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#include "cache.h"
#include "exec_cmd.h"
static void flush_current_id(int patchlen, unsigned char *id, git_SHA_CTX *c)
{
unsigned char result[20];
char name[50];
if (!patchlen)
return;
git_SHA1_Final(result, c);
memcpy(name, sha1_to_hex(id), 41);
printf("%s %s\n", sha1_to_hex(result), name);
git_SHA1_Init(c);
}
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;
}
int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx)
{
static char line[1000];
int patchlen = 0, found_next = 0;
while (fgets(line, sizeof(line), stdin) != NULL) {
char *p = line;
int len;
if (!memcmp(line, "diff-tree ", 10))
p += 10;
else if (!memcmp(line, "commit ", 7))
p += 7;
if (!get_sha1_hex(p, next_sha1)) {
found_next = 1;
break;
}
/* Ignore commit comments */
if (!patchlen && memcmp(line, "diff ", 5))
continue;
/* Ignore git-diff index header */
if (!memcmp(line, "index ", 6))
continue;
/* Ignore line numbers when computing the SHA1 of the patch */
if (!memcmp(line, "@@ -", 4))
continue;
/* Compute the sha without whitespace */
len = remove_space(line);
patchlen += len;
git_SHA1_Update(ctx, line, len);
}
if (!found_next)
hashclr(next_sha1);
return patchlen;
}
static void generate_id_list(void)
{
unsigned char sha1[20], n[20];
git_SHA_CTX ctx;
int patchlen;
git_SHA1_Init(&ctx);
hashclr(sha1);
while (!feof(stdin)) {
patchlen = get_one_patchid(n, &ctx);
flush_current_id(patchlen, sha1, &ctx);
hashcpy(sha1, n);
}
}
static const char patch_id_usage[] = "git patch-id < patch";
int cmd_patch_id(int argc, const char **argv, const char *prefix)
{
if (argc != 1)
usage(patch_id_usage);
generate_id_list();
return 0;
}
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