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         return git_editor();
  15 }
  16
  17 static const char *sequence_editor(int flag)
  18 {
  19         return git_sequence_editor();
  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_SEQUENCE_EDITOR", sequence_editor },
  45         { "GIT_PAGER", pager },
  46         { "GIT_DEFAULT_BRANCH", default_branch },
  47         { "", NULL },
  48 };
  49
  50 static void list_vars(void)
  51 {
  52         struct git_var *ptr;
  53         const char *val;
  54
  55         for (ptr = git_vars; ptr->read; ptr++)
  56                 if ((val = ptr->read(0)))
  57                         printf("%s=%s\n", ptr->name, val);
  58 }
  59
  60 static const struct git_var *get_git_var(const char *var)
  61 {
  62         struct git_var *ptr;
  63         for (ptr = git_vars; ptr->read; ptr++) {
  64                 if (strcmp(var, ptr->name) == 0) {
  65                         return ptr;
  66                 }
  67         }
  68         return NULL;
  69 }
  70
  71 static int show_config(const char *var, const char *value, void *cb)
  72 {
  73         if (value)
  74                 printf("%s=%s\n", var, value);
  75         else
  76                 printf("%s\n", var);
  77         return git_default_config(var, value, cb);
  78 }
  79
  80 int cmd_var(int argc, const char **argv, const char *prefix)
  81 {
  82         const struct git_var *git_var;
  83         const char *val;
  84
  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
  95         git_var = get_git_var(argv[1]);
  96         if (!git_var)
  97                 usage(var_usage);
  98
  99         val = git_var->read(IDENT_STRICT);
 100         if (!val)
 101                 return 1;
 102
 103         printf("%s\n", val);
 104
 105         return 0;
 106 }