builtin/var.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Eric Biederman, 2005
   5  */
   6 #include "builtin.h"
   7 #include "attr.h"
   8 #include "config.h"
   9 #include "editor.h"
  10 #include "ident.h"
  11 #include "pager.h"
  12 #include "refs.h"
  13 #include "path.h"
  14 #include "strbuf.h"
  15
  16 static const char var_usage[] = "git var (-l | <variable>)";
  17
  18 static char *committer(int ident_flag)
  19 {
  20         return xstrdup_or_null(git_committer_info(ident_flag));
  21 }
  22
  23 static char *author(int ident_flag)
  24 {
  25         return xstrdup_or_null(git_author_info(ident_flag));
  26 }
  27
  28 static char *editor(int ident_flag UNUSED)
  29 {
  30         return xstrdup_or_null(git_editor());
  31 }
  32
  33 static char *sequence_editor(int ident_flag UNUSED)
  34 {
  35         return xstrdup_or_null(git_sequence_editor());
  36 }
  37
  38 static char *pager(int ident_flag UNUSED)
  39 {
  40         const char *pgm = git_pager(1);
  41
  42         if (!pgm)
  43                 pgm = "cat";
  44         return xstrdup(pgm);
  45 }
  46
  47 static char *default_branch(int ident_flag UNUSED)
  48 {
  49         return xstrdup_or_null(git_default_branch_name(1));
  50 }
  51
  52 static char *shell_path(int ident_flag UNUSED)
  53 {
  54         return xstrdup(SHELL_PATH);
  55 }
  56
  57 static char *git_attr_val_system(int ident_flag UNUSED)
  58 {
  59         if (git_attr_system_is_enabled()) {
  60                 char *file = xstrdup(git_attr_system_file());
  61                 normalize_path_copy(file, file);
  62                 return file;
  63         }
  64         return NULL;
  65 }
  66
  67 static char *git_attr_val_global(int ident_flag UNUSED)
  68 {
  69         char *file = xstrdup_or_null(git_attr_global_file());
  70         if (file) {
  71                 normalize_path_copy(file, file);
  72                 return file;
  73         }
  74         return NULL;
  75 }
  76
  77 static char *git_config_val_system(int ident_flag UNUSED)
  78 {
  79         if (git_config_system()) {
  80                 char *file = git_system_config();
  81                 normalize_path_copy(file, file);
  82                 return file;
  83         }
  84         return NULL;
  85 }
  86
  87 static char *git_config_val_global(int ident_flag UNUSED)
  88 {
  89         struct strbuf buf = STRBUF_INIT;
  90         char *user, *xdg;
  91         size_t unused;
  92
  93         git_global_config(&user, &xdg);
  94         if (xdg && *xdg) {
  95                 normalize_path_copy(xdg, xdg);
  96                 strbuf_addf(&buf, "%s\n", xdg);
  97         }
  98         if (user && *user) {
  99                 normalize_path_copy(user, user);
 100                 strbuf_addf(&buf, "%s\n", user);
 101         }
 102         free(xdg);
 103         free(user);
 104         strbuf_trim_trailing_newline(&buf);
 105         if (buf.len == 0) {
 106                 strbuf_release(&buf);
 107                 return NULL;
 108         }
 109         return strbuf_detach(&buf, &unused);
 110 }
 111
 112 struct git_var {
 113         const char *name;
 114         char *(*read)(int);
 115         int multivalued;
 116 };
 117 static struct git_var git_vars[] = {
 118         {
 119                 .name = "GIT_COMMITTER_IDENT",
 120                 .read = committer,
 121         },
 122         {
 123                 .name = "GIT_AUTHOR_IDENT",
 124                 .read = author,
 125         },
 126         {
 127                 .name = "GIT_EDITOR",
 128                 .read = editor,
 129         },
 130         {
 131                 .name = "GIT_SEQUENCE_EDITOR",
 132                 .read = sequence_editor,
 133         },
 134         {
 135                 .name = "GIT_PAGER",
 136                 .read = pager,
 137         },
 138         {
 139                 .name = "GIT_DEFAULT_BRANCH",
 140                 .read = default_branch,
 141         },
 142         {
 143                 .name = "GIT_SHELL_PATH",
 144                 .read = shell_path,
 145         },
 146         {
 147                 .name = "GIT_ATTR_SYSTEM",
 148                 .read = git_attr_val_system,
 149         },
 150         {
 151                 .name = "GIT_ATTR_GLOBAL",
 152                 .read = git_attr_val_global,
 153         },
 154         {
 155                 .name = "GIT_CONFIG_SYSTEM",
 156                 .read = git_config_val_system,
 157         },
 158         {
 159                 .name = "GIT_CONFIG_GLOBAL",
 160                 .read = git_config_val_global,
 161                 .multivalued = 1,
 162         },
 163         {
 164                 .name = "",
 165                 .read = NULL,
 166         },
 167 };
 168
 169 static void list_vars(void)
 170 {
 171         struct git_var *ptr;
 172         char *val;
 173
 174         for (ptr = git_vars; ptr->read; ptr++)
 175                 if ((val = ptr->read(0))) {
 176                         if (ptr->multivalued && *val) {
 177                                 struct string_list list = STRING_LIST_INIT_DUP;
 178                                 int i;
 179
 180                                 string_list_split(&list, val, '\n', -1);
 181                                 for (i = 0; i < list.nr; i++)
 182                                         printf("%s=%s\n", ptr->name, list.items[i].string);
 183                                 string_list_clear(&list, 0);
 184                         } else {
 185                                 printf("%s=%s\n", ptr->name, val);
 186                         }
 187                         free(val);
 188                 }
 189 }
 190
 191 static const struct git_var *get_git_var(const char *var)
 192 {
 193         struct git_var *ptr;
 194         for (ptr = git_vars; ptr->read; ptr++) {
 195                 if (strcmp(var, ptr->name) == 0) {
 196                         return ptr;
 197                 }
 198         }
 199         return NULL;
 200 }
 201
 202 static int show_config(const char *var, const char *value,
 203                        const struct config_context *ctx, void *cb)
 204 {
 205         if (value)
 206                 printf("%s=%s\n", var, value);
 207         else
 208                 printf("%s\n", var);
 209         return git_default_config(var, value, ctx, cb);
 210 }
 211
 212 int cmd_var(int argc, const char **argv, const char *prefix UNUSED)
 213 {
 214         const struct git_var *git_var;
 215         char *val;
 216
 217         if (argc != 2)
 218                 usage(var_usage);
 219
 220         if (strcmp(argv[1], "-l") == 0) {
 221                 git_config(show_config, NULL);
 222                 list_vars();
 223                 return 0;
 224         }
 225         git_config(git_default_config, NULL);
 226
 227         git_var = get_git_var(argv[1]);
 228         if (!git_var)
 229                 usage(var_usage);
 230
 231         val = git_var->read(IDENT_STRICT);
 232         if (!val)
 233                 return 1;
 234
 235         printf("%s\n", val);
 236         free(val);
 237
 238         return 0;
 239 }