refactor "dumb" terminal determination
[git/git.git] / editor.c
CommitLineData
d82f33e2
SB
1#include "cache.h"
2#include "strbuf.h"
3#include "run-command.h"
913ef360 4#include "sigchain.h"
d82f33e2 5
8f4b576a
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6#ifndef DEFAULT_EDITOR
7#define DEFAULT_EDITOR "vi"
8#endif
9
a64f213d
LS
10int is_terminal_dumb(void)
11{
12 const char *terminal = getenv("TERM");
13 return !terminal || !strcmp(terminal, "dumb");
14}
15
44fcb497 16const char *git_editor(void)
d82f33e2 17{
d33738d7 18 const char *editor = getenv("GIT_EDITOR");
a64f213d 19 int terminal_is_dumb = is_terminal_dumb();
d82f33e2 20
d82f33e2
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21 if (!editor && editor_program)
22 editor = editor_program;
d33738d7 23 if (!editor && !terminal_is_dumb)
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24 editor = getenv("VISUAL");
25 if (!editor)
26 editor = getenv("EDITOR");
27
d33738d7 28 if (!editor && terminal_is_dumb)
44fcb497 29 return NULL;
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30
31 if (!editor)
8f4b576a 32 editor = DEFAULT_EDITOR;
d82f33e2 33
44fcb497
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34 return editor;
35}
36
37int launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
38{
39 const char *editor = git_editor();
40
41 if (!editor)
42 return error("Terminal is dumb, but EDITOR unset");
43
d82f33e2 44 if (strcmp(editor, ":")) {
09c5ae5a 45 const char *args[] = { editor, real_path(path), NULL };
d3180279 46 struct child_process p = CHILD_PROCESS_INIT;
1250857c 47 int ret, sig;
d82f33e2 48
f42ca31d
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49 p.argv = args;
50 p.env = env;
51 p.use_shell = 1;
52 if (start_command(&p) < 0)
53 return error("unable to start editor '%s'", editor);
54
913ef360
PF
55 sigchain_push(SIGINT, SIG_IGN);
56 sigchain_push(SIGQUIT, SIG_IGN);
57 ret = finish_command(&p);
709ca730 58 sig = ret - 128;
913ef360
PF
59 sigchain_pop(SIGINT);
60 sigchain_pop(SIGQUIT);
1250857c
JK
61 if (sig == SIGINT || sig == SIGQUIT)
62 raise(sig);
913ef360 63 if (ret)
7198203a
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64 return error("There was a problem with the editor '%s'.",
65 editor);
d82f33e2
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66 }
67
68 if (!buffer)
7198203a 69 return 0;
d82f33e2 70 if (strbuf_read_file(buffer, path, 0) < 0)
9f9a522c 71 return error_errno("could not read file '%s'", path);
7198203a 72 return 0;
d82f33e2 73}