examples/lg2.c

   1 #include "common.h"
   2
   3 /* This part is not strictly libgit2-dependent, but you can use this
   4  * as a starting point for a git-like tool */
   5
   6 typedef int (*git_command_fn)(git_repository *, int , char **);
   7
   8 struct {
   9         char *name;
  10         git_command_fn fn;
  11         char requires_repo;
  12 } commands[] = {
  13         { "add",          lg2_add,          1 },
  14         { "blame",        lg2_blame,        1 },
  15         { "cat-file",     lg2_cat_file,     1 },
  16         { "checkout",     lg2_checkout,     1 },
  17         { "clone",        lg2_clone,        0 },
  18         { "config",       lg2_config,       1 },
  19         { "describe",     lg2_describe,     1 },
  20         { "diff",         lg2_diff,         1 },
  21         { "fetch",        lg2_fetch,        1 },
  22         { "for-each-ref", lg2_for_each_ref, 1 },
  23         { "general",      lg2_general,      0 },
  24         { "index-pack",   lg2_index_pack,   1 },
  25         { "init",         lg2_init,         0 },
  26         { "log",          lg2_log,          1 },
  27         { "ls-files",     lg2_ls_files,     1 },
  28         { "ls-remote",    lg2_ls_remote,    1 },
  29         { "merge",        lg2_merge,        1 },
  30         { "remote",       lg2_remote,       1 },
  31         { "rev-list",     lg2_rev_list,     1 },
  32         { "rev-parse",    lg2_rev_parse,    1 },
  33         { "show-index",   lg2_show_index,   0 },
  34         { "stash",        lg2_stash,        1 },
  35         { "status",       lg2_status,       1 },
  36         { "tag",          lg2_tag,          1 },
  37 };
  38
  39 static int run_command(git_command_fn fn, git_repository *repo, struct args_info args)
  40 {
  41         int error;
  42
  43         /* Run the command. If something goes wrong, print the error message to stderr */
  44         error = fn(repo, args.argc - args.pos, &args.argv[args.pos]);
  45         if (error < 0) {
  46                 if (git_error_last() == NULL)
  47                         fprintf(stderr, "Error without message");
  48                 else
  49                         fprintf(stderr, "Bad news:\n %s\n", git_error_last()->message);
  50         }
  51
  52         return !!error;
  53 }
  54
  55 static int usage(const char *prog)
  56 {
  57         size_t i;
  58
  59         fprintf(stderr, "usage: %s <cmd>...\n\nAvailable commands:\n\n", prog);
  60         for (i = 0; i < ARRAY_SIZE(commands); i++)
  61                 fprintf(stderr, "\t%s\n", commands[i].name);
  62
  63         exit(EXIT_FAILURE);
  64 }
  65
  66 int main(int argc, char **argv)
  67 {
  68         struct args_info args = ARGS_INFO_INIT;
  69         git_repository *repo = NULL;
  70         const char *git_dir = NULL;
  71         int return_code = 1;
  72         size_t i;
  73
  74         if (argc < 2)
  75                 usage(argv[0]);
  76
  77         git_libgit2_init();
  78
  79         for (args.pos = 1; args.pos < args.argc; ++args.pos) {
  80                 char *a = args.argv[args.pos];
  81
  82                 if (a[0] != '-') {
  83                         /* non-arg */
  84                         break;
  85                 } else if (optional_str_arg(&git_dir, &args, "--git-dir", ".git")) {
  86                         continue;
  87                 } else if (match_arg_separator(&args)) {
  88                         break;
  89                 }
  90         }
  91
  92         if (args.pos == args.argc)
  93                 usage(argv[0]);
  94
  95         if (!git_dir)
  96                 git_dir = ".";
  97
  98         for (i = 0; i < ARRAY_SIZE(commands); ++i) {
  99                 if (strcmp(args.argv[args.pos], commands[i].name))
 100                         continue;
 101
 102                 /*
 103                  * Before running the actual command, create an instance
 104                  * of the local repository and pass it to the function.
 105                  * */
 106                 if (commands[i].requires_repo) {
 107                         check_lg2(git_repository_open_ext(&repo, git_dir, 0, NULL),
 108                                   "Unable to open repository '%s'", git_dir);
 109                 }
 110
 111                 return_code = run_command(commands[i].fn, repo, args);
 112                 goto shutdown;
 113         }
 114
 115         fprintf(stderr, "Command not found: %s\n", argv[1]);
 116
 117 shutdown:
 118         git_repository_free(repo);
 119         git_libgit2_shutdown();
 120
 121         return return_code;
 122 }