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![René Scharfe](/assets/img/avatar_default.png)
flush_current_id() prints the hexadecimal representation of two object IDs. When the code was added inf97672225b
(Add "git-patch-id" program to generate patch ID's., 2005-06-23), sha1_to_hex() had only a single internal static buffer, so the result of one invocation had to be stored in a local buffer. Sincedcb3450fd8
(sha1_to_hex() usage cleanup, 2006-05-03) it rotates through four buffers, which allows to print up to four object IDs at the same time.1a876a69af
(patch-id: convert to use struct object_id, 2015-03-13) replaced sha1_to_hex() with oid_to_hex(), which has the same feature. Use it to simplify the code. Signed-off-by: René Scharfe <l.s.r@web.de> Acked-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
181 lines
3.7 KiB
C
181 lines
3.7 KiB
C
#include "cache.h"
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#include "builtin.h"
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#include "config.h"
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#include "diff.h"
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static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result)
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{
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if (patchlen)
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printf("%s %s\n", oid_to_hex(result), oid_to_hex(id));
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}
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static int remove_space(char *line)
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{
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char *src = line;
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char *dst = line;
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unsigned char c;
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while ((c = *src++) != '\0') {
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if (!isspace(c))
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*dst++ = c;
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}
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return dst - line;
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}
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static int scan_hunk_header(const char *p, int *p_before, int *p_after)
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{
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static const char digits[] = "0123456789";
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const char *q, *r;
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int n;
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q = p + 4;
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n = strspn(q, digits);
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if (q[n] == ',') {
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q += n + 1;
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n = strspn(q, digits);
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}
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if (n == 0 || q[n] != ' ' || q[n+1] != '+')
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return 0;
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r = q + n + 2;
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n = strspn(r, digits);
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if (r[n] == ',') {
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r += n + 1;
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n = strspn(r, digits);
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}
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if (n == 0)
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return 0;
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*p_before = atoi(q);
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*p_after = atoi(r);
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return 1;
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}
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static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
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struct strbuf *line_buf, int stable)
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{
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int patchlen = 0, found_next = 0;
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int before = -1, after = -1;
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git_hash_ctx ctx;
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the_hash_algo->init_fn(&ctx);
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oidclr(result);
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while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
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char *line = line_buf->buf;
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const char *p = line;
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int len;
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if (!skip_prefix(line, "diff-tree ", &p) &&
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!skip_prefix(line, "commit ", &p) &&
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!skip_prefix(line, "From ", &p) &&
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starts_with(line, "\\ ") && 12 < strlen(line))
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continue;
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if (!get_oid_hex(p, next_oid)) {
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found_next = 1;
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break;
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}
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/* Ignore commit comments */
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if (!patchlen && !starts_with(line, "diff "))
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continue;
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/* Parsing diff header? */
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if (before == -1) {
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if (starts_with(line, "index "))
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continue;
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else if (starts_with(line, "--- "))
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before = after = 1;
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else if (!isalpha(line[0]))
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break;
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}
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/* Looking for a valid hunk header? */
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if (before == 0 && after == 0) {
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if (starts_with(line, "@@ -")) {
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/* Parse next hunk, but ignore line numbers. */
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scan_hunk_header(line, &before, &after);
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continue;
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}
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/* Split at the end of the patch. */
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if (!starts_with(line, "diff "))
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break;
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/* Else we're parsing another header. */
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if (stable)
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flush_one_hunk(result, &ctx);
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before = after = -1;
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}
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/* If we get here, we're inside a hunk. */
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if (line[0] == '-' || line[0] == ' ')
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before--;
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if (line[0] == '+' || line[0] == ' ')
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after--;
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/* Compute the sha without whitespace */
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len = remove_space(line);
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patchlen += len;
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the_hash_algo->update_fn(&ctx, line, len);
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}
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if (!found_next)
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oidclr(next_oid);
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flush_one_hunk(result, &ctx);
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return patchlen;
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}
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static void generate_id_list(int stable)
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{
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struct object_id oid, n, result;
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int patchlen;
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struct strbuf line_buf = STRBUF_INIT;
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oidclr(&oid);
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while (!feof(stdin)) {
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patchlen = get_one_patchid(&n, &result, &line_buf, stable);
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flush_current_id(patchlen, &oid, &result);
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oidcpy(&oid, &n);
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}
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strbuf_release(&line_buf);
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}
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static const char patch_id_usage[] = "git patch-id [--stable | --unstable]";
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static int git_patch_id_config(const char *var, const char *value, void *cb)
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{
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int *stable = cb;
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if (!strcmp(var, "patchid.stable")) {
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*stable = git_config_bool(var, value);
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return 0;
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}
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return git_default_config(var, value, cb);
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}
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int cmd_patch_id(int argc, const char **argv, const char *prefix)
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{
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int stable = -1;
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git_config(git_patch_id_config, &stable);
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/* If nothing is set, default to unstable. */
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if (stable < 0)
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stable = 0;
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if (argc == 2 && !strcmp(argv[1], "--stable"))
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stable = 1;
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else if (argc == 2 && !strcmp(argv[1], "--unstable"))
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stable = 0;
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else if (argc != 1)
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usage(patch_id_usage);
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generate_id_list(stable);
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return 0;
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}
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