sha1_name: warning ambiguous refs.
[gitweb.git] / cat-file.c
index 74a0a234dd346fff51c773aa57d82fc4b83a8557..761111eb0f1f3266fe6bd0e9e561ee3d3d6c21d4 100644 (file)
@@ -1,4 +1,95 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ */
 #include "cache.h"
+#include "exec_cmd.h"
+
+static void flush_buffer(const char *buf, unsigned long size)
+{
+       while (size > 0) {
+               long ret = xwrite(1, buf, size);
+               if (ret < 0) {
+                       /* Ignore epipe */
+                       if (errno == EPIPE)
+                               break;
+                       die("git-cat-file: %s", strerror(errno));
+               } else if (!ret) {
+                       die("git-cat-file: disk full?");
+               }
+               size -= ret;
+               buf += ret;
+       }
+}
+
+static int pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
+{
+       /* the parser in tag.c is useless here. */
+       const char *endp = buf + size;
+       const char *cp = buf;
+
+       while (cp < endp) {
+               char c = *cp++;
+               if (c != '\n')
+                       continue;
+               if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
+                       const char *tagger = cp;
+
+                       /* Found the tagger line.  Copy out the contents
+                        * of the buffer so far.
+                        */
+                       flush_buffer(buf, cp - buf);
+
+                       /*
+                        * Do something intelligent, like pretty-printing
+                        * the date.
+                        */
+                       while (cp < endp) {
+                               if (*cp++ == '\n') {
+                                       /* tagger to cp is a line
+                                        * that has ident and time.
+                                        */
+                                       const char *sp = tagger;
+                                       char *ep;
+                                       unsigned long date;
+                                       long tz;
+                                       while (sp < cp && *sp != '>')
+                                               sp++;
+                                       if (sp == cp) {
+                                               /* give up */
+                                               flush_buffer(tagger,
+                                                            cp - tagger);
+                                               break;
+                                       }
+                                       while (sp < cp &&
+                                              !('0' <= *sp && *sp <= '9'))
+                                               sp++;
+                                       flush_buffer(tagger, sp - tagger);
+                                       date = strtoul(sp, &ep, 10);
+                                       tz = strtol(ep, NULL, 10);
+                                       sp = show_date(date, tz);
+                                       flush_buffer(sp, strlen(sp));
+                                       xwrite(1, "\n", 1);
+                                       break;
+                               }
+                       }
+                       break;
+               }
+               if (cp < endp && *cp == '\n')
+                       /* end of header */
+                       break;
+       }
+       /* At this point, we have copied out the header up to the end of
+        * the tagger line and cp points at one past \n.  It could be the
+        * next header line after the tagger line, or it could be another
+        * \n that marks the end of the headers.  We need to copy out the
+        * remainder as is.
+        */
+       if (cp < endp)
+               flush_buffer(cp, endp - cp);
+       return 0;
+}
 
 int main(int argc, char **argv)
 {
@@ -6,18 +97,67 @@ int main(int argc, char **argv)
        char type[20];
        void *buf;
        unsigned long size;
-       char template[] = "temp_git_file_XXXXXX";
-       int fd;
+       int opt;
+
+       setup_git_directory();
+       git_config(git_default_config);
+       if (argc != 3 || get_sha1(argv[2], sha1))
+               usage("git-cat-file [-t|-s|-e|-p|<type>] <sha1>");
+
+       opt = 0;
+       if ( argv[1][0] == '-' ) {
+               opt = argv[1][1];
+               if ( !opt || argv[1][2] )
+                       opt = -1; /* Not a single character option */
+       }
+
+       buf = NULL;
+       switch (opt) {
+       case 't':
+               if (!sha1_object_info(sha1, type, NULL)) {
+                       printf("%s\n", type);
+                       return 0;
+               }
+               break;
+
+       case 's':
+               if (!sha1_object_info(sha1, type, &size)) {
+                       printf("%lu\n", size);
+                       return 0;
+               }
+               break;
+
+       case 'e':
+               return !has_sha1_file(sha1);
+
+       case 'p':
+               if (get_sha1(argv[2], sha1) ||
+                   sha1_object_info(sha1, type, NULL))
+                       die("Not a valid object name %s", argv[2]);
+
+               /* custom pretty-print here */
+               if (!strcmp(type, "tree"))
+                       return execl_git_cmd("ls-tree", argv[2], NULL);
+
+               buf = read_sha1_file(sha1, type, &size);
+               if (!buf)
+                       die("Cannot read object %s", argv[2]);
+               if (!strcmp(type, "tag"))
+                       return pprint_tag(sha1, buf, size);
+
+               /* otherwise just spit out the data */
+               break;
+       case 0:
+               buf = read_object_with_reference(sha1, argv[1], &size, NULL);
+               break;
+
+       default:
+               die("git-cat-file: unknown option: %s\n", argv[1]);
+       }
 
-       if (argc != 2 || get_sha1_hex(argv[1], sha1))
-               usage("cat-file: cat-file <sha1>");
-       buf = read_sha1_file(sha1, type, &size);
        if (!buf)
-               exit(1);
-       fd = mkstemp(template);
-       if (fd < 0)
-               usage("unable to create tempfile");
-       if (write(fd, buf, size) != size)
-               strcpy(type, "bad");
-       printf("%s: %s\n", template, type);
+               die("git-cat-file %s: bad file", argv[2]);
+
+       flush_buffer(buf, size);
+       return 0;
 }