1 files changed, 56 insertions, 0 deletions
diff --git a/editor.c b/editor.c
new file mode 100644
index 0000000000..483b62d2ce
--- /dev/null
+++ b/editor.c
@@ -0,0 +1,56 @@
+#include "cache.h"
+#include "strbuf.h"
+#include "run-command.h"
+
+void launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
+{
+	const char *editor, *terminal;
+
+	editor = getenv("GIT_EDITOR");
+	if (!editor && editor_program)
+		editor = editor_program;
+	if (!editor)
+		editor = getenv("VISUAL");
+	if (!editor)
+		editor = getenv("EDITOR");
+
+	terminal = getenv("TERM");
+	if (!editor && (!terminal || !strcmp(terminal, "dumb"))) {
+		fprintf(stderr,
+		"Terminal is dumb but no VISUAL nor EDITOR defined.\n"
+		"Please supply the message using either -m or -F option.\n");
+		exit(1);
+	}
+
+	if (!editor)
+		editor = "vi";
+
+	if (strcmp(editor, ":")) {
+		size_t len = strlen(editor);
+		int i = 0;
+		const char *args[6];
+		struct strbuf arg0;
+
+		strbuf_init(&arg0, 0);
+		if (strcspn(editor, "$ \t'") != len) {
+			/* there are specials */
+			strbuf_addf(&arg0, "%s \"$@\"", editor);
+			args[i++] = "sh";
+			args[i++] = "-c";
+			args[i++] = arg0.buf;
+		}
+		args[i++] = editor;
+		args[i++] = path;
+		args[i] = NULL;
+
+		if (run_command_v_opt_cd_env(args, 0, NULL, env))
+			die("There was a problem with the editor %s.", editor);
+		strbuf_release(&arg0);
+	}
+
+	if (!buffer)
+		return;
+	if (strbuf_read_file(buffer, path, 0) < 0)
+		die("could not read message file '%s': %s",
+		    path, strerror(errno));
+}