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 "ident.h"
   9 #include "refs.h"
  10
  11 static const char var_usage[] = "git var (-l | <variable>)";
  12
  13 static const char *editor(int flag)
  14 {
  15         return git_editor();
  16 }
  17
  18 static const char *sequence_editor(int flag)
  19 {
  20         return git_sequence_editor();
  21 }
  22
  23 static const char *pager(int flag)
  24 {
  25         const char *pgm = git_pager(1);
  26
  27         if (!pgm)
  28                 pgm = "cat";
  29         return pgm;
  30 }
  31
  32 static const char *default_branch(int flag)
  33 {
  34         return git_default_branch_name(1);
  35 }
  36
  37 struct git_var {
  38         const char *name;
  39         const char *(*read)(int);
  40 };
  41 static struct git_var git_vars[] = {
  42         { "GIT_COMMITTER_IDENT", git_committer_info },
  43         { "GIT_AUTHOR_IDENT",   git_author_info },
  44         { "GIT_EDITOR", editor },
  45         { "GIT_SEQUENCE_EDITOR", sequence_editor },
  46         { "GIT_PAGER", pager },
  47         { "GIT_DEFAULT_BRANCH", default_branch },
  48         { "", NULL },
  49 };
  50
  51 static void list_vars(void)
  52 {
  53         struct git_var *ptr;
  54         const char *val;
  55
  56         for (ptr = git_vars; ptr->read; ptr++)
  57                 if ((val = ptr->read(0)))
  58                         printf("%s=%s\n", ptr->name, val);
  59 }
  60
  61 static const struct git_var *get_git_var(const char *var)
  62 {
  63         struct git_var *ptr;
  64         for (ptr = git_vars; ptr->read; ptr++) {
  65                 if (strcmp(var, ptr->name) == 0) {
  66                         return ptr;
  67                 }
  68         }
  69         return NULL;
  70 }
  71
  72 static int show_config(const char *var, const char *value, void *cb)
  73 {
  74         if (value)
  75                 printf("%s=%s\n", var, value);
  76         else
  77                 printf("%s\n", var);
  78         return git_default_config(var, value, cb);
  79 }
  80
  81 int cmd_var(int argc, const char **argv, const char *prefix)
  82 {
  83         const struct git_var *git_var;
  84         const char *val;
  85
  86         if (argc != 2)
  87                 usage(var_usage);
  88
  89         if (strcmp(argv[1], "-l") == 0) {
  90                 git_config(show_config, NULL);
  91                 list_vars();
  92                 return 0;
  93         }
  94         git_config(git_default_config, NULL);
  95
  96         git_var = get_git_var(argv[1]);
  97         if (!git_var)
  98                 usage(var_usage);
  99
 100         val = git_var->read(IDENT_STRICT);
 101         if (!val)
 102                 return 1;
 103
 104         printf("%s\n", val);
 105
 106         return 0;
 107 }