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 "editor.h"
   9 #include "ident.h"
  10 #include "pager.h"
  11 #include "refs.h"
  12
  13 static const char var_usage[] = "git var (-l | <variable>)";
  14
  15 static const char *editor(int flag)
  16 {
  17         return git_editor();
  18 }
  19
  20 static const char *sequence_editor(int flag)
  21 {
  22         return git_sequence_editor();
  23 }
  24
  25 static const char *pager(int flag)
  26 {
  27         const char *pgm = git_pager(1);
  28
  29         if (!pgm)
  30                 pgm = "cat";
  31         return pgm;
  32 }
  33
  34 static const char *default_branch(int flag)
  35 {
  36         return git_default_branch_name(1);
  37 }
  38
  39 struct git_var {
  40         const char *name;
  41         const char *(*read)(int);
  42 };
  43 static struct git_var git_vars[] = {
  44         { "GIT_COMMITTER_IDENT", git_committer_info },
  45         { "GIT_AUTHOR_IDENT",   git_author_info },
  46         { "GIT_EDITOR", editor },
  47         { "GIT_SEQUENCE_EDITOR", sequence_editor },
  48         { "GIT_PAGER", pager },
  49         { "GIT_DEFAULT_BRANCH", default_branch },
  50         { "", NULL },
  51 };
  52
  53 static void list_vars(void)
  54 {
  55         struct git_var *ptr;
  56         const char *val;
  57
  58         for (ptr = git_vars; ptr->read; ptr++)
  59                 if ((val = ptr->read(0)))
  60                         printf("%s=%s\n", ptr->name, val);
  61 }
  62
  63 static const struct git_var *get_git_var(const char *var)
  64 {
  65         struct git_var *ptr;
  66         for (ptr = git_vars; ptr->read; ptr++) {
  67                 if (strcmp(var, ptr->name) == 0) {
  68                         return ptr;
  69                 }
  70         }
  71         return NULL;
  72 }
  73
  74 static int show_config(const char *var, const char *value, void *cb)
  75 {
  76         if (value)
  77                 printf("%s=%s\n", var, value);
  78         else
  79                 printf("%s\n", var);
  80         return git_default_config(var, value, cb);
  81 }
  82
  83 int cmd_var(int argc, const char **argv, const char *prefix)
  84 {
  85         const struct git_var *git_var;
  86         const char *val;
  87
  88         if (argc != 2)
  89                 usage(var_usage);
  90
  91         if (strcmp(argv[1], "-l") == 0) {
  92                 git_config(show_config, NULL);
  93                 list_vars();
  94                 return 0;
  95         }
  96         git_config(git_default_config, NULL);
  97
  98         git_var = get_git_var(argv[1]);
  99         if (!git_var)
 100                 usage(var_usage);
 101
 102         val = git_var->read(IDENT_STRICT);
 103         if (!val)
 104                 return 1;
 105
 106         printf("%s\n", val);
 107
 108         return 0;
 109 }