summaryrefslogtreecommitdiff
path: root/editor.c
blob: 674309eed8bd358e4ccc5020f45457215bef290a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
#include "cache.h"
#include "config.h"
#include "strbuf.h"
#include "run-command.h"
#include "sigchain.h"
#include "compat/terminal.h"

#ifndef DEFAULT_EDITOR
#define DEFAULT_EDITOR "vi"
#endif

int is_terminal_dumb(void)
{
	const char *terminal = getenv("TERM");
	return !terminal || !strcmp(terminal, "dumb");
}

const char *git_editor(void)
{
	const char *editor = getenv("GIT_EDITOR");
	int terminal_is_dumb = is_terminal_dumb();

	if (!editor && editor_program)
		editor = editor_program;
	if (!editor && !terminal_is_dumb)
		editor = getenv("VISUAL");
	if (!editor)
		editor = getenv("EDITOR");

	if (!editor && terminal_is_dumb)
		return NULL;

	if (!editor)
		editor = DEFAULT_EDITOR;

	return editor;
}

const char *git_sequence_editor(void)
{
	const char *editor = getenv("GIT_SEQUENCE_EDITOR");

	if (!editor)
		git_config_get_string_tmp("sequence.editor", &editor);
	if (!editor)
		editor = git_editor();

	return editor;
}

static int launch_specified_editor(const char *editor, const char *path,
				   struct strbuf *buffer, const char *const *env)
{
	int term_fail;

	if (!editor)
		return error("Terminal is dumb, but EDITOR unset");

	if (strcmp(editor, ":")) {
		struct strbuf realpath = STRBUF_INIT;
		const char *args[] = { editor, NULL, NULL };
		struct child_process p = CHILD_PROCESS_INIT;
		int ret, sig;
		int print_waiting_for_editor = advice_enabled(ADVICE_WAITING_FOR_EDITOR) && isatty(2);

		if (print_waiting_for_editor) {
			/*
			 * A dumb terminal cannot erase the line later on. Add a
			 * newline to separate the hint from subsequent output.
			 *
			 * Make sure that our message is separated with a whitespace
			 * from further cruft that may be written by the editor.
			 */
			const char term = is_terminal_dumb() ? '\n' : ' ';

			fprintf(stderr,
				_("hint: Waiting for your editor to close the file...%c"),
				term);
			fflush(stderr);
		}

		strbuf_realpath(&realpath, path, 1);
		args[1] = realpath.buf;

		p.argv = args;
		p.env = env;
		p.use_shell = 1;
		p.trace2_child_class = "editor";
		term_fail = save_term(1);
		if (start_command(&p) < 0) {
			if (!term_fail)
				restore_term();
			strbuf_release(&realpath);
			return error("unable to start editor '%s'", editor);
		}

		sigchain_push(SIGINT, SIG_IGN);
		sigchain_push(SIGQUIT, SIG_IGN);
		ret = finish_command(&p);
		if (!term_fail)
			restore_term();
		strbuf_release(&realpath);
		sig = ret - 128;
		sigchain_pop(SIGINT);
		sigchain_pop(SIGQUIT);
		if (sig == SIGINT || sig == SIGQUIT)
			raise(sig);
		if (ret)
			return error("There was a problem with the editor '%s'.",
					editor);

		if (print_waiting_for_editor && !is_terminal_dumb())
			/*
			 * Erase the entire line to avoid wasting the
			 * vertical space.
			 */
			term_clear_line();
	}

	if (!buffer)
		return 0;
	if (strbuf_read_file(buffer, path, 0) < 0)
		return error_errno("could not read file '%s'", path);
	return 0;
}

int launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
{
	return launch_specified_editor(git_editor(), path, buffer, env);
}

int launch_sequence_editor(const char *path, struct strbuf *buffer,
			   const char *const *env)
{
	return launch_specified_editor(git_sequence_editor(), path, buffer, env);
}