fix git-p4 editor invocation
[git/git.git] / 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();
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 main(int argc, char **argv)
76 {
77 const char *val;
78 int nongit;
79 if (argc != 2) {
80 usage(var_usage);
81 }
82
83 git_extract_argv0_path(argv[0]);
84
85 setup_git_directory_gently(&nongit);
86 val = NULL;
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 val = read_var(argv[1]);
95 if (!val)
96 usage(var_usage);
97
98 printf("%s\n", val);
99
100 return 0;
101 }