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 "config.h"
   8 #include "refs.h"
   9
  10 static const char var_usage[] = "git var (-l | <variable>)";
  11
  12 static const char *editor(int flag)
  13 {
  14         const char *pgm = git_editor();
  15
  16         if (!pgm && flag & IDENT_STRICT)
  17                 die("Terminal is dumb, but EDITOR unset");
  18
  19         return pgm;
  20 }
  21
  22 static const char *pager(int flag)
  23 {
  24         const char *pgm = git_pager(1);
  25
  26         if (!pgm)
  27                 pgm = "cat";
  28         return pgm;
  29 }
  30
  31 static const char *default_branch(int flag)
  32 {
  33         return git_default_branch_name(1);
  34 }
  35
  36 struct git_var {
  37         const char *name;
  38         const char *(*read)(int);
  39 };
  40 static struct git_var git_vars[] = {
  41         { "GIT_COMMITTER_IDENT", git_committer_info },
  42         { "GIT_AUTHOR_IDENT",   git_author_info },
  43         { "GIT_EDITOR", editor },
  44         { "GIT_PAGER", pager },
  45         { "GIT_DEFAULT_BRANCH", default_branch },
  46         { "", NULL },
  47 };
  48
  49 static void list_vars(void)
  50 {
  51         struct git_var *ptr;
  52         const char *val;
  53
  54         for (ptr = git_vars; ptr->read; ptr++)
  55                 if ((val = ptr->read(0)))
  56                         printf("%s=%s\n", ptr->name, val);
  57 }
  58
  59 static const char *read_var(const char *var)
  60 {
  61         struct git_var *ptr;
  62         const char *val;
  63         val = NULL;
  64         for (ptr = git_vars; ptr->read; ptr++) {
  65                 if (strcmp(var, ptr->name) == 0) {
  66                         val = ptr->read(IDENT_STRICT);
  67                         break;
  68                 }
  69         }
  70         return val;
  71 }
  72
  73 static int show_config(const char *var, const char *value, void *cb)
  74 {
  75         if (value)
  76                 printf("%s=%s\n", var, value);
  77         else
  78                 printf("%s\n", var);
  79         return git_default_config(var, value, cb);
  80 }
  81
  82 int cmd_var(int argc, const char **argv, const char *prefix)
  83 {
  84         const char *val = NULL;
  85         if (argc != 2)
  86                 usage(var_usage);
  87
  88         if (strcmp(argv[1], "-l") == 0) {
  89                 git_config(show_config, NULL);
  90                 list_vars();
  91                 return 0;
  92         }
  93         git_config(git_default_config, NULL);
  94         val = read_var(argv[1]);
  95         if (!val)
  96                 usage(var_usage);
  97
  98         printf("%s\n", val);
  99
 100         return 0;
 101 }