mirror of https://github.com/ZDoom/qzdoom.git
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
/* updaterevision.c
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*
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* Public domain. This program uses git commands command to get
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* various bits of repository status for a particular directory
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* and writes it into a header file so that it can be used for a
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* project's versioning.
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*/
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#define _CRT_SECURE_NO_DEPRECATE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#ifdef _WIN32
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#define popen _popen
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#define pclose _pclose
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#endif
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// Used to strip newline characters from lines read by fgets.
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void stripnl(char *str)
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{
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if (*str != '\0')
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{
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size_t len = strlen(str);
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if (str[len - 1] == '\n')
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{
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str[len - 1] = '\0';
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}
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}
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}
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int main(int argc, char **argv)
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{
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char vertag[128], lastlog[128], lasthash[128], *hash = NULL;
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FILE *stream = NULL;
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int gotrev = 0, needupdate = 1;
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vertag[0] = '\0';
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lastlog[0] = '\0';
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if (argc != 2)
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{
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fprintf(stderr, "Usage: %s <path to gitinfo.h>\n", argv[0]);
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return 1;
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}
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// Use git describe --tags to get a version string. If we are sitting directly
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// on a tag, it returns that tag. Otherwise it returns <most recent tag>-<number of
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// commits since the tag>-<short hash>.
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// Use git log to get the time of the latest commit in ISO 8601 format and its full hash.
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stream = popen("git describe --tags --dirty=-m && git log -1 --format=%ai*%H", "r");
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if (NULL != stream)
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{
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if (fgets(vertag, sizeof vertag, stream) == vertag &&
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fgets(lastlog, sizeof lastlog, stream) == lastlog)
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{
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stripnl(vertag);
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stripnl(lastlog);
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gotrev = 1;
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}
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pclose(stream);
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}
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if (gotrev)
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{
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hash = strchr(lastlog, '*');
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if (hash != NULL)
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{
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*hash = '\0';
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hash++;
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}
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}
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if (hash == NULL)
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{
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fprintf(stderr, "Failed to get commit info: %s\n", strerror(errno));
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strcpy(vertag, "<unknown version>");
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lastlog[0] = '\0';
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lastlog[1] = '0';
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lastlog[2] = '\0';
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hash = lastlog + 1;
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}
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stream = fopen (argv[1], "r");
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if (stream != NULL)
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{
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if (!gotrev)
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{ // If we didn't get a revision but the file does exist, leave it alone.
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fclose (stream);
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return 0;
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}
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// Read the revision that's in this file already. If it's the same as
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// what we've got, then we don't need to modify it and can avoid rebuilding
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// dependant files.
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if (fgets(lasthash, sizeof lasthash, stream) == lasthash)
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{
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stripnl(lasthash);
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if (strcmp(hash, lasthash + 3) == 0)
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{
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needupdate = 0;
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}
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}
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fclose (stream);
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}
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if (needupdate)
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{
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stream = fopen (argv[1], "w");
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if (stream == NULL)
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{
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return 1;
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}
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fprintf(stream,
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"// %s\n"
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"//\n"
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"// This file was automatically generated by the\n"
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"// updaterevision tool. Do not edit by hand.\n"
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"\n"
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"#define GIT_DESCRIPTION \"%s\"\n"
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"#define GIT_HASH \"%s\"\n"
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"#define GIT_TIME \"%s\"\n",
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hash, vertag, hash, lastlog);
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fclose(stream);
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fprintf(stderr, "%s updated to commit %s.\n", argv[1], vertag);
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}
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else
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{
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fprintf (stderr, "%s is up to date at commit %s.\n", argv[1], vertag);
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}
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return 0;
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}
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