comparison: updaterevision/updaterevision.c
updaterevision/updaterevision.c
- changeset 632
- 63e6243b880c
- child 659
- 06c4477675e4
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| 631:93272c0f9a80 | 632:63e6243b880c |
|---|---|
| 1 /* updaterevision.c | |
| 2 * | |
| 3 * Public domain. This program uses git commands command to get | |
| 4 * various bits of repository status for a particular directory | |
| 5 * and writes it into a header file so that it can be used for a | |
| 6 * project's versioning. | |
| 7 */ | |
| 8 | |
| 9 #define _CRT_SECURE_NO_DEPRECATE | |
| 10 | |
| 11 #include <stdio.h> | |
| 12 #include <stdlib.h> | |
| 13 #include <string.h> | |
| 14 #include <ctype.h> | |
| 15 #include <errno.h> | |
| 16 | |
| 17 #ifdef _WIN32 | |
| 18 #define popen _popen | |
| 19 #define pclose _pclose | |
| 20 #endif | |
| 21 | |
| 22 // Used to strip newline characters from lines read by fgets. | |
| 23 void stripnl(char *str) | |
| 24 { | |
| 25 if (*str != '\0') | |
| 26 { | |
| 27 size_t len = strlen(str); | |
| 28 if (str[len - 1] == '\n') | |
| 29 { | |
| 30 str[len - 1] = '\0'; | |
| 31 } | |
| 32 } | |
| 33 } | |
| 34 | |
| 35 int main(int argc, char **argv) | |
| 36 { | |
| 37 char vertag[64], lastlog[64], lasthash[64], *hash = NULL; | |
| 38 FILE *stream = NULL; | |
| 39 int gotrev = 0, needupdate = 1; | |
| 40 | |
| 41 vertag[0] = '\0'; | |
| 42 lastlog[0] = '\0'; | |
| 43 | |
| 44 if (argc != 2) | |
| 45 { | |
| 46 fprintf(stderr, "Usage: %s <path to gitinfo.h>\n", argv[0]); | |
| 47 return 1; | |
| 48 } | |
| 49 | |
| 50 // Use git describe --tags to get a version string. If we are sitting directly | |
| 51 // on a tag, it returns that tag. Otherwise it returns <most recent tag>-<number of | |
| 52 // commits since the tag>-<short hash>. | |
| 53 // Use git log to get the time of the latest commit in ISO 8601 format and its full hash. | |
| 54 stream = popen("git describe --tags && git log -1 --format=%ai*%H", "r"); | |
| 55 | |
| 56 if (NULL != stream) | |
| 57 { | |
| 58 if (fgets(vertag, sizeof vertag, stream) == vertag && | |
| 59 fgets(lastlog, sizeof lastlog, stream) == lastlog) | |
| 60 { | |
| 61 stripnl(vertag); | |
| 62 stripnl(lastlog); | |
| 63 gotrev = 1; | |
| 64 } | |
| 65 | |
| 66 pclose(stream); | |
| 67 } | |
| 68 | |
| 69 if (gotrev) | |
| 70 { | |
| 71 hash = strchr(lastlog, '*'); | |
| 72 if (hash != NULL) | |
| 73 { | |
| 74 *hash = '\0'; | |
| 75 hash++; | |
| 76 } | |
| 77 } | |
| 78 if (hash == NULL) | |
| 79 { | |
| 80 fprintf(stderr, "Failed to get commit info: %s\n", strerror(errno)); | |
| 81 strcpy(vertag, "<unknown version>"); | |
| 82 lastlog[0] = '\0'; | |
| 83 lastlog[1] = '0'; | |
| 84 lastlog[2] = '\0'; | |
| 85 hash = lastlog + 1; | |
| 86 } | |
| 87 | |
| 88 stream = fopen (argv[1], "r"); | |
| 89 if (stream != NULL) | |
| 90 { | |
| 91 if (!gotrev) | |
| 92 { // If we didn't get a revision but the file does exist, leave it alone. | |
| 93 fclose (stream); | |
| 94 return 0; | |
| 95 } | |
| 96 // Read the revision that's in this file already. If it's the same as | |
| 97 // what we've got, then we don't need to modify it and can avoid rebuilding | |
| 98 // dependant files. | |
| 99 if (fgets(lasthash, sizeof lasthash, stream) == lasthash) | |
| 100 { | |
| 101 stripnl(lasthash); | |
| 102 if (strcmp(hash, lasthash + 3) == 0) | |
| 103 { | |
| 104 needupdate = 0; | |
| 105 } | |
| 106 } | |
| 107 fclose (stream); | |
| 108 } | |
| 109 | |
| 110 if (needupdate) | |
| 111 { | |
| 112 stream = fopen (argv[1], "w"); | |
| 113 if (stream == NULL) | |
| 114 { | |
| 115 return 1; | |
| 116 } | |
| 117 fprintf(stream, | |
| 118 "// %s\n" | |
| 119 "//\n" | |
| 120 "// This file was automatically generated by the\n" | |
| 121 "// updaterevision tool. Do not edit by hand.\n" | |
| 122 "\n" | |
| 123 "#define GIT_DESCRIPTION \"%s\"\n" | |
| 124 "#define GIT_HASH \"%s\"\n" | |
| 125 "#define GIT_TIME \"%s\"\n", | |
| 126 hash, vertag, hash, lastlog); | |
| 127 fclose(stream); | |
| 128 fprintf(stderr, "%s updated to commit %s.\n", argv[1], vertag); | |
| 129 } | |
| 130 else | |
| 131 { | |
| 132 fprintf (stderr, "%s is up to date at commit %s.\n", argv[1], vertag); | |
| 133 } | |
| 134 | |
| 135 return 0; | |
| 136 } |
