builtin-var.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Eric Biederman, 2005
   5  */
   6 #include "cache.h"
   7 #include "exec_cmd.h"
   8
   9 static const char var_usage[] = "git var (-l | <variable>)";
  10
  11 static const char *editor(int flag)
  12 {
  13         const char *pgm = git_editor();
  14
  15         if (!pgm && flag & IDENT_ERROR_ON_NO_NAME)
  16                 die("Terminal is dumb, but EDITOR unset");
  17
  18         return pgm;
  19 }
  20
  21 static const char *pager(int flag)
  22 {
  23         const char *pgm = git_pager(1);
  24
  25         if (!pgm)
  26                 pgm = "cat";
  27         return pgm;
  28 }
  29
  30 struct git_var {
  31         const char *name;
  32         const char *(*read)(int);
  33 };
  34 static struct git_var git_vars[] = {
  35         { "GIT_COMMITTER_IDENT", git_committer_info },
  36         { "GIT_AUTHOR_IDENT",   git_author_info },
  37         { "GIT_EDITOR", editor },
  38         { "GIT_PAGER", pager },
  39         { "", NULL },
  40 };
  41
  42 static void list_vars(void)
  43 {
  44         struct git_var *ptr;
  45         const char *val;
  46
  47         for (ptr = git_vars; ptr->read; ptr++)
  48                 if ((val = ptr->read(0)))
  49                         printf("%s=%s\n", ptr->name, val);
  50 }
  51
  52 static const char *read_var(const char *var)
  53 {
  54         struct git_var *ptr;
  55         const char *val;
  56         val = NULL;
  57         for (ptr = git_vars; ptr->read; ptr++) {
  58                 if (strcmp(var, ptr->name) == 0) {
  59                         val = ptr->read(IDENT_ERROR_ON_NO_NAME);
  60                         break;
  61                 }
  62         }
  63         return val;
  64 }
  65
  66 static int show_config(const char *var, const char *value, void *cb)
  67 {
  68         if (value)
  69                 printf("%s=%s\n", var, value);
  70         else
  71                 printf("%s\n", var);
  72         return git_default_config(var, value, cb);
  73 }
  74
  75 int cmd_var(int argc, const char **argv, const char *prefix)
  76 {
  77         const char *val;
  78         int nongit;
  79         if (argc != 2) {
  80                 usage(var_usage);
  81         }
  82
  83         setup_git_directory_gently(&nongit);
  84         val = NULL;
  85
  86         if (strcmp(argv[1], "-l") == 0) {
  87                 git_config(show_config, NULL);
  88                 list_vars();
  89                 return 0;
  90         }
  91         git_config(git_default_config, NULL);
  92         val = read_var(argv[1]);
  93         if (!val)
  94                 usage(var_usage);
  95
  96         printf("%s\n", val);
  97
  98         return 0;
  99 }