Show external command line if appropriate

Since I'm already dealing with the fish shell.

All of our supported shells seem to handle cursor position
in Unicode (wide character) codepoints.

It was easiest and most straight-forward to pass the data
through yet-unused program arguments.

The cursor position is marked by a Unicode glyph equivalent
to ACS_DIAMOND, although ncurses doesn't get a chance
to make any ACS translation.

1 files changed, 21 insertions, 6 deletions

diff --git a/sdn.cpp b/sdn.cpp
index f3af9bf..38475d4 100644
--- a/sdn.cpp
+++ b/sdn.cpp
@@ -495,6 +495,7 @@ struct level {
 };
 
 static struct {
+	wstring cmdline;                    ///< Outer command line
 	string cwd;                         ///< Current working directory
 	string start_dir;                   ///< Starting directory
 	vector<entry> entries;              ///< Current directory entries
@@ -525,9 +526,10 @@ static struct {
 	void (*editor_on_change) ();        ///< Callback on editor change
 	void (*editor_on_confirm) ();       ///< Callback on editor confirmation
 
-	enum { AT_CURSOR, AT_BAR, AT_CWD, AT_INPUT, AT_COUNT };
-	chtype attrs[AT_COUNT] = {A_REVERSE, 0, A_BOLD, 0};
-	const char *attr_names[AT_COUNT] = {"cursor", "bar", "cwd", "input"};
+	enum { AT_CURSOR, AT_BAR, AT_CWD, AT_INPUT, AT_CMDLINE, AT_COUNT };
+	chtype attrs[AT_COUNT] = {A_REVERSE, 0, A_BOLD, 0, 0};
+	const char *attr_names[AT_COUNT] =
+		{"cursor", "bar", "cwd", "input", "cmdline"};
 
 	map<int, chtype> ls_colors;         ///< LS_COLORS decoded
 	map<string, chtype> ls_exts;        ///< LS_COLORS file extensions
@@ -746,6 +748,9 @@ fun update () {
 	} else if (!g.message.empty ()) {
 		move (LINES - 1, 0);
 		print (apply_attrs (g.message, 0), COLS);
+	} else if (!g.cmdline.empty ()) {
+		move (LINES - 1, 0);
+		print (apply_attrs (g.cmdline, g.attrs[g.AT_CMDLINE]), COLS);
 	}
 
 	refresh ();
@@ -1352,6 +1357,18 @@ fun inotify_check () {
 		update ();
 }
 
+fun load_cmdline (int argc, char *argv[]) {
+	if (argc < 3)
+		return;
+
+	wstring line = to_wide (argv[1]); int point = atoi (argv[2]);
+	if (line.empty () || point < 0 || point > (int) line.length ())
+		return;
+
+	std::replace_if (line.begin (), line.end (), iswspace, L' ');
+	g.cmdline = line.substr (0, point) + L"◆" + line.substr (point);
+}
+
 fun decode_ansi_sgr (const vector<string> &v) -> chtype {
 	vector<int> args;
 	for (const auto &arg : v) {
@@ -1627,9 +1644,6 @@ fun save_config () {
 }
 
 int main (int argc, char *argv[]) {
-	(void) argc;
-	(void) argv;
-
 	// That bitch zle closes stdin before exec without redirection
 	(void) close (STDIN_FILENO);
 	if (open ("/dev/tty", O_RDWR)) {
@@ -1658,6 +1672,7 @@ int main (int argc, char *argv[]) {
 		return 1;
 	}
 
+	load_cmdline (argc, argv);
 	load_colors ();
 	g.start_dir = g.cwd = initial_cwd ();
 	reload (false);