffhunk_T hunk = { 0 };
bool eof = dio->dio_internal
? extract_hunk_internal(dout, &hunk, &line_idx)
: extract_hunk(fd, &hunk, &diffstyle);
if (eof) {
break;
}
process_hunk(&dp, &dprev, idx_orig, idx_new, &hunk, ¬set);
}
// for remaining diff blocks orig and new are equal
while (dp != NULL) {
if (notset) {
diff_copy_entry(dprev, dp, idx_orig, idx_new);
}
dprev = dp;
dp = dp->df_next;
notset = true;
}
if (fd != NULL) {
fclose(fd);
}
}
/// Copy an entry at "dp" from "idx_orig" to "idx_new".
///
/// @param dprev
/// @param dp
/// @param idx_orig
/// @param idx_new
static void diff_copy_entry(diff_T *dprev, diff_T *dp, int idx_orig, int idx_new)
{
linenr_T off;
if (dprev == NULL) {
off = 0;
} else {
off = (dprev->df_lnum[idx_orig] + dprev->df_count[idx_orig])
- (dprev->df_lnum[idx_new] + dprev->df_count[idx_new]);
}
dp->df_lnum[idx_new] = dp->df_lnum[idx_orig] - off;
dp->df_count[idx_new] = dp->df_count[idx_orig];
}
/// Clear the list of diffblocks for tab page "tp".
///
/// @param tp
void diff_clear(tabpage_T *tp)
FUNC_ATTR_NONNULL_ALL
{
diff_T *next_p;
for (diff_T *p = tp->tp_first_diff; p != NULL; p = next_p) {
next_p = p->df_next;
xfree(p);
}
tp->tp_first_diff = NULL;
}
/// Return true if the options are set to use diff linematch.
bool diff_linematch(diff_T *dp)
{
if (!(diff_flags & DIFF_LINEMATCH)) {
return false;
}
// are there more than three diff buffers?
int tsize = 0;
for (int i = 0; i < DB_COUNT; i++) {
if (curtab->tp_diffbuf[i] != NULL) {
// for the rare case (bug?) that the count of a diff block is negative, do
// not run the algorithm because this will try to allocate a negative
// amount of space and crash
if (dp->df_count[i] < 0) {
return false;
}
tsize += dp->df_count[i];
}
}
// avoid allocating a huge array because it will lag
return tsize <= linematch_lines;
}
static int get_max_diff_length(const diff_T *dp)
{
int maxlength = 0;
for (int k = 0; k < DB_COUNT; k++) {
if (curtab->tp_diffbuf[k] != NULL) {
if (dp->df_count[k] > maxlength) {
maxlength = dp->df_count[k];
}
}
}
return maxlength;
}
static void find_top_diff_block(diff_T **thistopdiff, diff_T **nextblockblock, int fromidx,
int topline)
{
diff_T *topdiff = NULL;
diff_T *localtopdiff = NULL;
int topdiffchange = 0;
for (topdiff = curtab->tp_first_diff; topdiff != NULL; topdiff = topdiff->df_next) {
// set the top of the current overlapping diff block set as we
// iterate through all of the sets of overlapping diff blocks
if (!localtopdiff || topdiffchange) {
localtopdiff = topdiff;
topdiffchange = 0;
}
// check if the fromwin topline is matched by the current diff. if so, set it to the top of the diff block
if (topline >= topdiff->df_lnum[fromidx] && topline <=
(topdiff->df_lnum[fromidx] + topdiff->df_count[fromidx])) {
// this line is inside the current diff block, so we will save the
// top block of the set of blocks to refer to later
if ((*thistopdiff) == NULL) {
(*thistopdiff) = localtopdiff;
}
}
// check if the next set of overlapping diff blocks is next
if (!(topdiff->df_next && (topdiff->df_next->df_lnum[fromidx] ==
(topdiff->df_lnum[fromidx] + topdiff->df_count[fromidx])))) {
// mark that the next diff block is belongs to a different set of
// overlapping diff blocks
topdiffchange = 1;
// if we already have found that the line number is inside a diff block,
// set the marker of the next block and finish the iteration
if (*thistopdiff) {
(*nextblockblock) = topdiff->df_next;
break;
}
}
}
}
static void count_filler_lines_and_topline(int *curlinenum_to, int *linesfiller,
const diff_T *thistopdiff, const int toidx,
int virtual_lines_passed)
{
const diff_T *curdif = thistopdiff;
int ch_virtual_lines = 0;
bool isfiller = false;
while (virtual_lines_passed > 0) {
if (ch_virtual_lines) {
virtual_lines_passed--;
ch_virtual_lines--;
if (!isfiller) {
(*curlinenum_to)++;
} else {
(*linesfiller)++;
}
} else {
(*linesfiller) = 0;
ch_virtual_lines = get_max_diff_length(curdif);
isfiller = (curdif->df_count[toidx] ? false : true);
if (isfiller) {
while (curdif && curdif->df_next && curdif->df_lnum[toidx] ==
curdif->df_next->df_lnum[toidx]
&& curdif->df_next->df_count[toidx] == 0) {
curdif = curdif->df_next;
ch_virtual_lines += get_max_diff_length(curdif);
}
}
if (curdif) {
curdif = curdif->df_next;
}
}
}
}
static void calculate_topfill_and_topline(const int fromidx, const int toidx, const
int from_topline, const int from_topfill, int *topfill,
linenr_T *topline)
{
// 1. find the position from the top of the diff block, and the start
// of the next diff block
diff_T *thistopdiff = NULL;
diff_T *nextblockblock = NULL;
int virtual_lines_passed = 0;
find_top_diff_block(&thistopdiff, &nextblockblock, fromidx, from_topline);
// count the virtual lines that have been passed
diff_T *curdif = thistopdiff;
while (curdif && (curdif->df_lnum[fromidx] + curdif->df_count[fromidx])
<= from_topline) {
virtual_lines_passed += get_max_diff_length(curdif);
curdif = curdif->df_next;
}
if (curdif != nextblockblock) {
virtual_lines_passed += from_topline - curdif->df_lnum[fromidx];
}
virtual_lines_passed -= from_topfill;
// count the same amount of virtual lines in the toidx buffer
int curlinenum_to = thistopdiff->df_lnum[toidx];
int linesfiller = 0;
count_filler_lines_and_topline(&curlinenum_to, &linesfiller,
thistopdiff, toidx, virtual_lines_passed);
// count the number of filler lines that would normally be above this line
int maxfiller = 0;
for (diff_T *dpfillertest = thistopdiff; dpfillertest != NULL;
dpfillertest = dpfillertest->df_next) {
if (dpfillertest->df_lnum[toidx] == curlinenum_to) {
while (dpfillertest && dpfillertest->df_lnum[toidx] == curlinenum_to) {
maxfiller += dpfillertest->df_count[toidx] ? 0 : get_max_diff_length(dpfillertest);
dpfillertest = dpfillertest->df_next;
}
break;
}
}
(*topfill) = maxfiller - linesfiller;
(*topline) = curlinenum_to;
}
static int linematched_filler_lines(diff_T *dp, int idx, linenr_T lnum, int *linestatus)
{
int filler_lines_d1 = 0;
while (dp && dp->df_next
&& lnum == (dp->df_lnum[idx] + dp->df_count[idx])
&& dp->df_next->df_lnum[idx] == lnum) {
if (dp->df_count[idx] == 0) {
filler_lines_d1 += get_max_diff_length(dp);
}
dp = dp->df_next;
}
if (dp->df_count[idx] == 0) {
filler_lines_d1 += get_max_diff_length(dp);
}
if (lnum < dp->df_lnum[idx] + dp->df_count[idx]) {
int j = 0;
for (int i = 0; i < DB_COUNT; i++) {
if (curtab->tp_diffbuf[i] != NULL) {
if (dp->df_count[i]) {
j++;
}
}
// is this an added line or a changed line?
if (linestatus) {
(*linestatus) = (j == 1) ? -2 : -1;
}
}
}
return filler_lines_d1;
}
// Apply results from the linematch algorithm and apply to 'dp' by splitting it into multiple
// adjacent diff blocks.
static void apply_linematch_results(diff_T *dp, size_t decisions_length, const int *decisions)
{
// get the start line number here in each diff buffer, and then increment
int line_numbers[DB_COUNT];
int outputmap[DB_COUNT];
size_t ndiffs = 0;
for (int i = 0; i < DB_COUNT; i++) {
if (curtab->tp_diffbuf[i] != NULL) {
line_numbers[i] = dp->df_lnum[i];
dp->df_count[i] = 0;
// Keep track of the index of the diff buffer we are using here.
// We will use this to write the output of the algorithm to
// diff_T structs at the correct indexes
outputmap[ndiffs] = i;
ndiffs++;
}
}
// write the diffs starting with the current diff block
diff_T *dp_s = dp;
for (size_t i = 0; i < decisions_length; i++) {
// Don't allocate on first iter since we can reuse the initial diffblock
if (i != 0 && (decisions[i - 1] != decisions[i])) {
// create new sub diff blocks to segment the original diff block which we
// further divided by running the linematch algorithm
dp_s = diff_alloc_new(curtab, dp_s, dp_s->df_next);
dp_s->is_linematched = true;
for (int j = 0; j < DB_COUNT; j++) {
if (curtab->tp_diffbuf[j] != NULL) {
dp_s->df_lnum[j] = line_numbers[j];
dp_s->df_count[j] = 0;
}
}
}
for (size_t j = 0; j < ndiffs; j++) {
if (decisions[i] & (1 << j)) {
// will need to use the map here
dp_s->df_count[outputmap[j]]++;
line_numbers[outputmap[j]]++;
}
}
}
dp->is_linematched = true;
}
static void run_linematch_algorithm(diff_T *dp)
{
// define buffers for diff algorithm
mmfile_t diffbufs_mm[DB_COUNT];
const char *diffbufs[DB_COUNT];
int diff_length[DB_COUNT];
size_t ndiffs = 0;
for (int i = 0; i < DB_COUNT; i++) {
if (curtab->tp_diffbuf[i] != NULL) {
// write the contents of the entire buffer to
// diffbufs_mm[diffbuffers_count]
diff_write_buffer(curtab->tp_diffbuf[i], &diffbufs_mm[ndiffs],
dp->df_lnum[i], dp->df_lnum[i] + dp->df_count[i] - 1);
// we want to get the char* to the diff buffer that was just written
// we add it to the array of char*, diffbufs
diffbufs[ndiffs] = diffbufs_mm[ndiffs].ptr;
// keep track of the length of this diff block to pass it to the linematch
// algorithm
diff_length[ndiffs] = dp->df_count[i];
// increment the amount of diff buffers we are passing to the algorithm
ndiffs++;
}
}
// we will get the output of the linematch algorithm in the format of an array
// of integers (*decisions) and the length of that array (decisions_length)
int *decisions = NULL;
const bool iwhite = (diff_flags & (DIFF_IWHITEALL | DIFF_IWHITE)) > 0;
size_t decisions_length = linematch_nbuffers(diffbufs, diff_length, ndiffs, &decisions, iwhite);
for (size_t i = 0; i < ndiffs; i++) {
XFREE_CLEAR(diffbufs_mm[i].ptr);
}
apply_linematch_results(dp, decisions_length, decisions);
xfree(decisions);
}
/// Check diff status for line "lnum" in buffer "buf":
///
/// Returns 0 for nothing special
/// Returns -1 for a line that should be highlighted as changed.
/// Returns -2 for a line that should be highlighted as added/deleted.
/// Returns > 0 for inserting that many filler lines above it (never happens
/// when 'diffopt' doesn't contain "filler").
/// This should only be used for windows where 'diff' is set.
///
/// @param wp
/// @param lnum
/// @param[out] linestatus
///
/// @return diff status.
int diff_check_with_linestatus(win_T *wp, linenr_T lnum, int *linestatus)
{
buf_T *buf = wp->w_buffer;
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
// no diffs at all
if ((curtab->tp_first_diff == NULL) || !wp->w_p_diff) {
return 0;
}
// safety check: "lnum" must be a buffer line
if ((lnum < 1) || (lnum > buf->b_ml.ml_line_count + 1)) {
return 0;
}
int idx = diff_buf_idx(buf, curtab); // index in tp_diffbuf[] for this buffer
if (idx == DB_COUNT) {
// no diffs for buffer "buf"
return 0;
}
// A closed fold never has filler lines.
if (hasFolding(wp, lnum, NULL, NULL)) {
return 0;
}
// search for a change that includes "lnum" in the list of diffblocks.
diff_T *dp;
for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (lnum <= dp->df_lnum[idx] + dp->df_count[idx]) {
break;
}
}
if ((dp == NULL) || (lnum < dp->df_lnum[idx])) {
return 0;
}
// Don't run linematch when lnum is offscreen.
// Useful for scrollbind calculations which need to count all the filler lines
// above the screen.
if (lnum >= wp->w_topline && lnum < wp->w_botline
&& !dp->is_linematched && diff_linematch(dp)) {
run_linematch_algorithm(dp);
}
if (dp->is_linematched) {
return linematched_filler_lines(dp, idx, lnum, linestatus);
}
if (lnum < dp->df_lnum[idx] + dp->df_count[idx]) {
bool zero = false;
// Changed or inserted line. If the other buffers have a count of
// zero, the lines were inserted. If the other buffers have the same
// count, check if the lines are identical.
bool cmp = false;
for (int i = 0; i < DB_COUNT; i++) {
if ((i != idx) && (curtab->tp_diffbuf[i] != NULL)) {
if (dp->df_count[i] == 0) {
zero = true;
} else {
if (dp->df_count[i] != dp->df_count[idx]) {
// nr of lines changed.
return -1;
}
cmp = true;
}
}
}
if (cmp) {
// Compare all lines. If they are equal the lines were inserted
// in some buffers, deleted in others, but not changed.
for (int i = 0; i < DB_COUNT; i++) {
if ((i != idx)
&& (curtab->tp_diffbuf[i] != NULL)
&& (dp->df_count[i] != 0)) {
if (!diff_equal_entry(dp, idx, i)) {
return -1;
}
}
}
}
// If there is no buffer with zero lines then there is no difference
// any longer. Happens when making a change (or undo) that removes
// the difference. Can't remove the entry here, we might be halfway
// through updating the window. Just report the text as unchanged.
// Other windows might still show the change though.
if (!zero) {
return 0;
}
return -2;
}
// If 'diffopt' doesn't contain "filler", return 0.
if (!(diff_flags & DIFF_FILLER)) {
return 0;
}
// Insert filler lines above the line just below the change. Will return
// 0 when this buf had the max count.
int maxcount = get_max_diff_length(dp);
return maxcount - dp->df_count[idx];
}
/// See diff_check_with_linestatus
int diff_check(win_T *wp, linenr_T lnum)
{
return diff_check_with_linestatus(wp, lnum, NULL);
}
/// Compare two entries in diff "dp" and return true if they are equal.
///
/// @param dp diff
/// @param idx1 first entry in diff "dp"
/// @param idx2 second entry in diff "dp"
///
/// @return true if two entries are equal.
static bool diff_equal_entry(diff_T *dp, int idx1, int idx2)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ARG(1)
{
if (dp->df_count[idx1] != dp->df_count[idx2]) {
return false;
}
if (diff_check_sanity(curtab, dp) == FAIL) {
return false;
}
for (int i = 0; i < dp->df_count[idx1]; i++) {
char *line = xstrdup(ml_get_buf(curtab->tp_diffbuf[idx1], dp->df_lnum[idx1] + i));
int cmp = diff_cmp(line, ml_get_buf(curtab->tp_diffbuf[idx2], dp->df_lnum[idx2] + i));
xfree(line);
if (cmp != 0) {
return false;
}
}
return true;
}
// Compare the characters at "p1" and "p2". If they are equal (possibly
// ignoring case) return true and set "len" to the number of bytes.
static bool diff_equal_char(const char *const p1, const char *const p2, int *const len)
{
const int l = utfc_ptr2len(p1);
if (l != utfc_ptr2len(p2)) {
return false;
}
if (l > 1) {
if (strncmp(p1, p2, (size_t)l) != 0
&& (!(diff_flags & DIFF_ICASE)
|| utf_fold(utf_ptr2char(p1)) != utf_fold(utf_ptr2char(p2)))) {
return false;
}
*len = l;
} else {
if ((*p1 != *p2)
&& (!(diff_flags & DIFF_ICASE)
|| TOLOWER_LOC((uint8_t)(*p1)) != TOLOWER_LOC((uint8_t)(*p2)))) {
return false;
}
*len = 1;
}
return true;
}
/// Compare strings "s1" and "s2" according to 'diffopt'.
/// Return non-zero when they are different.
///
/// @param s1 The first string
/// @param s2 The second string
///
/// @return on-zero if the two strings are different.
static int diff_cmp(char *s1, char *s2)
{
if ((diff_flags & DIFF_IBLANK)
&& (*skipwhite(s1) == NUL || *skipwhite(s2) == NUL)) {
return 0;
}
if ((diff_flags & (DIFF_ICASE | ALL_WHITE_DIFF)) == 0) {
return strcmp(s1, s2);
}
if ((diff_flags & DIFF_ICASE) && !(diff_flags & ALL_WHITE_DIFF)) {
return mb_stricmp(s1, s2);
}
char *p1 = s1;
char *p2 = s2;
// Ignore white space changes and possibly ignore case.
while (*p1 != NUL && *p2 != NUL) {
if (((diff_flags & DIFF_IWHITE)
&& ascii_iswhite(*p1) && ascii_iswhite(*p2))
|| ((diff_flags & DIFF_IWHITEALL)
&& (ascii_iswhite(*p1) || ascii_iswhite(*p2)))) {
p1 = skipwhite(p1);
p2 = skipwhite(p2);
} else {
int l;
if (!diff_equal_char(p1, p2, &l)) {
break;
}
p1 += l;
p2 += l;
}
}
// Ignore trailing white space.
p1 = skipwhite(p1);
p2 = skipwhite(p2);
if ((*p1 != NUL) || (*p2 != NUL)) {
return 1;
}
return 0;
}
/// Set the topline of "towin" to match the position in "fromwin", so that they
/// show the same diff'ed lines.
///
/// @param fromwin
/// @param towin
void diff_set_topline(win_T *fromwin, win_T *towin)
{
buf_T *frombuf = fromwin->w_buffer;
linenr_T lnum = fromwin->w_topline;
int fromidx = diff_buf_idx(frombuf, curtab);
if (fromidx == DB_COUNT) {
// safety check
return;
}
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
towin->w_topfill = 0;
// search for a change that includes "lnum" in the list of diffblocks.
diff_T *dp;
for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (lnum <= dp->df_lnum[fromidx] + dp->df_count[fromidx]) {
break;
}
}
if (dp == NULL) {
// After last change, compute topline relative to end of file; no
// filler lines.
towin->w_topline = towin->w_buffer->b_ml.ml_line_count
- (frombuf->b_ml.ml_line_count - lnum);
} else {
// Find index for "towin".
int toidx = diff_buf_idx(towin->w_buffer, curtab);
if (toidx == DB_COUNT) {
// safety check
return;
}
towin->w_topline = lnum + (dp->df_lnum[toidx] - dp->df_lnum[fromidx]);
if (lnum >= dp->df_lnum[fromidx]) {
if (dp->is_linematched) {
calculate_topfill_and_topline(fromidx, toidx, fromwin->w_topline,
fromwin->w_topfill, &towin->w_topfill, &towin->w_topline);
} else {
// Inside a change: compute filler lines. With three or more
// buffers we need to know the largest count.
linenr_T max_count = 0;
for (int i = 0; i < DB_COUNT; i++) {
if ((curtab->tp_diffbuf[i] != NULL) && (max_count < dp->df_count[i])) {
max_count = dp->df_count[i];
}
}
if (dp->df_count[toidx] == dp->df_count[fromidx]) {
// same number of lines: use same filler count
towin->w_topfill = fromwin->w_topfill;
} else if (dp->df_count[toidx] > dp->df_count[fromidx]) {
if (lnum == dp->df_lnum[fromidx] + dp->df_count[fromidx]) {
// more lines in towin and fromwin doesn't show diff
// lines, only filler lines
if (max_count - fromwin->w_topfill >= dp->df_count[toidx]) {
// towin also only shows filler lines
towin->w_topline = dp->df_lnum[toidx] + dp->df_count[toidx];
towin->w_topfill = fromwin->w_topfill;
} else {
// towin still has some diff lines to show
towin->w_topline = dp->df_lnum[toidx]
+ max_count - fromwin->w_topfill;
}
}
} else if (towin->w_topline >= dp->df_lnum[toidx]
+ dp->df_count[toidx]) {
// less lines in towin and no diff lines to show: compute
// filler lines
towin->w_topline = dp->df_lnum[toidx] + dp->df_count[toidx];
if (diff_flags & DIFF_FILLER) {
if (lnum == dp->df_lnum[fromidx] + dp->df_count[fromidx]) {
// fromwin is also out of diff lines
towin->w_topfill = fromwin->w_topfill;
} else {
// fromwin has some diff lines
towin->w_topfill = dp->df_lnum[fromidx] + max_count - lnum;
}
}
}
}
}
}
// safety check (if diff info gets outdated strange things may happen)
towin->w_botfill = false;
if (towin->w_topline > towin->w_buffer->b_ml.ml_line_count) {
towin->w_topline = towin->w_buffer->b_ml.ml_line_count;
towin->w_botfill = true;
}
if (towin->w_topline < 1) {
towin->w_topline = 1;
towin->w_topfill = 0;
}
// When w_topline changes need to recompute w_botline and cursor position
invalidate_botline(towin);
changed_line_abv_curs_win(towin);
check_topfill(towin, false);
hasFolding(towin, towin->w_topline, &towin->w_topline, NULL);
}
/// This is called when 'diffopt' is changed.
///
/// @return
int diffopt_changed(void)
{
int diff_context_new = 6;
int linematch_lines_new = 0;
int diff_flags_new = 0;
int diff_foldcolumn_new = 2;
int diff_algorithm_new = 0;
int diff_indent_heuristic = 0;
char *p = p_dip;
while (*p != NUL) {
// Note: Keep this in sync with p_dip_values
if (strncmp(p, "filler", 6) == 0) {
p += 6;
diff_flags_new |= DIFF_FILLER;
} else if ((strncmp(p, "context:", 8) == 0) && ascii_isdigit(p[8])) {
p += 8;
diff_context_new = getdigits_int(&p, false, diff_context_new);
} else if (strncmp(p, "iblank", 6) == 0) {
p += 6;
diff_flags_new |= DIFF_IBLANK;
} else if (strncmp(p, "icase", 5) == 0) {
p += 5;
diff_flags_new |= DIFF_ICASE;
} else if (strncmp(p, "iwhiteall", 9) == 0) {
p += 9;
diff_flags_new |= DIFF_IWHITEALL;
} else if (strncmp(p, "iwhiteeol", 9) == 0) {
p += 9;
diff_flags_new |= DIFF_IWHITEEOL;
} else if (strncmp(p, "iwhite", 6) == 0) {
p += 6;
diff_flags_new |= DIFF_IWHITE;
} else if (strncmp(p, "horizontal", 10) == 0) {
p += 10;
diff_flags_new |= DIFF_HORIZONTAL;
} else if (strncmp(p, "vertical", 8) == 0) {
p += 8;
diff_flags_new |= DIFF_VERTICAL;
} else if ((strncmp(p, "foldcolumn:", 11) == 0) && ascii_isdigit(p[11])) {
p += 11;
diff_foldcolumn_new = getdigits_int(&p, false, diff_foldcolumn_new);
} else if (strncmp(p, "hiddenoff", 9) == 0) {
p += 9;
diff_flags_new |= DIFF_HIDDEN_OFF;
} else if (strncmp(p, "closeoff", 8) == 0) {
p += 8;
diff_flags_new |= DIFF_CLOSE_OFF;
} else if (strncmp(p, "followwrap", 10) == 0) {
p += 10;
diff_flags_new |= DIFF_FOLLOWWRAP;
} else if (strncmp(p, "indent-heuristic", 16) == 0) {
p += 16;
diff_indent_heuristic = XDF_INDENT_HEURISTIC;
} else if (strncmp(p, "internal", 8) == 0) {
p += 8;
diff_flags_new |= DIFF_INTERNAL;
} else if (strncmp(p, "algorithm:", 10) == 0) {
// Note: Keep this in sync with p_dip_algorithm_values.
p += 10;
if (strncmp(p, "myers", 5) == 0) {
p += 5;
diff_algorithm_new = 0;
} else if (strncmp(p, "minimal", 7) == 0) {
p += 7;
diff_algorithm_new = XDF_NEED_MINIMAL;
} else if (strncmp(p, "patience", 8) == 0) {
p += 8;
diff_algorithm_new = XDF_PATIENCE_DIFF;
} else if (strncmp(p, "histogram", 9) == 0) {
p += 9;
diff_algorithm_new = XDF_HISTOGRAM_DIFF;
} else {
return FAIL;
}
} else if ((strncmp(p, "linematch:", 10) == 0) && ascii_isdigit(p[10])) {
p += 10;
linematch_lines_new = getdigits_int(&p, false, linematch_lines_new);
diff_flags_new |= DIFF_LINEMATCH;
}
if ((*p != ',') && (*p != NUL)) {
return FAIL;
}
if (*p == ',') {
p++;
}
}
diff_algorithm_new |= diff_indent_heuristic;
// Can't have both "horizontal" and "vertical".
if ((diff_flags_new & DIFF_HORIZONTAL) && (diff_flags_new & DIFF_VERTICAL)) {
return FAIL;
}
// If flags were added or removed, or the algorithm was changed, need to
// update the diff.
if (diff_flags != diff_flags_new || diff_algorithm != diff_algorithm_new) {
FOR_ALL_TABS(tp) {
tp->tp_diff_invalid = true;
}
}
diff_flags = diff_flags_new;
diff_context = diff_context_new == 0 ? 1 : diff_context_new;
linematch_lines = linematch_lines_new;
diff_foldcolumn = diff_foldcolumn_new;
diff_algorithm = diff_algorithm_new;
diff_redraw(true);
// recompute the scroll binding with the new option value, may
// remove or add filler lines
check_scrollbind(0, 0);
return OK;
}
/// Check that "diffopt" contains "horizontal".
bool diffopt_horizontal(void)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT
{
return (diff_flags & DIFF_HORIZONTAL) != 0;
}
// Return true if 'diffopt' contains "hiddenoff".
bool diffopt_hiddenoff(void)
FUNC_ATTR_PURE
{
return (diff_flags & DIFF_HIDDEN_OFF) != 0;
}
// Return true if 'diffopt' contains "closeoff".
bool diffopt_closeoff(void)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT
{
return (diff_flags & DIFF_CLOSE_OFF) != 0;
}
// Return true if 'diffopt' contains "filler".
bool diffopt_filler(void)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT
{
return (diff_flags & DIFF_FILLER) != 0;
}
/// Find the difference within a changed line.
///
/// @param wp window whose current buffer to check
/// @param lnum line number to check within the buffer
/// @param startp first char of the change
/// @param endp last char of the change
///
/// @return true if the line was added, no other buffer has it.
bool diff_find_change(win_T *wp, linenr_T lnum, int *startp, int *endp)
FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL
{
// Make a copy of the line, the next ml_get() will invalidate it.
char *line_org = xstrdup(ml_get_buf(wp->w_buffer, lnum));
int idx = diff_buf_idx(wp->w_buffer, curtab);
if (idx == DB_COUNT) {
// cannot happen
xfree(line_org);
return false;
}
// search for a change that includes "lnum" in the list of diffblocks.
diff_T *dp;
for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (lnum <= dp->df_lnum[idx] + dp->df_count[idx]) {
break;
}
}
if (dp != NULL && dp->is_linematched) {
while (dp && dp->df_next
&& lnum == dp->df_count[idx] + dp->df_lnum[idx]
&& dp->df_next->df_lnum[idx] == lnum) {
dp = dp->df_next;
}
}
if ((dp == NULL) || (diff_check_sanity(curtab, dp) == FAIL)) {
xfree(line_org);
return false;
}
int si_org;
int si_new;
int ei_org;
int ei_new;
bool added = true;
linenr_T off = lnum - dp->df_lnum[idx];
for (int i = 0; i < DB_COUNT; i++) {
if ((curtab->tp_diffbuf[i] != NULL) && (i != idx)) {
// Skip lines that are not in the other change (filler lines).
if (off >= dp->df_count[i]) {
continue;
}
added = false;
char *line_new = ml_get_buf(curtab->tp_diffbuf[i], dp->df_lnum[i] + off);
// Search for start of difference
si_org = si_new = 0;
while (line_org[si_org] != NUL) {
if (((diff_flags & DIFF_IWHITE)
&& ascii_iswhite(line_org[si_org])
&& ascii_iswhite(line_new[si_new]))
|| ((diff_flags & DIFF_IWHITEALL)
&& (ascii_iswhite(line_org[si_org])
|| ascii_iswhite(line_new[si_new])))) {
si_org = (int)(skipwhite(line_org + si_org) - line_org);
si_new = (int)(skipwhite(line_new + si_new) - line_new);
} else {
int l;
if (!diff_equal_char(line_org + si_org, line_new + si_new, &l)) {
break;
}
si_org += l;
si_new += l;
}
}
// Move back to first byte of character in both lines (may
// have "nn^" in line_org and "n^ in line_new).
si_org -= utf_head_off(line_org, line_org + si_org);
si_new -= utf_head_off(line_new, line_new + si_new);
*startp = MIN(*startp, si_org);
// Search for end of difference, if any.
if ((line_org[si_org] != NUL) || (line_new[si_new] != NUL)) {
ei_org = (int)strlen(line_org);
ei_new = (int)strlen(line_new);
while (ei_org >= *startp
&& ei_new >= si_new
&& ei_org >= 0
&& ei_new >= 0) {
if (((diff_flags & DIFF_IWHITE)
&& ascii_iswhite(line_org[ei_org])
&& ascii_iswhite(line_new[ei_new]))
|| ((diff_flags & DIFF_IWHITEALL)
&& (ascii_iswhite(line_org[ei_org])
|| ascii_iswhite(line_new[ei_new])))) {
while (ei_org >= *startp && ascii_iswhite(line_org[ei_org])) {
ei_org--;
}
while (ei_new >= si_new && ascii_iswhite(line_new[ei_new])) {
ei_new--;
}
} else {
const char *p1 = line_org + ei_org;
const char *p2 = line_new + ei_new;
p1 -= utf_head_off(line_org, p1);
p2 -= utf_head_off(line_new, p2);
int l;
if (!diff_equal_char(p1, p2, &l)) {
break;
}
ei_org -= l;
ei_new -= l;
}
}
*endp = MAX(*endp, ei_org);
}
}
}
xfree(line_org);
return added;
}
/// Check that line "lnum" is not close to a diff block, this line should
/// be in a fold.
///
/// @param wp window containing the buffer to check
/// @param lnum line number to check within the buffer
///
/// @return false if there are no diff blocks at all in this window.
bool diff_infold(win_T *wp, linenr_T lnum)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ARG(1)
{
// Return if 'diff' isn't set.
if (!wp->w_p_diff) {
return false;
}
int idx = -1;
bool other = false;
for (int i = 0; i < DB_COUNT; i++) {
if (curtab->tp_diffbuf[i] == wp->w_buffer) {
idx = i;
} else if (curtab->tp_diffbuf[i] != NULL) {
other = true;
}
}
// return here if there are no diffs in the window
if ((idx == -1) || !other) {
return false;
}
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
// Return if there are no diff blocks. All lines will be folded.
if (curtab->tp_first_diff == NULL) {
return true;
}
for (diff_T *dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
// If this change is below the line there can't be any further match.
if (dp->df_lnum[idx] - diff_context > lnum) {
break;
}
// If this change ends before the line we have a match.
if (dp->df_lnum[idx] + dp->df_count[idx] + diff_context > lnum) {
return false;
}
}
return true;
}
/// "dp" and "do" commands.
void nv_diffgetput(bool put, size_t count)
{
if (bt_prompt(curbuf)) {
vim_beep(BO_OPER);
return;
}
exarg_T ea;
char buf[30];
if (count == 0) {
ea.arg = "";
} else {
vim_snprintf(buf, sizeof(buf), "%zu", count);
ea.arg = buf;
}
if (put) {
ea.cmdidx = CMD_diffput;
} else {
ea.cmdidx = CMD_diffget;
}
ea.addr_count = 0;
ea.line1 = curwin->w_cursor.lnum;
ea.line2 = curwin->w_cursor.lnum;
ex_diffgetput(&ea);
}
/// Return true if "diff" appears in the list of diff blocks of the current tab.
static bool valid_diff(diff_T *diff)
{
for (diff_T *dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (dp == diff) {
return true;
}
}
return false;
}
/// ":diffget" and ":diffput"
///
/// @param eap
void ex_diffgetput(exarg_T *eap)
{
int idx_other;
// Find the current buffer in the list of diff buffers.
int idx_cur = diff_buf_idx(curbuf, curtab);
if (idx_cur == DB_COUNT) {
emsg(_("E99: Current buffer is not in diff mode"));
return;
}
if (*eap->arg == NUL) {
bool found_not_ma = false;
// No argument: Find the other buffer in the list of diff buffers.
for (idx_other = 0; idx_other < DB_COUNT; idx_other++) {
if ((curtab->tp_diffbuf[idx_other] != curbuf)
&& (curtab->tp_diffbuf[idx_other] != NULL)) {
if ((eap->cmdidx != CMD_diffput)
|| MODIFIABLE(curtab->tp_diffbuf[idx_other])) {
break;
}
found_not_ma = true;
}
}
if (idx_other == DB_COUNT) {
if (found_not_ma) {
emsg(_("E793: No other buffer in diff mode is modifiable"));
} else {
emsg(_("E100: No other buffer in diff mode"));
}
return;
}
// Check that there isn't a third buffer in the list
for (int i = idx_other + 1; i < DB_COUNT; i++) {
if ((curtab->tp_diffbuf[i] != curbuf)
&& (curtab->tp_diffbuf[i] != NULL)
&& ((eap->cmdidx != CMD_diffput)
|| MODIFIABLE(curtab->tp_diffbuf[i]))) {
emsg(_("E101: More than two buffers in diff mode, don't know "
"which one to use"));
return;
}
}
} else {
// Buffer number or pattern given. Ignore trailing white space.
char *p = eap->arg + strlen(eap->arg);
while (p > eap->arg && ascii_iswhite(p[-1])) {
p--;
}
int i;
for (i = 0; ascii_isdigit(eap->arg[i]) && eap->arg + i < p; i++) {}
if (eap->arg + i == p) {
// digits only
i = (int)atol(eap->arg);
} else {
i = buflist_findpat(eap->arg, p, false, true, false);
if (i < 0) {
// error message already given
return;
}
}
buf_T *buf = buflist_findnr(i);
if (buf == NULL) {
semsg(_("E102: Can't find buffer \"%s\""), eap->arg);
return;
}
if (buf == curbuf) {
// nothing to do
return;
}
idx_other = diff_buf_idx(buf, curtab);
if (idx_other == DB_COUNT) {
semsg(_("E103: Buffer \"%s\" is not in diff mode"), eap->arg);
return;
}
}
diff_busy = true;
// When no range given include the line above or below the cursor.
if (eap->addr_count == 0) {
// Make it possible that ":diffget" on the last line gets line below
// the cursor line when there is no difference above the cursor.
if ((eap->cmdidx == CMD_diffget)
&& (eap->line1 == curbuf->b_ml.ml_line_count)
&& (diff_check(curwin, eap->line1) == 0)
&& ((eap->line1 == 1) || (diff_check(curwin, eap->line1 - 1) == 0))) {
eap->line2++;
} else if (eap->line1 > 0) {
eap->line1--;
}
}
aco_save_T aco;
if (eap->cmdidx != CMD_diffget) {
// Need to make the other buffer the current buffer to be able to make
// changes in it.
// Set curwin/curbuf to buf and save a few things.
aucmd_prepbuf(&aco, curtab->tp_diffbuf[idx_other]);
}
const int idx_from = eap->cmdidx == CMD_diffget ? idx_other : idx_cur;
const int idx_to = eap->cmdidx == CMD_diffget ? idx_cur : idx_other;
// May give the warning for a changed buffer here, which can trigger the
// FileChangedRO autocommand, which may do nasty things and mess
// everything up.
if (!curbuf->b_changed) {
change_warning(curbuf, 0);
if (diff_buf_idx(curbuf, curtab) != idx_to) {
emsg(_("E787: Buffer changed unexpectedly"));
goto theend;
}
}
diffgetput(eap->addr_count, idx_cur, idx_from, idx_to, eap->line1, eap->line2);
// restore curwin/curbuf and a few other things
if (eap->cmdidx != CMD_diffget) {
// Syncing undo only works for the current buffer, but we change
// another buffer. Sync undo if the command was typed. This isn't
// 100% right when ":diffput" is used in a function or mapping.
if (KeyTyped) {
u_sync(false);
}
aucmd_restbuf(&aco);
}
theend:
diff_busy = false;
if (diff_need_update) {
ex_diffupdate(NULL);
}
// Check that the cursor is on a valid character and update its
// position. When there were filler lines the topline has become
// invalid.
check_cursor(curwin);
changed_line_abv_curs();
if (diff_need_update) {
// redraw already done by ex_diffupdate()
diff_need_update = false;
} else {
// Also need to redraw the other buffers.
diff_redraw(false);
apply_autocmds(EVENT_DIFFUPDATED, NULL, NULL, false, curbuf);
}
}
/// Apply diffget/diffput to buffers and diffblocks
///
/// @param idx_cur index of "curbuf" before aucmd_prepbuf() in the list of diff buffers
/// @param idx_from index of the buffer to read from in the list of diff buffers
/// @param idx_to index of the buffer to modify in the list of diff buffers
static void diffgetput(const int addr_count, const int idx_cur, const int idx_from,
const int idx_to, const linenr_T line1, const linenr_T line2)
{
linenr_T off = 0;
diff_T *dprev = NULL;
for (diff_T *dp = curtab->tp_first_diff; dp != NULL;) {
if (!addr_count) {
// handle the case with adjacent diff blocks
while (dp->is_linematched
&& dp->df_next
&& dp->df_next->df_lnum[idx_cur] == dp->df_lnum[idx_cur] + dp->df_count[idx_cur]
&& dp->df_next->df_lnum[idx_cur] == line1 + off + 1) {
dprev = dp;
dp = dp->df_next;
}
}
if (dp->df_lnum[idx_cur] > line2 + off) {
// past the range that was specified
break;
}
diff_T dfree = { 0 };
bool did_free = false;
linenr_T lnum = dp->df_lnum[idx_to];
linenr_T count = dp->df_count[idx_to];
if ((dp->df_lnum[idx_cur] + dp->df_count[idx_cur] > line1 + off)
&& (u_save(lnum - 1, lnum + count) != FAIL)) {
// Inside the specified range and saving for undo worked.
linenr_T start_skip = 0;
linenr_T end_skip = 0;
if (addr_count > 0) {
// A range was specified: check if lines need to be skipped.
start_skip = line1 + off - dp->df_lnum[idx_cur];
if (start_skip > 0) {
// range starts below start of current diff block
if (start_skip > count) {
lnum += count;
count = 0;
} else {
count -= start_skip;
lnum += start_skip;
}
} else {
start_skip = 0;
}
end_skip = dp->df_lnum[idx_cur] + dp->df_count[idx_cur] - 1
- (line2 + off);
if (end_skip > 0) {
// range ends above end of current/from diff block
if (idx_cur == idx_from) {
// :diffput
count = MIN(count, dp->df_count[idx_cur] - start_skip - end_skip);
} else {
// :diffget
count -= end_skip;
end_skip = MAX(dp->df_count[idx_from] - start_skip - count, 0);
}
} else {
end_skip = 0;
}
}
bool buf_empty = buf_is_empty(curbuf);
int added = 0;
for (int i = 0; i < count; i++) {
// remember deleting the last line of the buffer
buf_empty = curbuf->b_ml.ml_line_count == 1;
if (ml_delete(lnum, false) == OK) {
added--;
}
}
for (int i = 0; i < dp->df_count[idx_from] - start_skip - end_skip; i++) {
linenr_T nr = dp->df_lnum[idx_from] + start_skip + i;
if (nr > curtab->tp_diffbuf[idx_from]->b_ml.ml_line_count) {
break;
}
char *p = xstrdup(ml_get_buf(curtab->tp_diffbuf[idx_from], nr));
ml_append(lnum + i - 1, p, 0, false);
xfree(p);
added++;
if (buf_empty && (curbuf->b_ml.ml_line_count == 2)) {
// Added the first line into an empty buffer, need to
// delete the dummy empty line.
// This has a side effect of incrementing curbuf->deleted_bytes,
// which results in inaccurate reporting of the byte count of
// previous contents in buffer-update events.
buf_empty = false;
ml_delete(2, false);
}
}
linenr_T new_count = dp->df_count[idx_to] + added;
dp->df_count[idx_to] = new_count;
if ((start_skip == 0) && (end_skip == 0)) {
// Check if there are any other buffers and if the diff is
// equal in them.
int i;
for (i = 0; i < DB_COUNT; i++) {
if ((curtab->tp_diffbuf[i] != NULL)
&& (i != idx_from)
&& (i != idx_to)
&& !diff_equal_entry(dp, idx_from, i)) {
break;
}
}
if (i == DB_COUNT) {
// delete the diff entry, the buffers are now equal here
dfree = *dp;
did_free = true;
dp = diff_free(curtab, dprev, dp);
}
}
if (added != 0) {
// Adjust marks. This will change the following entries!
mark_adjust(lnum, lnum + count - 1, MAXLNUM, added, kExtmarkNOOP);
if (curwin->w_cursor.lnum >= lnum) {
// Adjust the cursor position if it's in/after the changed
// lines.
if (curwin->w_cursor.lnum >= lnum + count) {
curwin->w_cursor.lnum += added;
} else if (added < 0) {
curwin->w_cursor.lnum = lnum;
}
}
}
extmark_adjust(curbuf, lnum, lnum + count - 1, MAXLNUM, added, kExtmarkUndo);
changed_lines(curbuf, lnum, 0, lnum + count, added, true);
if (did_free) {
// Diff is deleted, update folds in other windows.
diff_fold_update(&dfree, idx_to);
}
// mark_adjust() may have made "dp" invalid. We don't know where
// to continue then, bail out.
if (added != 0 && !valid_diff(dp)) {
break;
}
if (!did_free) {
// mark_adjust() may have changed the count in a wrong way
dp->df_count[idx_to] = new_count;
}
// When changing the current buffer, keep track of line numbers
if (idx_cur == idx_to) {
off += added;
}
}
// If before the range or not deleted, go to next diff.
if (!did_free) {
dprev = dp;
dp = dp->df_next;
}
}
}
/// Update folds for all diff buffers for entry "dp".
///
/// Skip buffer with index "skip_idx".
/// When there are no diffs, all folds are removed.
///
/// @param dp
/// @param skip_idx
static void diff_fold_update(diff_T *dp, int skip_idx)
{
FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
for (int i = 0; i < DB_COUNT; i++) {
if ((curtab->tp_diffbuf[i] == wp->w_buffer) && (i != skip_idx)) {
foldUpdate(wp, dp->df_lnum[i], dp->df_lnum[i] + dp->df_count[i]);
}
}
}
}
/// Checks that the buffer is in diff-mode.
///
/// @param buf buffer to check.
bool diff_mode_buf(buf_T *buf)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ARG(1)
{
FOR_ALL_TABS(tp) {
if (diff_buf_idx(buf, tp) != DB_COUNT) {
return true;
}
}
return false;
}
/// Move "count" times in direction "dir" to the next diff block.
///
/// @param dir
/// @param count
///
/// @return FAIL if there isn't such a diff block.
int diff_move_to(int dir, int count)
{
linenr_T lnum = curwin->w_cursor.lnum;
int idx = diff_buf_idx(curbuf, curtab);
if ((idx == DB_COUNT) || (curtab->tp_first_diff == NULL)) {
return FAIL;
}
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
if (curtab->tp_first_diff == NULL) {
// no diffs today
return FAIL;
}
while (--count >= 0) {
// Check if already before first diff.
if ((dir == BACKWARD) && (lnum <= curtab->tp_first_diff->df_lnum[idx])) {
break;
}
diff_T *dp;
for (dp = curtab->tp_first_diff;; dp = dp->df_next) {
if (dp == NULL) {
break;
}
if (((dir == FORWARD) && (lnum < dp->df_lnum[idx]))
|| ((dir == BACKWARD)
&& ((dp->df_next == NULL)
|| (lnum <= dp->df_next->df_lnum[idx])))) {
lnum = dp->df_lnum[idx];
break;
}
}
}
// don't end up past the end of the file
lnum = MIN(lnum, curbuf->b_ml.ml_line_count);
// When the cursor didn't move at all we fail.
if (lnum == curwin->w_cursor.lnum) {
return FAIL;
}
setpcmark();
curwin->w_cursor.lnum = lnum;
curwin->w_cursor.col = 0;
return OK;
}
/// Return the line number in the current window that is closest to "lnum1" in
/// "buf1" in diff mode.
static linenr_T diff_get_corresponding_line_int(buf_T *buf1, linenr_T lnum1)
{
linenr_T baseline = 0;
int idx1 = diff_buf_idx(buf1, curtab);
int idx2 = diff_buf_idx(curbuf, curtab);
if ((idx1 == DB_COUNT)
|| (idx2 == DB_COUNT)
|| (curtab->tp_first_diff == NULL)) {
return lnum1;
}
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
if (curtab->tp_first_diff == NULL) {
// no diffs today
return lnum1;
}
for (diff_T *dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (dp->df_lnum[idx1] > lnum1) {
return lnum1 - baseline;
}
if ((dp->df_lnum[idx1] + dp->df_count[idx1]) > lnum1) {
// Inside the diffblock
baseline = lnum1 - dp->df_lnum[idx1];
baseline = MIN(baseline, dp->df_count[idx2]);
return dp->df_lnum[idx2] + baseline;
}
if ((dp->df_lnum[idx1] == lnum1)
&& (dp->df_count[idx1] == 0)
&& (dp->df_lnum[idx2] <= curwin->w_cursor.lnum)
&& ((dp->df_lnum[idx2] + dp->df_count[idx2])
> curwin->w_cursor.lnum)) {
// Special case: if the cursor is just after a zero-count
// block (i.e. all filler) and the target cursor is already
// inside the corresponding block, leave the target cursor
// unmoved. This makes repeated CTRL-W W operations work
// as expected.
return curwin->w_cursor.lnum;
}
baseline = (dp->df_lnum[idx1] + dp->df_count[idx1])
- (dp->df_lnum[idx2] + dp->df_count[idx2]);
}
// If we get here then the cursor is after the last diff
return lnum1 - baseline;
}
/// Finds the corresponding line in a diff.
///
/// @param buf1
/// @param lnum1
///
/// @return The corresponding line.
linenr_T diff_get_corresponding_line(buf_T *buf1, linenr_T lnum1)
{
linenr_T lnum = diff_get_corresponding_line_int(buf1, lnum1);
// don't end up past the end of the file
return MIN(lnum, curbuf->b_ml.ml_line_count);
}
/// For line "lnum" in the current window find the equivalent lnum in window
/// "wp", compensating for inserted/deleted lines.
linenr_T diff_lnum_win(linenr_T lnum, win_T *wp)
{
diff_T *dp;
int idx = diff_buf_idx(curbuf, curtab);
if (idx == DB_COUNT) {
// safety check
return 0;
}
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
// search for a change that includes "lnum" in the list of diffblocks.
for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (lnum <= dp->df_lnum[idx] + dp->df_count[idx]) {
break;
}
}
// When after the last change, compute relative to the last line number.
if (dp == NULL) {
return wp->w_buffer->b_ml.ml_line_count
- (curbuf->b_ml.ml_line_count - lnum);
}
// Find index for "wp".
int i = diff_buf_idx(wp->w_buffer, curtab);
if (i == DB_COUNT) {
// safety check
return 0;
}
linenr_T n = lnum + (dp->df_lnum[i] - dp->df_lnum[idx]);
return MIN(n, dp->df_lnum[i] + dp->df_count[i]);
}
/// Handle an ED style diff line.
///
/// @return FAIL if the line does not contain diff info.
static int parse_diff_ed(char *line, diffhunk_T *hunk)
{
int l1, l2;
// The line must be one of three formats:
// change: {first}[,{last}]c{first}[,{last}]
// append: {first}a{first}[,{last}]
// delete: {first}[,{last}]d{first}
char *p = line;
linenr_T f1 = getdigits_int32(&p, true, 0);
if (*p == ',') {
p++;
l1 = getdigits_int(&p, true, 0);
} else {
l1 = f1;
}
if (*p != 'a' && *p != 'c' && *p != 'd') {
return FAIL; // invalid diff format
}
int difftype = (uint8_t)(*p++);
int f2 = getdigits_int(&p, true, 0);
if (*p == ',') {
p++;
l2 = getdigits_int(&p, true, 0);
} else {
l2 = f2;
}
if (l1 < f1 || l2 < f2) {
return FAIL;
}
if (difftype == 'a') {
hunk->lnum_orig = f1 + 1;
hunk->count_orig = 0;
} else {
hunk->lnum_orig = f1;
hunk->count_orig = l1 - f1 + 1;
}
if (difftype == 'd') {
hunk->lnum_new = (linenr_T)f2 + 1;
hunk->count_new = 0;
} else {
hunk->lnum_new = (linenr_T)f2;
hunk->count_new = l2 - f2 + 1;
}
return OK;
}
/// Parses unified diff with zero(!) context lines.
/// Return FAIL if there is no diff information in "line".
static int parse_diff_unified(char *line, diffhunk_T *hunk)
{
// Parse unified diff hunk header:
// @@ -oldline,oldcount +newline,newcount @@
char *p = line;
if (*p++ == '@' && *p++ == '@' && *p++ == ' ' && *p++ == '-') {
int oldcount;
linenr_T newline;
int newcount;
linenr_T oldline = getdigits_int32(&p, true, 0);
if (*p == ',') {
p++;
oldcount = getdigits_int(&p, true, 0);
} else {
oldcount = 1;
}
if (*p++ == ' ' && *p++ == '+') {
newline = getdigits_int(&p, true, 0);
if (*p == ',') {
p++;
newcount = getdigits_int(&p, true, 0);
} else {
newcount = 1;
}
} else {
return FAIL; // invalid diff format
}
if (oldcount == 0) {
oldline += 1;
}
if (newcount == 0) {
newline += 1;
}
if (newline == 0) {
newline = 1;
}
hunk->lnum_orig = oldline;
hunk->count_orig = oldcount;
hunk->lnum_new = newline;
hunk->count_new = newcount;
return OK;
}
return FAIL;
}
/// Callback function for the xdl_diff() function.
/// Stores the diff output in a grow array.
static int xdiff_out(int start_a, int count_a, int start_b, int count_b, void *priv)
{
diffout_T *dout = (diffout_T *)priv;
GA_APPEND(diffhunk_T, &(dout->dout_ga), ((diffhunk_T){
.lnum_orig = (linenr_T)start_a + 1,
.count_orig = count_a,
.lnum_new = (linenr_T)start_b + 1,
.count_new = count_b,
}));
return 0;
}