rebase --root: fix amending root commit messages
[git.git] / editor.c
blob9a9b4e12d1db7f8ec2f4f99d9a5f348b680cecc3
1 #include "cache.h"
2 #include "strbuf.h"
3 #include "run-command.h"
4 #include "sigchain.h"
6 #ifndef DEFAULT_EDITOR
7 #define DEFAULT_EDITOR "vi"
8 #endif
10 int is_terminal_dumb(void)
12 const char *terminal = getenv("TERM");
13 return !terminal || !strcmp(terminal, "dumb");
16 const char *git_editor(void)
18 const char *editor = getenv("GIT_EDITOR");
19 int terminal_is_dumb = is_terminal_dumb();
21 if (!editor && editor_program)
22 editor = editor_program;
23 if (!editor && !terminal_is_dumb)
24 editor = getenv("VISUAL");
25 if (!editor)
26 editor = getenv("EDITOR");
28 if (!editor && terminal_is_dumb)
29 return NULL;
31 if (!editor)
32 editor = DEFAULT_EDITOR;
34 return editor;
37 int launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
39 const char *editor = git_editor();
41 if (!editor)
42 return error("Terminal is dumb, but EDITOR unset");
44 if (strcmp(editor, ":")) {
45 const char *args[] = { editor, real_path(path), NULL };
46 struct child_process p = CHILD_PROCESS_INIT;
47 int ret, sig;
48 int print_waiting_for_editor = advice_waiting_for_editor && isatty(2);
50 if (print_waiting_for_editor) {
52 * A dumb terminal cannot erase the line later on. Add a
53 * newline to separate the hint from subsequent output.
55 * Make sure that our message is separated with a whitespace
56 * from further cruft that may be written by the editor.
58 const char term = is_terminal_dumb() ? '\n' : ' ';
60 fprintf(stderr,
61 _("hint: Waiting for your editor to close the file...%c"),
62 term);
63 fflush(stderr);
66 p.argv = args;
67 p.env = env;
68 p.use_shell = 1;
69 if (start_command(&p) < 0)
70 return error("unable to start editor '%s'", editor);
72 sigchain_push(SIGINT, SIG_IGN);
73 sigchain_push(SIGQUIT, SIG_IGN);
74 ret = finish_command(&p);
75 sig = ret - 128;
76 sigchain_pop(SIGINT);
77 sigchain_pop(SIGQUIT);
78 if (sig == SIGINT || sig == SIGQUIT)
79 raise(sig);
80 if (ret)
81 return error("There was a problem with the editor '%s'.",
82 editor);
84 if (print_waiting_for_editor && !is_terminal_dumb())
86 * Go back to the beginning and erase the entire line to
87 * avoid wasting the vertical space.
89 fputs("\r\033[K", stderr);
92 if (!buffer)
93 return 0;
94 if (strbuf_read_file(buffer, path, 0) < 0)
95 return error_errno("could not read file '%s'", path);
96 return 0;