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#include "builtin.h"
#include "config.h"
#include "diff.h"
#include "gettext.h"
#include "hash.h"
#include "hex.h"
#include "parse-options.h"
static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result)
{
if (patchlen)
printf("%s %s\n", oid_to_hex(result), oid_to_hex(id));
}
static int remove_space(char *line)
{
char *src = line;
char *dst = line;
unsigned char c;
while ((c = *src++) != '\0') {
if (!isspace(c))
*dst++ = c;
}
return dst - line;
}
static int scan_hunk_header(const char *p, int *p_before, int *p_after)
{
static const char digits[] = "0123456789";
const char *q, *r;
int n;
q = p + 4;
n = strspn(q, digits);
if (q[n] == ',') {
q += n + 1;
*p_before = atoi(q);
n = strspn(q, digits);
} else {
*p_before = 1;
}
if (n == 0 || q[n] != ' ' || q[n+1] != '+')
return 0;
r = q + n + 2;
n = strspn(r, digits);
if (r[n] == ',') {
r += n + 1;
*p_after = atoi(r);
n = strspn(r, digits);
} else {
*p_after = 1;
}
if (n == 0)
return 0;
return 1;
}
static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
struct strbuf *line_buf, int stable, int verbatim)
{
int patchlen = 0, found_next = 0;
int before = -1, after = -1;
int diff_is_binary = 0;
char pre_oid_str[GIT_MAX_HEXSZ + 1], post_oid_str[GIT_MAX_HEXSZ + 1];
git_hash_ctx ctx;
the_hash_algo->init_fn(&ctx);
oidclr(result);
while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
char *line = line_buf->buf;
const char *p = line;
int len;
/* Possibly skip over the prefix added by "log" or "format-patch" */
if (!skip_prefix(line, "commit ", &p) &&
!skip_prefix(line, "From ", &p) &&
starts_with(line, "\\ ") && 12 < strlen(line)) {
if (verbatim)
the_hash_algo->update_fn(&ctx, line, strlen(line));
continue;
}
if (!get_oid_hex(p, next_oid)) {
found_next = 1;
break;
}
/* Ignore commit comments */
if (!patchlen && !starts_with(line, "diff "))
continue;
/* Parsing diff header? */
if (before == -1) {
if (starts_with(line, "GIT binary patch") ||
starts_with(line, "Binary files")) {
diff_is_binary = 1;
before = 0;
the_hash_algo->update_fn(&ctx, pre_oid_str,
strlen(pre_oid_str));
the_hash_algo->update_fn(&ctx, post_oid_str,
strlen(post_oid_str));
if (stable)
flush_one_hunk(result, &ctx);
continue;
} else if (skip_prefix(line, "index ", &p)) {
char *oid1_end = strstr(line, "..");
char *oid2_end = NULL;
if (oid1_end)
oid2_end = strstr(oid1_end, " ");
if (!oid2_end)
oid2_end = line + strlen(line) - 1;
if (oid1_end != NULL && oid2_end != NULL) {
*oid1_end = *oid2_end = '\0';
strlcpy(pre_oid_str, p, GIT_MAX_HEXSZ + 1);
strlcpy(post_oid_str, oid1_end + 2, GIT_MAX_HEXSZ + 1);
}
continue;
} else if (starts_with(line, "--- "))
before = after = 1;
else if (!isalpha(line[0]))
break;
}
if (diff_is_binary) {
if (starts_with(line, "diff ")) {
diff_is_binary = 0;
before = -1;
}
continue;
}
/* Looking for a valid hunk header? */
if (before == 0 && after == 0) {
if (starts_with(line, "@@ -")) {
/* Parse next hunk, but ignore line numbers. */
scan_hunk_header(line, &before, &after);
continue;
}
/* Split at the end of the patch. */
if (!starts_with(line, "diff "))
break;
/* Else we're parsing another header. */
if (stable)
flush_one_hunk(result, &ctx);
before = after = -1;
}
/* If we get here, we're inside a hunk. */
if (line[0] == '-' || line[0] == ' ')
before--;
if (line[0] == '+' || line[0] == ' ')
after--;
/* Add line to hash algo (possibly removing whitespace) */
len = verbatim ? strlen(line) : remove_space(line);
patchlen += len;
the_hash_algo->update_fn(&ctx, line, len);
}
if (!found_next)
oidclr(next_oid);
flush_one_hunk(result, &ctx);
return patchlen;
}
static void generate_id_list(int stable, int verbatim)
{
struct object_id oid, n, result;
int patchlen;
struct strbuf line_buf = STRBUF_INIT;
oidclr(&oid);
while (!feof(stdin)) {
patchlen = get_one_patchid(&n, &result, &line_buf, stable, verbatim);
flush_current_id(patchlen, &oid, &result);
oidcpy(&oid, &n);
}
strbuf_release(&line_buf);
}
static const char *const patch_id_usage[] = {
N_("git patch-id [--stable | --unstable | --verbatim]"), NULL
};
struct patch_id_opts {
int stable;
int verbatim;
};
static int git_patch_id_config(const char *var, const char *value,
const struct config_context *ctx, void *cb)
{
struct patch_id_opts *opts = cb;
if (!strcmp(var, "patchid.stable")) {
opts->stable = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "patchid.verbatim")) {
opts->verbatim = git_config_bool(var, value);
return 0;
}
return git_default_config(var, value, ctx, cb);
}
int cmd_patch_id(int argc, const char **argv, const char *prefix)
{
/* if nothing is set, default to unstable */
struct patch_id_opts config = {0, 0};
int opts = 0;
struct option builtin_patch_id_options[] = {
OPT_CMDMODE(0, "unstable", &opts,
N_("use the unstable patch-id algorithm"), 1),
OPT_CMDMODE(0, "stable", &opts,
N_("use the stable patch-id algorithm"), 2),
OPT_CMDMODE(0, "verbatim", &opts,
N_("don't strip whitespace from the patch"), 3),
OPT_END()
};
git_config(git_patch_id_config, &config);
/* verbatim implies stable */
if (config.verbatim)
config.stable = 1;
argc = parse_options(argc, argv, prefix, builtin_patch_id_options,
patch_id_usage, 0);
generate_id_list(opts ? opts > 1 : config.stable,
opts ? opts == 3 : config.verbatim);
return 0;
}
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