thodg/libgit2/examples/rev-parse.c

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• Hash : dbc4ac1c
  Author :
  Date : 2022-01-22T23:10:03
  

  oid: `GIT_OID_*SZ` is now `GIT_OID_SHA1_*SIZE` In preparation for SHA256 support, `GIT_OID_RAWSZ` and `GIT_OID_HEXSZ` need to indicate that they're the size of _SHA1_ OIDs.

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• examples/rev-parse.c

• /*
   * libgit2 "rev-parse" example - shows how to parse revspecs
   *
   * Written by the libgit2 contributors
   *
   * To the extent possible under law, the author(s) have dedicated all copyright
   * and related and neighboring rights to this software to the public domain
   * worldwide. This software is distributed without any warranty.
   *
   * You should have received a copy of the CC0 Public Domain Dedication along
   * with this software. If not, see
   * <http://creativecommons.org/publicdomain/zero/1.0/>.
   */
  
  #include "common.h"
  
  /** Forward declarations for helpers. */
  struct parse_state {
  	const char *repodir;
  	const char *spec;
  	int not;
  };
  static void parse_opts(struct parse_state *ps, int argc, char *argv[]);
  static int parse_revision(git_repository *repo, struct parse_state *ps);
  
  int lg2_rev_parse(git_repository *repo, int argc, char *argv[])
  {
  	struct parse_state ps = {0};
  
  	parse_opts(&ps, argc, argv);
  
  	check_lg2(parse_revision(repo, &ps), "Parsing", NULL);
  
  	return 0;
  }
  
  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: rev-parse [ --option ] <args>...\n");
  	exit(1);
  }
  
  static void parse_opts(struct parse_state *ps, int argc, char *argv[])
  {
  	struct args_info args = ARGS_INFO_INIT;
  
  	for (args.pos=1; args.pos < argc; ++args.pos) {
  		const char *a = argv[args.pos];
  
  		if (a[0] != '-') {
  			if (ps->spec)
  				usage("Too many specs", a);
  			ps->spec = a;
  		} else if (!strcmp(a, "--not"))
  			ps->not = !ps->not;
  		else if (!match_str_arg(&ps->repodir, &args, "--git-dir"))
  			usage("Cannot handle argument", a);
  	}
  }
  
  static int parse_revision(git_repository *repo, struct parse_state *ps)
  {
  	git_revspec rs;
  	char str[GIT_OID_SHA1_HEXSIZE + 1];
  
  	check_lg2(git_revparse(&rs, repo, ps->spec), "Could not parse", ps->spec);
  
  	if ((rs.flags & GIT_REVSPEC_SINGLE) != 0) {
  		git_oid_tostr(str, sizeof(str), git_object_id(rs.from));
  		printf("%s\n", str);
  		git_object_free(rs.from);
  	}
  	else if ((rs.flags & GIT_REVSPEC_RANGE) != 0) {
  		git_oid_tostr(str, sizeof(str), git_object_id(rs.to));
  		printf("%s\n", str);
  		git_object_free(rs.to);
  
  		if ((rs.flags & GIT_REVSPEC_MERGE_BASE) != 0) {
  			git_oid base;
  			check_lg2(git_merge_base(&base, repo,
  						git_object_id(rs.from), git_object_id(rs.to)),
  					"Could not find merge base", ps->spec);
  
  			git_oid_tostr(str, sizeof(str), &base);
  			printf("%s\n", str);
  		}
  
  		git_oid_tostr(str, sizeof(str), git_object_id(rs.from));
  		printf("^%s\n", str);
  		git_object_free(rs.from);
  	}
  	else {
  		fatal("Invalid results from git_revparse", ps->spec);
  	}
  
  	return 0;
  }
  
  

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