builtin/var.c

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