Merge branch 'jc/remove-treesame-parent-in-simplify-merges'
[git] / editor.c
1 #include "cache.h"
2 #include "strbuf.h"
3 #include "run-command.h"
4 #include "sigchain.h"
5
6 #ifndef DEFAULT_EDITOR
7 #define DEFAULT_EDITOR "vi"
8 #endif
9
10 const char *git_editor(void)
11 {
12         const char *editor = getenv("GIT_EDITOR");
13         const char *terminal = getenv("TERM");
14         int terminal_is_dumb = !terminal || !strcmp(terminal, "dumb");
15
16         if (!editor && editor_program)
17                 editor = editor_program;
18         if (!editor && !terminal_is_dumb)
19                 editor = getenv("VISUAL");
20         if (!editor)
21                 editor = getenv("EDITOR");
22
23         if (!editor && terminal_is_dumb)
24                 return NULL;
25
26         if (!editor)
27                 editor = DEFAULT_EDITOR;
28
29         return editor;
30 }
31
32 int launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
33 {
34         const char *editor = git_editor();
35
36         if (!editor)
37                 return error("Terminal is dumb, but EDITOR unset");
38
39         if (strcmp(editor, ":")) {
40                 const char *args[] = { editor, path, NULL };
41                 struct child_process p;
42                 int ret, sig;
43
44                 memset(&p, 0, sizeof(p));
45                 p.argv = args;
46                 p.env = env;
47                 p.use_shell = 1;
48                 if (start_command(&p) < 0)
49                         return error("unable to start editor '%s'", editor);
50
51                 sigchain_push(SIGINT, SIG_IGN);
52                 sigchain_push(SIGQUIT, SIG_IGN);
53                 ret = finish_command(&p);
54                 sig = ret - 128;
55                 sigchain_pop(SIGINT);
56                 sigchain_pop(SIGQUIT);
57                 if (sig == SIGINT || sig == SIGQUIT)
58                         raise(sig);
59                 if (ret)
60                         return error("There was a problem with the editor '%s'.",
61                                         editor);
62         }
63
64         if (!buffer)
65                 return 0;
66         if (strbuf_read_file(buffer, path, 0) < 0)
67                 return error("could not read file '%s': %s",
68                                 path, strerror(errno));
69         return 0;
70 }