root/editor.c

DEFINITIONS

1. git_editor
2. launch_editor

#include "cache.h"
#include "strbuf.h"
#include "run-command.h"
#include "sigchain.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, real_path(path), NULL };
                struct child_process p = CHILD_PROCESS_INIT;
                int ret, sig;

                p.argv = args;
                p.env = env;
                p.use_shell = 1;
                if (start_command(&p) < 0)
                        return error("unable to start editor '%s'", editor);

                sigchain_push(SIGINT, SIG_IGN);
                sigchain_push(SIGQUIT, SIG_IGN);
                ret = finish_command(&p);
                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 (!buffer)
                return 0;
        if (strbuf_read_file(buffer, path, 0) < 0)
                return error("could not read file '%s': %s",
                                path, strerror(errno));
        return 0;
}