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add-patch.c
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add-patch.c
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#include "cache.h"
#include "add-interactive.h"
#include "strbuf.h"
#include "run-command.h"
#include "strvec.h"
#include "pathspec.h"
#include "color.h"
#include "diff.h"
#include "compat/terminal.h"
#include "prompt.h"
enum prompt_mode_type {
PROMPT_MODE_CHANGE = 0, PROMPT_DELETION, PROMPT_ADDITION, PROMPT_HUNK,
PROMPT_MODE_MAX, /* must be last */
};
struct patch_mode {
/*
* The magic constant 4 is chosen such that all patch modes
* provide enough space for three command-line arguments followed by a
* trailing `NULL`.
*/
const char *diff_cmd[4], *apply_args[4], *apply_check_args[4];
unsigned is_reverse:1, index_only:1, apply_for_checkout:1;
const char *prompt_mode[PROMPT_MODE_MAX];
const char *edit_hunk_hint, *help_patch_text;
};
static struct patch_mode patch_mode_add = {
.diff_cmd = { "diff-files", NULL },
.apply_args = { "--cached", NULL },
.apply_check_args = { "--cached", NULL },
.prompt_mode = {
N_("Stage mode change [y,n,q,a,d%s,?]? "),
N_("Stage deletion [y,n,q,a,d%s,?]? "),
N_("Stage addition [y,n,q,a,d%s,?]? "),
N_("Stage this hunk [y,n,q,a,d%s,?]? ")
},
.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
"will immediately be marked for staging."),
.help_patch_text =
N_("y - stage this hunk\n"
"n - do not stage this hunk\n"
"q - quit; do not stage this hunk or any of the remaining "
"ones\n"
"a - stage this hunk and all later hunks in the file\n"
"d - do not stage this hunk or any of the later hunks in "
"the file\n")
};
static struct patch_mode patch_mode_stash = {
.diff_cmd = { "diff-index", "HEAD", NULL },
.apply_args = { "--cached", NULL },
.apply_check_args = { "--cached", NULL },
.prompt_mode = {
N_("Stash mode change [y,n,q,a,d%s,?]? "),
N_("Stash deletion [y,n,q,a,d%s,?]? "),
N_("Stash addition [y,n,q,a,d%s,?]? "),
N_("Stash this hunk [y,n,q,a,d%s,?]? "),
},
.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
"will immediately be marked for stashing."),
.help_patch_text =
N_("y - stash this hunk\n"
"n - do not stash this hunk\n"
"q - quit; do not stash this hunk or any of the remaining "
"ones\n"
"a - stash this hunk and all later hunks in the file\n"
"d - do not stash this hunk or any of the later hunks in "
"the file\n"),
};
static struct patch_mode patch_mode_reset_head = {
.diff_cmd = { "diff-index", "--cached", NULL },
.apply_args = { "-R", "--cached", NULL },
.apply_check_args = { "-R", "--cached", NULL },
.is_reverse = 1,
.index_only = 1,
.prompt_mode = {
N_("Unstage mode change [y,n,q,a,d%s,?]? "),
N_("Unstage deletion [y,n,q,a,d%s,?]? "),
N_("Unstage addition [y,n,q,a,d%s,?]? "),
N_("Unstage this hunk [y,n,q,a,d%s,?]? "),
},
.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
"will immediately be marked for unstaging."),
.help_patch_text =
N_("y - unstage this hunk\n"
"n - do not unstage this hunk\n"
"q - quit; do not unstage this hunk or any of the remaining "
"ones\n"
"a - unstage this hunk and all later hunks in the file\n"
"d - do not unstage this hunk or any of the later hunks in "
"the file\n"),
};
static struct patch_mode patch_mode_reset_nothead = {
.diff_cmd = { "diff-index", "-R", "--cached", NULL },
.apply_args = { "--cached", NULL },
.apply_check_args = { "--cached", NULL },
.index_only = 1,
.prompt_mode = {
N_("Apply mode change to index [y,n,q,a,d%s,?]? "),
N_("Apply deletion to index [y,n,q,a,d%s,?]? "),
N_("Apply addition to index [y,n,q,a,d%s,?]? "),
N_("Apply this hunk to index [y,n,q,a,d%s,?]? "),
},
.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
"will immediately be marked for applying."),
.help_patch_text =
N_("y - apply this hunk to index\n"
"n - do not apply this hunk to index\n"
"q - quit; do not apply this hunk or any of the remaining "
"ones\n"
"a - apply this hunk and all later hunks in the file\n"
"d - do not apply this hunk or any of the later hunks in "
"the file\n"),
};
static struct patch_mode patch_mode_checkout_index = {
.diff_cmd = { "diff-files", NULL },
.apply_args = { "-R", NULL },
.apply_check_args = { "-R", NULL },
.is_reverse = 1,
.prompt_mode = {
N_("Discard mode change from worktree [y,n,q,a,d%s,?]? "),
N_("Discard deletion from worktree [y,n,q,a,d%s,?]? "),
N_("Discard addition from worktree [y,n,q,a,d%s,?]? "),
N_("Discard this hunk from worktree [y,n,q,a,d%s,?]? "),
},
.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
"will immediately be marked for discarding."),
.help_patch_text =
N_("y - discard this hunk from worktree\n"
"n - do not discard this hunk from worktree\n"
"q - quit; do not discard this hunk or any of the remaining "
"ones\n"
"a - discard this hunk and all later hunks in the file\n"
"d - do not discard this hunk or any of the later hunks in "
"the file\n"),
};
static struct patch_mode patch_mode_checkout_head = {
.diff_cmd = { "diff-index", NULL },
.apply_for_checkout = 1,
.apply_check_args = { "-R", NULL },
.is_reverse = 1,
.prompt_mode = {
N_("Discard mode change from index and worktree [y,n,q,a,d%s,?]? "),
N_("Discard deletion from index and worktree [y,n,q,a,d%s,?]? "),
N_("Discard addition from index and worktree [y,n,q,a,d%s,?]? "),
N_("Discard this hunk from index and worktree [y,n,q,a,d%s,?]? "),
},
.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
"will immediately be marked for discarding."),
.help_patch_text =
N_("y - discard this hunk from index and worktree\n"
"n - do not discard this hunk from index and worktree\n"
"q - quit; do not discard this hunk or any of the remaining "
"ones\n"
"a - discard this hunk and all later hunks in the file\n"
"d - do not discard this hunk or any of the later hunks in "
"the file\n"),
};
static struct patch_mode patch_mode_checkout_nothead = {
.diff_cmd = { "diff-index", "-R", NULL },
.apply_for_checkout = 1,
.apply_check_args = { NULL },
.prompt_mode = {
N_("Apply mode change to index and worktree [y,n,q,a,d%s,?]? "),
N_("Apply deletion to index and worktree [y,n,q,a,d%s,?]? "),
N_("Apply addition to index and worktree [y,n,q,a,d%s,?]? "),
N_("Apply this hunk to index and worktree [y,n,q,a,d%s,?]? "),
},
.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
"will immediately be marked for applying."),
.help_patch_text =
N_("y - apply this hunk to index and worktree\n"
"n - do not apply this hunk to index and worktree\n"
"q - quit; do not apply this hunk or any of the remaining "
"ones\n"
"a - apply this hunk and all later hunks in the file\n"
"d - do not apply this hunk or any of the later hunks in "
"the file\n"),
};
static struct patch_mode patch_mode_worktree_head = {
.diff_cmd = { "diff-index", NULL },
.apply_args = { "-R", NULL },
.apply_check_args = { "-R", NULL },
.is_reverse = 1,
.prompt_mode = {
N_("Discard mode change from index and worktree [y,n,q,a,d%s,?]? "),
N_("Discard deletion from index and worktree [y,n,q,a,d%s,?]? "),
N_("Discard addition from index and worktree [y,n,q,a,d%s,?]? "),
N_("Discard this hunk from index and worktree [y,n,q,a,d%s,?]? "),
},
.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
"will immediately be marked for discarding."),
.help_patch_text =
N_("y - discard this hunk from worktree\n"
"n - do not discard this hunk from worktree\n"
"q - quit; do not discard this hunk or any of the remaining "
"ones\n"
"a - discard this hunk and all later hunks in the file\n"
"d - do not discard this hunk or any of the later hunks in "
"the file\n"),
};
static struct patch_mode patch_mode_worktree_nothead = {
.diff_cmd = { "diff-index", "-R", NULL },
.apply_args = { NULL },
.apply_check_args = { NULL },
.prompt_mode = {
N_("Apply mode change to index and worktree [y,n,q,a,d%s,?]? "),
N_("Apply deletion to index and worktree [y,n,q,a,d%s,?]? "),
N_("Apply addition to index and worktree [y,n,q,a,d%s,?]? "),
N_("Apply this hunk to index and worktree [y,n,q,a,d%s,?]? "),
},
.edit_hunk_hint = N_("If the patch applies cleanly, the edited hunk "
"will immediately be marked for applying."),
.help_patch_text =
N_("y - apply this hunk to worktree\n"
"n - do not apply this hunk to worktree\n"
"q - quit; do not apply this hunk or any of the remaining "
"ones\n"
"a - apply this hunk and all later hunks in the file\n"
"d - do not apply this hunk or any of the later hunks in "
"the file\n"),
};
struct hunk_header {
unsigned long old_offset, old_count, new_offset, new_count;
/*
* Start/end offsets to the extra text after the second `@@` in the
* hunk header, e.g. the function signature. This is expected to
* include the newline.
*/
size_t extra_start, extra_end, colored_extra_start, colored_extra_end;
};
struct hunk {
size_t start, end, colored_start, colored_end, splittable_into;
ssize_t delta;
enum { UNDECIDED_HUNK = 0, SKIP_HUNK, USE_HUNK } use;
struct hunk_header header;
};
struct add_p_state {
struct add_i_state s;
struct strbuf answer, buf;
/* parsed diff */
struct strbuf plain, colored;
struct file_diff {
struct hunk head;
struct hunk *hunk;
size_t hunk_nr, hunk_alloc;
unsigned deleted:1, added:1, mode_change:1,binary:1;
} *file_diff;
size_t file_diff_nr;
/* patch mode */
struct patch_mode *mode;
const char *revision;
};
static void add_p_state_clear(struct add_p_state *s)
{
size_t i;
strbuf_release(&s->answer);
strbuf_release(&s->buf);
strbuf_release(&s->plain);
strbuf_release(&s->colored);
for (i = 0; i < s->file_diff_nr; i++)
free(s->file_diff[i].hunk);
free(s->file_diff);
clear_add_i_state(&s->s);
}
static void err(struct add_p_state *s, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
fputs(s->s.error_color, stderr);
vfprintf(stderr, fmt, args);
fputs(s->s.reset_color, stderr);
fputc('\n', stderr);
va_end(args);
}
static void setup_child_process(struct add_p_state *s,
struct child_process *cp, ...)
{
va_list ap;
const char *arg;
va_start(ap, cp);
while ((arg = va_arg(ap, const char *)))
strvec_push(&cp->args, arg);
va_end(ap);
cp->git_cmd = 1;
strvec_pushf(&cp->env_array,
INDEX_ENVIRONMENT "=%s", s->s.r->index_file);
}
static int parse_range(const char **p,
unsigned long *offset, unsigned long *count)
{
char *pend;
*offset = strtoul(*p, &pend, 10);
if (pend == *p)
return -1;
if (*pend != ',') {
*count = 1;
*p = pend;
return 0;
}
*count = strtoul(pend + 1, (char **)p, 10);
return *p == pend + 1 ? -1 : 0;
}
static int parse_hunk_header(struct add_p_state *s, struct hunk *hunk)
{
struct hunk_header *header = &hunk->header;
const char *line = s->plain.buf + hunk->start, *p = line;
char *eol = memchr(p, '\n', s->plain.len - hunk->start);
if (!eol)
eol = s->plain.buf + s->plain.len;
if (!skip_prefix(p, "@@ -", &p) ||
parse_range(&p, &header->old_offset, &header->old_count) < 0 ||
!skip_prefix(p, " +", &p) ||
parse_range(&p, &header->new_offset, &header->new_count) < 0 ||
!skip_prefix(p, " @@", &p))
return error(_("could not parse hunk header '%.*s'"),
(int)(eol - line), line);
hunk->start = eol - s->plain.buf + (*eol == '\n');
header->extra_start = p - s->plain.buf;
header->extra_end = hunk->start;
if (!s->colored.len) {
header->colored_extra_start = header->colored_extra_end = 0;
return 0;
}
/* Now find the extra text in the colored diff */
line = s->colored.buf + hunk->colored_start;
eol = memchr(line, '\n', s->colored.len - hunk->colored_start);
if (!eol)
eol = s->colored.buf + s->colored.len;
p = memmem(line, eol - line, "@@ -", 4);
if (!p)
return error(_("could not parse colored hunk header '%.*s'"),
(int)(eol - line), line);
p = memmem(p + 4, eol - p - 4, " @@", 3);
if (!p)
return error(_("could not parse colored hunk header '%.*s'"),
(int)(eol - line), line);
hunk->colored_start = eol - s->colored.buf + (*eol == '\n');
header->colored_extra_start = p + 3 - s->colored.buf;
header->colored_extra_end = hunk->colored_start;
return 0;
}
static int is_octal(const char *p, size_t len)
{
if (!len)
return 0;
while (len--)
if (*p < '0' || *(p++) > '7')
return 0;
return 1;
}
static int parse_diff(struct add_p_state *s, const struct pathspec *ps)
{
struct strvec args = STRVEC_INIT;
const char *diff_algorithm = s->s.interactive_diff_algorithm;
struct strbuf *plain = &s->plain, *colored = NULL;
struct child_process cp = CHILD_PROCESS_INIT;
char *p, *pend, *colored_p = NULL, *colored_pend = NULL, marker = '\0';
size_t file_diff_alloc = 0, i, color_arg_index;
struct file_diff *file_diff = NULL;
struct hunk *hunk = NULL;
int res;
strvec_pushv(&args, s->mode->diff_cmd);
if (diff_algorithm)
strvec_pushf(&args, "--diff-algorithm=%s", diff_algorithm);
if (s->revision) {
struct object_id oid;
strvec_push(&args,
/* could be on an unborn branch */
!strcmp("HEAD", s->revision) &&
get_oid("HEAD", &oid) ?
empty_tree_oid_hex() : s->revision);
}
color_arg_index = args.nr;
/* Use `--no-color` explicitly, just in case `diff.color = always`. */
strvec_pushl(&args, "--no-color", "-p", "--", NULL);
for (i = 0; i < ps->nr; i++)
strvec_push(&args, ps->items[i].original);
setup_child_process(s, &cp, NULL);
cp.argv = args.v;
res = capture_command(&cp, plain, 0);
if (res) {
strvec_clear(&args);
return error(_("could not parse diff"));
}
if (!plain->len) {
strvec_clear(&args);
return 0;
}
strbuf_complete_line(plain);
if (want_color_fd(1, -1)) {
struct child_process colored_cp = CHILD_PROCESS_INIT;
const char *diff_filter = s->s.interactive_diff_filter;
setup_child_process(s, &colored_cp, NULL);
xsnprintf((char *)args.v[color_arg_index], 8, "--color");
colored_cp.argv = args.v;
colored = &s->colored;
res = capture_command(&colored_cp, colored, 0);
strvec_clear(&args);
if (res)
return error(_("could not parse colored diff"));
if (diff_filter) {
struct child_process filter_cp = CHILD_PROCESS_INIT;
setup_child_process(s, &filter_cp,
diff_filter, NULL);
filter_cp.git_cmd = 0;
filter_cp.use_shell = 1;
strbuf_reset(&s->buf);
if (pipe_command(&filter_cp,
colored->buf, colored->len,
&s->buf, colored->len,
NULL, 0) < 0)
return error(_("failed to run '%s'"),
diff_filter);
strbuf_swap(colored, &s->buf);
}
strbuf_complete_line(colored);
colored_p = colored->buf;
colored_pend = colored_p + colored->len;
}
strvec_clear(&args);
/* parse files and hunks */
p = plain->buf;
pend = p + plain->len;
while (p != pend) {
char *eol = memchr(p, '\n', pend - p);
const char *deleted = NULL, *mode_change = NULL;
if (!eol)
eol = pend;
if (starts_with(p, "diff ")) {
ALLOC_GROW_BY(s->file_diff, s->file_diff_nr, 1,
file_diff_alloc);
file_diff = s->file_diff + s->file_diff_nr - 1;
hunk = &file_diff->head;
hunk->start = p - plain->buf;
if (colored_p)
hunk->colored_start = colored_p - colored->buf;
marker = '\0';
} else if (p == plain->buf)
BUG("diff starts with unexpected line:\n"
"%.*s\n", (int)(eol - p), p);
else if (file_diff->deleted)
; /* keep the rest of the file in a single "hunk" */
else if (starts_with(p, "@@ ") ||
(hunk == &file_diff->head &&
(skip_prefix(p, "deleted file", &deleted)))) {
if (marker == '-' || marker == '+')
/*
* Should not happen; previous hunk did not end
* in a context line? Handle it anyway.
*/
hunk->splittable_into++;
ALLOC_GROW_BY(file_diff->hunk, file_diff->hunk_nr, 1,
file_diff->hunk_alloc);
hunk = file_diff->hunk + file_diff->hunk_nr - 1;
hunk->start = p - plain->buf;
if (colored)
hunk->colored_start = colored_p - colored->buf;
if (deleted)
file_diff->deleted = 1;
else if (parse_hunk_header(s, hunk) < 0)
return -1;
/*
* Start counting into how many hunks this one can be
* split
*/
marker = *p;
} else if (hunk == &file_diff->head &&
starts_with(p, "new file")) {
file_diff->added = 1;
} else if (hunk == &file_diff->head &&
skip_prefix(p, "old mode ", &mode_change) &&
is_octal(mode_change, eol - mode_change)) {
if (file_diff->mode_change)
BUG("double mode change?\n\n%.*s",
(int)(eol - plain->buf), plain->buf);
if (file_diff->hunk_nr)
BUG("mode change in the middle?\n\n%.*s",
(int)(eol - plain->buf), plain->buf);
/*
* Do *not* change `hunk`: the mode change pseudo-hunk
* is _part of_ the header "hunk".
*/
file_diff->mode_change = 1;
ALLOC_GROW_BY(file_diff->hunk, file_diff->hunk_nr, 1,
file_diff->hunk_alloc);
file_diff->hunk->start = p - plain->buf;
if (colored_p)
file_diff->hunk->colored_start =
colored_p - colored->buf;
} else if (hunk == &file_diff->head &&
skip_prefix(p, "new mode ", &mode_change) &&
is_octal(mode_change, eol - mode_change)) {
/*
* Extend the "mode change" pseudo-hunk to include also
* the "new mode" line.
*/
if (!file_diff->mode_change)
BUG("'new mode' without 'old mode'?\n\n%.*s",
(int)(eol - plain->buf), plain->buf);
if (file_diff->hunk_nr != 1)
BUG("mode change in the middle?\n\n%.*s",
(int)(eol - plain->buf), plain->buf);
if (p - plain->buf != file_diff->hunk->end)
BUG("'new mode' does not immediately follow "
"'old mode'?\n\n%.*s",
(int)(eol - plain->buf), plain->buf);
} else if (hunk == &file_diff->head &&
starts_with(p, "Binary files "))
file_diff->binary = 1;
if (!!file_diff->deleted + !!file_diff->added +
!!file_diff->mode_change > 1)
BUG("diff can only contain delete *or* add *or* a "
"mode change?!?\n%.*s",
(int)(eol - (plain->buf + file_diff->head.start)),
plain->buf + file_diff->head.start);
if ((marker == '-' || marker == '+') && *p == ' ')
hunk->splittable_into++;
if (marker && *p != '\\')
marker = *p;
p = eol == pend ? pend : eol + 1;
hunk->end = p - plain->buf;
if (colored) {
char *colored_eol = memchr(colored_p, '\n',
colored_pend - colored_p);
if (colored_eol)
colored_p = colored_eol + 1;
else if (p != pend)
/* colored shorter than non-colored? */
goto mismatched_output;
else
colored_p = colored_pend;
hunk->colored_end = colored_p - colored->buf;
}
if (mode_change) {
if (file_diff->hunk_nr != 1)
BUG("mode change in hunk #%d???",
(int)file_diff->hunk_nr);
/* Adjust the end of the "mode change" pseudo-hunk */
file_diff->hunk->end = hunk->end;
if (colored)
file_diff->hunk->colored_end = hunk->colored_end;
}
}
if (marker == '-' || marker == '+')
/*
* Last hunk ended in non-context line (i.e. it appended lines
* to the file, so there are no trailing context lines).
*/
hunk->splittable_into++;
/* non-colored shorter than colored? */
if (colored_p != colored_pend) {
mismatched_output:
error(_("mismatched output from interactive.diffFilter"));
advise(_("Your filter must maintain a one-to-one correspondence\n"
"between its input and output lines."));
return -1;
}
return 0;
}
static size_t find_next_line(struct strbuf *sb, size_t offset)
{
char *eol;
if (offset >= sb->len)
BUG("looking for next line beyond buffer (%d >= %d)\n%s",
(int)offset, (int)sb->len, sb->buf);
eol = memchr(sb->buf + offset, '\n', sb->len - offset);
if (!eol)
return sb->len;
return eol - sb->buf + 1;
}
static void render_hunk(struct add_p_state *s, struct hunk *hunk,
ssize_t delta, int colored, struct strbuf *out)
{
struct hunk_header *header = &hunk->header;
if (hunk->header.old_offset != 0 || hunk->header.new_offset != 0) {
/*
* Generate the hunk header dynamically, except for special
* hunks (such as the diff header).
*/
const char *p;
size_t len;
unsigned long old_offset = header->old_offset;
unsigned long new_offset = header->new_offset;
if (!colored) {
p = s->plain.buf + header->extra_start;
len = header->extra_end - header->extra_start;
} else {
strbuf_addstr(out, s->s.fraginfo_color);
p = s->colored.buf + header->colored_extra_start;
len = header->colored_extra_end
- header->colored_extra_start;
}
if (s->mode->is_reverse)
old_offset -= delta;
else
new_offset += delta;
strbuf_addf(out, "@@ -%lu,%lu +%lu,%lu @@",
old_offset, header->old_count,
new_offset, header->new_count);
if (len)
strbuf_add(out, p, len);
else if (colored)
strbuf_addf(out, "%s\n", GIT_COLOR_RESET);
else
strbuf_addch(out, '\n');
}
if (colored)
strbuf_add(out, s->colored.buf + hunk->colored_start,
hunk->colored_end - hunk->colored_start);
else
strbuf_add(out, s->plain.buf + hunk->start,
hunk->end - hunk->start);
}
static void render_diff_header(struct add_p_state *s,
struct file_diff *file_diff, int colored,
struct strbuf *out)
{
/*
* If there was a mode change, the first hunk is a pseudo hunk that
* corresponds to the mode line in the header. If the user did not want
* to stage that "hunk", we actually have to cut it out from the header.
*/
int skip_mode_change =
file_diff->mode_change && file_diff->hunk->use != USE_HUNK;
struct hunk *head = &file_diff->head, *first = file_diff->hunk;
if (!skip_mode_change) {
render_hunk(s, head, 0, colored, out);
return;
}
if (colored) {
const char *p = s->colored.buf;
strbuf_add(out, p + head->colored_start,
first->colored_start - head->colored_start);
strbuf_add(out, p + first->colored_end,
head->colored_end - first->colored_end);
} else {
const char *p = s->plain.buf;
strbuf_add(out, p + head->start, first->start - head->start);
strbuf_add(out, p + first->end, head->end - first->end);
}
}
/* Coalesce hunks again that were split */
static int merge_hunks(struct add_p_state *s, struct file_diff *file_diff,
size_t *hunk_index, int use_all, struct hunk *merged)
{
size_t i = *hunk_index, delta;
struct hunk *hunk = file_diff->hunk + i;
/* `header` corresponds to the merged hunk */
struct hunk_header *header = &merged->header, *next;
if (!use_all && hunk->use != USE_HUNK)
return 0;
*merged = *hunk;
/* We simply skip the colored part (if any) when merging hunks */
merged->colored_start = merged->colored_end = 0;
for (; i + 1 < file_diff->hunk_nr; i++) {
hunk++;
next = &hunk->header;
/*
* Stop merging hunks when:
*
* - the hunk is not selected for use, or
* - the hunk does not overlap with the already-merged hunk(s)
*/
if ((!use_all && hunk->use != USE_HUNK) ||
header->new_offset >= next->new_offset + merged->delta ||
header->new_offset + header->new_count
< next->new_offset + merged->delta)
break;
/*
* If the hunks were not edited, and overlap, we can simply
* extend the line range.
*/
if (merged->start < hunk->start && merged->end > hunk->start) {
merged->end = hunk->end;
merged->colored_end = hunk->colored_end;
delta = 0;
} else {
const char *plain = s->plain.buf;
size_t overlapping_line_count = header->new_offset
+ header->new_count - merged->delta
- next->new_offset;
size_t overlap_end = hunk->start;
size_t overlap_start = overlap_end;
size_t overlap_next, len, j;
/*
* One of the hunks was edited: the modified hunk was
* appended to the strbuf `s->plain`.
*
* Let's ensure that at least the last context line of
* the first hunk overlaps with the corresponding line
* of the second hunk, and then merge.
*/
for (j = 0; j < overlapping_line_count; j++) {
overlap_next = find_next_line(&s->plain,
overlap_end);
if (overlap_next > hunk->end)
BUG("failed to find %d context lines "
"in:\n%.*s",
(int)overlapping_line_count,
(int)(hunk->end - hunk->start),
plain + hunk->start);
if (plain[overlap_end] != ' ')
return error(_("expected context line "
"#%d in\n%.*s"),
(int)(j + 1),
(int)(hunk->end
- hunk->start),
plain + hunk->start);
overlap_start = overlap_end;
overlap_end = overlap_next;
}
len = overlap_end - overlap_start;
if (len > merged->end - merged->start ||
memcmp(plain + merged->end - len,
plain + overlap_start, len))
return error(_("hunks do not overlap:\n%.*s\n"
"\tdoes not end with:\n%.*s"),
(int)(merged->end - merged->start),
plain + merged->start,
(int)len, plain + overlap_start);
/*
* Since the start-end ranges are not adjacent, we
* cannot simply take the union of the ranges. To
* address that, we temporarily append the union of the
* lines to the `plain` strbuf.
*/
if (merged->end != s->plain.len) {
size_t start = s->plain.len;
strbuf_add(&s->plain, plain + merged->start,
merged->end - merged->start);
plain = s->plain.buf;
merged->start = start;
merged->end = s->plain.len;
}
strbuf_add(&s->plain,
plain + overlap_end,
hunk->end - overlap_end);
merged->end = s->plain.len;
merged->splittable_into += hunk->splittable_into;
delta = merged->delta;
merged->delta += hunk->delta;
}
header->old_count = next->old_offset + next->old_count
- header->old_offset;
header->new_count = next->new_offset + delta
+ next->new_count - header->new_offset;
}
if (i == *hunk_index)
return 0;
*hunk_index = i;
return 1;
}
static void reassemble_patch(struct add_p_state *s,
struct file_diff *file_diff, int use_all,
struct strbuf *out)
{
struct hunk *hunk;
size_t save_len = s->plain.len, i;
ssize_t delta = 0;
render_diff_header(s, file_diff, 0, out);
for (i = file_diff->mode_change; i < file_diff->hunk_nr; i++) {
struct hunk merged = { 0 };
hunk = file_diff->hunk + i;
if (!use_all && hunk->use != USE_HUNK)
delta += hunk->header.old_count
- hunk->header.new_count;
else {
/* merge overlapping hunks into a temporary hunk */
if (merge_hunks(s, file_diff, &i, use_all, &merged))
hunk = &merged;
render_hunk(s, hunk, delta, 0, out);
/*
* In case `merge_hunks()` used `plain` as a scratch
* pad (this happens when an edited hunk had to be
* coalesced with another hunk).
*/
strbuf_setlen(&s->plain, save_len);
delta += hunk->delta;
}
}
}
static int split_hunk(struct add_p_state *s, struct file_diff *file_diff,
size_t hunk_index)
{
int colored = !!s->colored.len, first = 1;
struct hunk *hunk = file_diff->hunk + hunk_index;
size_t splittable_into;
size_t end, colored_end, current, colored_current = 0, context_line_count;
struct hunk_header remaining, *header;
char marker, ch;
if (hunk_index >= file_diff->hunk_nr)
BUG("invalid hunk index: %d (must be >= 0 and < %d)",
(int)hunk_index, (int)file_diff->hunk_nr);
if (hunk->splittable_into < 2)
return 0;
splittable_into = hunk->splittable_into;
end = hunk->end;
colored_end = hunk->colored_end;
remaining = hunk->header;
file_diff->hunk_nr += splittable_into - 1;
ALLOC_GROW(file_diff->hunk, file_diff->hunk_nr, file_diff->hunk_alloc);
if (hunk_index + splittable_into < file_diff->hunk_nr)
memmove(file_diff->hunk + hunk_index + splittable_into,
file_diff->hunk + hunk_index + 1,
(file_diff->hunk_nr - hunk_index - splittable_into)
* sizeof(*hunk));
hunk = file_diff->hunk + hunk_index;
hunk->splittable_into = 1;
memset(hunk + 1, 0, (splittable_into - 1) * sizeof(*hunk));
header = &hunk->header;
header->old_count = header->new_count = 0;
current = hunk->start;
if (colored)
colored_current = hunk->colored_start;
marker = '\0';
context_line_count = 0;
while (splittable_into > 1) {
ch = s->plain.buf[current];
if (!ch)
BUG("buffer overrun while splitting hunks");
/*
* Is this the first context line after a chain of +/- lines?
* Then record the start of the next split hunk.
*/
if ((marker == '-' || marker == '+') && ch == ' ') {
first = 0;
hunk[1].start = current;
if (colored)
hunk[1].colored_start = colored_current;
context_line_count = 0;
}
/*
* Was the previous line a +/- one? Alternatively, is this the
* first line (and not a +/- one)?
*
* Then just increment the appropriate counter and continue
* with the next line.
*/
if (marker != ' ' || (ch != '-' && ch != '+')) {
next_hunk_line:
/* Comment lines are attached to the previous line */
if (ch == '\\')
ch = marker ? marker : ' ';
/* current hunk not done yet */
if (ch == ' ')
context_line_count++;
else if (ch == '-')
header->old_count++;
else if (ch == '+')
header->new_count++;
else
BUG("unhandled diff marker: '%c'", ch);
marker = ch;
current = find_next_line(&s->plain, current);
if (colored)
colored_current =
find_next_line(&s->colored,
colored_current);
continue;
}
/*
* We got us the start of a new hunk!
*
* This is a context line, so it is shared with the previous
* hunk, if any.
*/
if (first) {
if (header->old_count || header->new_count)
BUG("counts are off: %d/%d",
(int)header->old_count,
(int)header->new_count);
header->old_count = context_line_count;
header->new_count = context_line_count;
context_line_count = 0;
first = 0;
goto next_hunk_line;
}
remaining.old_offset += header->old_count;
remaining.old_count -= header->old_count;
remaining.new_offset += header->new_count;
remaining.new_count -= header->new_count;
/* initialize next hunk header's offsets */
hunk[1].header.old_offset =
header->old_offset + header->old_count;
hunk[1].header.new_offset =