remote.c

/*
 * libgit2 "remote" example - shows how to modify remotes for a repo
 *
 * 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"

enum subcmd {
  subcmd_add,
  subcmd_remove,
  subcmd_rename,
  subcmd_seturl,
  subcmd_show,
};

struct remote_opts {
  enum subcmd cmd;

  /* for command-specific args */
  int argc;
  char **argv;
};

static int cmd_add(git_repository *repo, struct remote_opts *o);
static int cmd_remove(git_repository *repo, struct remote_opts *o);
static int cmd_rename(git_repository *repo, struct remote_opts *o);
static int cmd_seturl(git_repository *repo, struct remote_opts *o);
static int cmd_show(git_repository *repo, struct remote_opts *o);

static void parse_subcmd(
  struct remote_opts *opt, int argc, char **argv);
static void usage(const char *msg, const char *arg);

int lg2_remote(git_repository *repo, int argc, char *argv[])
{
  int retval = 0;
  struct remote_opts opt = {0};

  parse_subcmd(&opt, argc, argv);

  switch (opt.cmd)
  {
  case subcmd_add:
    retval = cmd_add(repo, &opt);
    break;
  case subcmd_remove:
    retval = cmd_remove(repo, &opt);
    break;
  case subcmd_rename:
    retval = cmd_rename(repo, &opt);
    break;
  case subcmd_seturl:
    retval = cmd_seturl(repo, &opt);
    break;
  case subcmd_show:
    retval = cmd_show(repo, &opt);
    break;
  }

  return retval;
}

static int cmd_add(git_repository *repo, struct remote_opts *o)
{
  char *name, *url;
  git_remote *remote = {0};

  if (o->argc != 2)
    usage("you need to specify a name and URL", NULL);

  name = o->argv[0];
  url = o->argv[1];

  check_lg2(git_remote_create(&remote, repo, name, url),
      "could not create remote", NULL);

  return 0;
}

static int cmd_remove(git_repository *repo, struct remote_opts *o)
{
  char *name;

  if (o->argc != 1)
    usage("you need to specify a name", NULL);

  name = o->argv[0];

  check_lg2(git_remote_delete(repo, name),
      "could not delete remote", name);

  return 0;
}

static int cmd_rename(git_repository *repo, struct remote_opts *o)
{
  int i, retval;
  char *old, *new;
  git_strarray problems = {0};

  if (o->argc != 2)
    usage("you need to specify old and new remote name", NULL);

  old = o->argv[0];
  new = o->argv[1];

  retval = git_remote_rename(&problems, repo, old, new);
  if (!retval)
    return 0;

  for (i = 0; i < (int) problems.count; i++) {
    puts(problems.strings[0]);
  }

  git_strarray_free(&problems);

  return retval;
}

static int cmd_seturl(git_repository *repo, struct remote_opts *o)
{
  int i, retval, push = 0;
  char *name = NULL, *url = NULL;

  for (i = 0; i < o->argc; i++) {
    char *arg = o->argv[i];

    if (!strcmp(arg, "--push")) {
      push = 1;
    } else if (arg[0] != '-' && name == NULL) {
      name = arg;
    } else if (arg[0] != '-' && url == NULL) {
      url = arg;
    } else {
      usage("invalid argument to set-url", arg);
    }
  }

  if (name == NULL || url == NULL)
    usage("you need to specify remote and the new URL", NULL);

  if (push)
    retval = git_remote_set_pushurl(repo, name, url);
  else
    retval = git_remote_set_url(repo, name, url);

  check_lg2(retval, "could not set URL", url);

  return 0;
}

static int cmd_show(git_repository *repo, struct remote_opts *o)
{
  int i;
  const char *arg, *name, *fetch, *push;
  int verbose = 0;
  git_strarray remotes = {0};
  git_remote *remote = {0};

  for (i = 0; i < o->argc; i++) {
    arg = o->argv[i];

    if (!strcmp(arg, "-v") || !strcmp(arg, "--verbose")) {
      verbose = 1;
    }
  }

  check_lg2(git_remote_list(&remotes, repo),
    "could not retrieve remotes", NULL);

  for (i = 0; i < (int) remotes.count; i++) {
    name = remotes.strings[i];
    if (!verbose) {
      puts(name);
      continue;
    }

    check_lg2(git_remote_lookup(&remote, repo, name),
      "could not look up remote", name);

    fetch = git_remote_url(remote);
    if (fetch)
      printf("%s\t%s (fetch)\n", name, fetch);
    push = git_remote_pushurl(remote);
    /* use fetch URL if no distinct push URL has been set */
    push = push ? push : fetch;
    if (push)
      printf("%s\t%s (push)\n", name, push);

    git_remote_free(remote);
  }

  git_strarray_free(&remotes);

  return 0;
}

static void parse_subcmd(
  struct remote_opts *opt, int argc, char **argv)
{
  char *arg = argv[1];
  enum subcmd cmd = 0;

  if (argc < 2)
    usage("no command specified", NULL);

  if (!strcmp(arg, "add")) {
    cmd = subcmd_add;
  } else if (!strcmp(arg, "remove")) {
    cmd = subcmd_remove;
  } else if (!strcmp(arg, "rename")) {
    cmd = subcmd_rename;
  } else if (!strcmp(arg, "set-url")) {
    cmd = subcmd_seturl;
  } else if (!strcmp(arg, "show")) {
    cmd = subcmd_show;
  } else {
    usage("command is not valid", arg);
  }
  opt->cmd = cmd;

  opt->argc = argc - 2; /* executable and subcommand are removed */
  opt->argv = argv + 2;
}

static void usage(const char *msg, const char *arg)
{
  fputs("usage: remote add <name> <url>\n", stderr);
  fputs("       remote remove <name>\n", stderr);
  fputs("       remote rename <old> <new>\n", stderr);
  fputs("       remote set-url [--push] <name> <newurl>\n", stderr);
  fputs("       remote show [-v|--verbose]\n", stderr);

  if (msg && !arg)
    fprintf(stderr, "\n%s\n", msg);
  else if (msg && arg)
    fprintf(stderr, "\n%s: %s\n", msg, arg);
  exit(1);
}