/*

 * GIT - The information manager from hell

 *

 * Copyright (C) Eric Biederman, 2005

 */

#include "builtin.h"

#include "attr.h"

#include "config.h"

#include "editor.h"

#include "ident.h"

#include "pager.h"

#include "refs.h"

#include "path.h"

#include "strbuf.h"

#include "run-command.h"

static const char var_usage[] = "git var (-l | <variable>)";

static char *committer(int ident_flag)

{

  return xstrdup_or_null(git_committer_info(ident_flag));

}

static char *author(int ident_flag)

{

  return xstrdup_or_null(git_author_info(ident_flag));

}

static char *editor(int ident_flag UNUSED)

{

  return xstrdup_or_null(git_editor());

}

static char *sequence_editor(int ident_flag UNUSED)

{

  return xstrdup_or_null(git_sequence_editor());

}

static char *pager(int ident_flag UNUSED)

{

  const char *pgm = git_pager(1);

  if (!pgm)

    pgm = "cat";

  return xstrdup(pgm);

}

static char *default_branch(int ident_flag UNUSED)

{

  return repo_default_branch_name(the_repository, 1);

}

static char *shell_path(int ident_flag UNUSED)

{

  return git_shell_path();

}

static char *git_attr_val_system(int ident_flag UNUSED)

{

  if (git_attr_system_is_enabled()) {

    char *file = xstrdup(git_attr_system_file());

    normalize_path_copy(file, file);

    return file;

  }

  return NULL;

}

static char *git_attr_val_global(int ident_flag UNUSED)

{

  char *file = xstrdup_or_null(git_attr_global_file());

  if (file) {

    normalize_path_copy(file, file);

    return file;

  }

  return NULL;

}

static char *git_config_val_system(int ident_flag UNUSED)

{

  if (git_config_system()) {

    char *file = git_system_config();

    normalize_path_copy(file, file);

    return file;

  }

  return NULL;

}

static char *git_config_val_global(int ident_flag UNUSED)

{

  struct strbuf buf = STRBUF_INIT;

  char *user, *xdg;

  size_t unused;

  git_global_config_paths(&user, &xdg);

  if (xdg && *xdg) {

    normalize_path_copy(xdg, xdg);

    strbuf_addf(&buf, "%s\n", xdg);

  }

  if (user && *user) {

    normalize_path_copy(user, user);

    strbuf_addf(&buf, "%s\n", user);

  }

  free(xdg);

  free(user);

  strbuf_trim_trailing_newline(&buf);

  if (buf.len == 0) {

    strbuf_release(&buf);

    return NULL;

  }

  return strbuf_detach(&buf, &unused);

}

struct git_var {

  const char *name;

  char *(*read)(int);

  int multivalued;

};

static struct git_var git_vars[] = {

  {

    .name = "GIT_COMMITTER_IDENT",

    .read = committer,

  },

  {

    .name = "GIT_AUTHOR_IDENT",

    .read = author,

  },

  {

    .name = "GIT_EDITOR",

    .read = editor,

  },

  {

    .name = "GIT_SEQUENCE_EDITOR",

    .read = sequence_editor,

  },

  {

    .name = "GIT_PAGER",

    .read = pager,

  },

  {

    .name = "GIT_DEFAULT_BRANCH",

    .read = default_branch,

  },

  {

    .name = "GIT_SHELL_PATH",

    .read = shell_path,

  },

  {

    .name = "GIT_ATTR_SYSTEM",

    .read = git_attr_val_system,

  },

  {

    .name = "GIT_ATTR_GLOBAL",

    .read = git_attr_val_global,

  },

  {

    .name = "GIT_CONFIG_SYSTEM",

    .read = git_config_val_system,

  },

  {

    .name = "GIT_CONFIG_GLOBAL",

    .read = git_config_val_global,

    .multivalued = 1,

  },

  {

    .name = "",

    .read = NULL,

  },

};

static void list_vars(void)

{

  struct git_var *ptr;

  char *val;

  for (ptr = git_vars; ptr->read; ptr++)

    if ((val = ptr->read(0))) {

      if (ptr->multivalued && *val) {

        struct string_list list = STRING_LIST_INIT_DUP;

        int i;

        string_list_split(&list, val, '\n', -1);

        for (i = 0; i < list.nr; i++)

          printf("%s=%s\n", ptr->name, list.items[i].string);

        string_list_clear(&list, 0);

      } else {

        printf("%s=%s\n", ptr->name, val);

      }

      free(val);

    }

}

static const struct git_var *get_git_var(const char *var)

{

  struct git_var *ptr;

  for (ptr = git_vars; ptr->read; ptr++) {

    if (strcmp(var, ptr->name) == 0) {

      return ptr;

    }

  }

  return NULL;

}

static int show_config(const char *var, const char *value,

           const struct config_context *ctx, void *cb)

{

  if (value)

    printf("%s=%s\n", var, value);

  else

    printf("%s\n", var);

  return git_default_config(var, value, ctx, cb);

}

int cmd_var(int argc, const char **argv, const char *prefix UNUSED)

{

  const struct git_var *git_var;

  char *val;

  if (argc != 2)

    usage(var_usage);

  if (strcmp(argv[1], "-l") == 0) {

    git_config(show_config, NULL);

    list_vars();

    return 0;

  }

  git_config(git_default_config, NULL);

  git_var = get_git_var(argv[1]);

  if (!git_var)

    usage(var_usage);

  val = git_var->read(IDENT_STRICT);

  if (!val)

    return 1;

  printf("%s\n", val);

  free(val);

  return 0;

}