thodg/libgit2/examples/log.c

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• Hash : 0d44d3dc
  Author :
  Date : 2013-06-24T23:21:23
  

  Extending log example code
  
  This adds more command line processing to the example version of
  log.  In particular, this adds the funky command line processing
  that allows an arbitrary series of revisions followed by an
  arbitrary number of paths and/or glob patterns.
  
  The actual logging part still isn't implemented.
  

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• examples/log.c

• #include <stdio.h>
  #include <git2.h>
  #include <stdlib.h>
  #include <string.h>
  
  static void check(int error, const char *message)
  {
  	if (error) {
  		fprintf(stderr, "%s (%d)\n", message, error);
  		exit(1);
  	}
  }
  
  static int check_str_param(const char *arg, const char *pat, const char **val)
  {
  	size_t len = strlen(pat);
  	if (strncmp(arg, pat, len))
  		return 0;
  	*val = (const char *)(arg + len);
  	return 1;
  }
  
  static void usage(const char *message, const char *arg)
  {
  	if (message && arg)
  		fprintf(stderr, "%s: %s\n", message, arg);
  	else if (message)
  		fprintf(stderr, "%s\n", message);
  	fprintf(stderr, "usage: log [<options>]\n");
  	exit(1);
  }
  
  int main(int argc, char *argv[])
  {
  	int i, j, last_nonoption, force_files = -1;
  	char *a;
  	const char *dir = ".";
  	git_repository *repo;
  	git_revwalk *walker;
  	git_revspec revs;
  
  	git_threads_init();
  
  	for (i = 1, last_nonoption = 1; i < argc; ++i) {
  		a = argv[i];
  
  		if (a[0] != '-' || force_files > 0) {
  			/* condense args not prefixed with '-' to start of argv */
  			if (last_nonoption != i)
  				argv[last_nonoption] = a;
  			last_nonoption++;
  		}
  		else if (!strcmp(a, "--"))
  			force_files = last_nonoption; /* copy all args as filenames */
  		else if (!check_str_param(a, "--git-dir=", &dir))
  			usage("Unknown argument", a);
  	}
  
  	check(git_repository_open_ext(&repo, dir, 0, NULL),
  		"Could not open repository");
  	check(git_revwalk_new(&walker, repo),
  		"Could not create revision walker");
  
  	if (force_files < 0)
  		force_files = last_nonoption;
  
  	for (i = 1; i < force_files; ) {
  		printf("option '%s'\n", argv[i]);
  
  		if (!git_revparse(&revs, repo, argv[i])) {
  			char str[GIT_OID_HEXSZ+1];
  
  			if (revs.from) {
  				git_oid_tostr(str, sizeof(str), git_object_id(revs.from));
  				printf("revwalk from %s\n", str);
  			}
  			if (revs.to) {
  				git_oid_tostr(str, sizeof(str), git_object_id(revs.to));
  				printf("revwalk to %s\n", str);
  			}
  
  			/* push / hide / merge-base in revwalker */
  
  			++i;
  		} else {
  			/* shift array down */
  			for (a = argv[i], j = i + 1; j < force_files; ++j)
  				argv[j - 1] = argv[j];
  			argv[--force_files] = a;
  		}
  	}
  
  	if (i == 1) {
  		/* no revs pushed so push HEAD */
  		printf("revwalk HEAD\n");
  	}
  
  	for (i = force_files; i < last_nonoption; ++i)
  		printf("file %s\n", argv[i]);
  
  	git_repository_free(repo);
  	git_threads_shutdown();
  
  	return 0;
  }
  

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