builtin/patch-id.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "diff.h"
   4
   5 static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result)
   6 {
   7         char name[50];
   8
   9         if (!patchlen)
  10                 return;
  11
  12         memcpy(name, oid_to_hex(id), GIT_SHA1_HEXSZ + 1);
  13         printf("%s %s\n", oid_to_hex(result), name);
  14 }
  15
  16 static int remove_space(char *line)
  17 {
  18         char *src = line;
  19         char *dst = line;
  20         unsigned char c;
  21
  22         while ((c = *src++) != '\0') {
  23                 if (!isspace(c))
  24                         *dst++ = c;
  25         }
  26         return dst - line;
  27 }
  28
  29 static int scan_hunk_header(const char *p, int *p_before, int *p_after)
  30 {
  31         static const char digits[] = "0123456789";
  32         const char *q, *r;
  33         int n;
  34
  35         q = p + 4;
  36         n = strspn(q, digits);
  37         if (q[n] == ',') {
  38                 q += n + 1;
  39                 n = strspn(q, digits);
  40         }
  41         if (n == 0 || q[n] != ' ' || q[n+1] != '+')
  42                 return 0;
  43
  44         r = q + n + 2;
  45         n = strspn(r, digits);
  46         if (r[n] == ',') {
  47                 r += n + 1;
  48                 n = strspn(r, digits);
  49         }
  50         if (n == 0)
  51                 return 0;
  52
  53         *p_before = atoi(q);
  54         *p_after = atoi(r);
  55         return 1;
  56 }
  57
  58 static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
  59                            struct strbuf *line_buf, int stable)
  60 {
  61         int patchlen = 0, found_next = 0;
  62         int before = -1, after = -1;
  63         git_SHA_CTX ctx;
  64
  65         git_SHA1_Init(&ctx);
  66         oidclr(result);
  67
  68         while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
  69                 char *line = line_buf->buf;
  70                 const char *p = line;
  71                 int len;
  72
  73                 if (!skip_prefix(line, "diff-tree ", &p) &&
  74                     !skip_prefix(line, "commit ", &p) &&
  75                     !skip_prefix(line, "From ", &p) &&
  76                     starts_with(line, "\\ ") && 12 < strlen(line))
  77                         continue;
  78
  79                 if (!get_oid_hex(p, next_oid)) {
  80                         found_next = 1;
  81                         break;
  82                 }
  83
  84                 /* Ignore commit comments */
  85                 if (!patchlen && !starts_with(line, "diff "))
  86                         continue;
  87
  88                 /* Parsing diff header?  */
  89                 if (before == -1) {
  90                         if (starts_with(line, "index "))
  91                                 continue;
  92                         else if (starts_with(line, "--- "))
  93                                 before = after = 1;
  94                         else if (!isalpha(line[0]))
  95                                 break;
  96                 }
  97
  98                 /* Looking for a valid hunk header?  */
  99                 if (before == 0 && after == 0) {
 100                         if (starts_with(line, "@@ -")) {
 101                                 /* Parse next hunk, but ignore line numbers.  */
 102                                 scan_hunk_header(line, &before, &after);
 103                                 continue;
 104                         }
 105
 106                         /* Split at the end of the patch.  */
 107                         if (!starts_with(line, "diff "))
 108                                 break;
 109
 110                         /* Else we're parsing another header.  */
 111                         if (stable)
 112                                 flush_one_hunk(result, &ctx);
 113                         before = after = -1;
 114                 }
 115
 116                 /* If we get here, we're inside a hunk.  */
 117                 if (line[0] == '-' || line[0] == ' ')
 118                         before--;
 119                 if (line[0] == '+' || line[0] == ' ')
 120                         after--;
 121
 122                 /* Compute the sha without whitespace */
 123                 len = remove_space(line);
 124                 patchlen += len;
 125                 git_SHA1_Update(&ctx, line, len);
 126         }
 127
 128         if (!found_next)
 129                 oidclr(next_oid);
 130
 131         flush_one_hunk(result, &ctx);
 132
 133         return patchlen;
 134 }
 135
 136 static void generate_id_list(int stable)
 137 {
 138         struct object_id oid, n, result;
 139         int patchlen;
 140         struct strbuf line_buf = STRBUF_INIT;
 141
 142         oidclr(&oid);
 143         while (!feof(stdin)) {
 144                 patchlen = get_one_patchid(&n, &result, &line_buf, stable);
 145                 flush_current_id(patchlen, &oid, &result);
 146                 oidcpy(&oid, &n);
 147         }
 148         strbuf_release(&line_buf);
 149 }
 150
 151 static const char patch_id_usage[] = "git patch-id [--stable | --unstable]";
 152
 153 static int git_patch_id_config(const char *var, const char *value, void *cb)
 154 {
 155         int *stable = cb;
 156
 157         if (!strcmp(var, "patchid.stable")) {
 158                 *stable = git_config_bool(var, value);
 159                 return 0;
 160         }
 161
 162         return git_default_config(var, value, cb);
 163 }
 164
 165 int cmd_patch_id(int argc, const char **argv, const char *prefix)
 166 {
 167         int stable = -1;
 168
 169         git_config(git_patch_id_config, &stable);
 170
 171         /* If nothing is set, default to unstable. */
 172         if (stable < 0)
 173                 stable = 0;
 174
 175         if (argc == 2 && !strcmp(argv[1], "--stable"))
 176                 stable = 1;
 177         else if (argc == 2 && !strcmp(argv[1], "--unstable"))
 178                 stable = 0;
 179         else if (argc != 1)
 180                 usage(patch_id_usage);
 181
 182         generate_id_list(stable);
 183         return 0;
 184 }