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tag: v1.7.8.2
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#include "cache.h"
#include "strbuf.h"
#include "run-command.h"

#ifndef DEFAULT_EDITOR
#define DEFAULT_EDITOR "vi"
#endif

const char *git_editor(void)
{
const char *editor = getenv("GIT_EDITOR");
const char *terminal = getenv("TERM");
int terminal_is_dumb = !terminal || !strcmp(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;
}

int launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
{
const char *editor = git_editor();

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

if (strcmp(editor, ":")) {
const char *args[] = { editor, path, NULL };

if (run_command_v_opt_cd_env(args, RUN_USING_SHELL, NULL, env))
return error("There was a problem with the editor '%s'.",
editor);
}

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