vis: add a file open dialog

For this to work make sure you have vis-open and slmenu or dmenu
somewhere in $PATH.

For now the file dialog is shown for :open, :split and :vsplit
when the argument is either . (a dot) or looks like a file pattern.

For example

 :open *.[ch]

will show a listing of all C source and header files in the current
directory. Use a fuzzy search to make your choice.

3 files changed, 107 insertions, 19 deletions

diff --git a/Makefile b/Makefile
index 31dd931..e2fcf38 100644
--- a/Makefile
+++ b/Makefile
@@ -34,6 +34,8 @@ install: vis
 	@mkdir -p ${DESTDIR}${PREFIX}/bin
 	@cp -f vis ${DESTDIR}${PREFIX}/bin
 	@chmod 755 ${DESTDIR}${PREFIX}/bin/vis
+	@cp -f vis-open ${DESTDIR}${PREFIX}/bin
+	@chmod 755 ${DESTDIR}${PREFIX}/bin/vis-open
 	@echo installing manual page to ${DESTDIR}${MANPREFIX}/man1
 	@mkdir -p ${DESTDIR}${MANPREFIX}/man1
 	@sed "s/VERSION/${VERSION}/g" < vis.1 > ${DESTDIR}${MANPREFIX}/man1/vis.1
diff --git a/vis-open b/vis-open
new file mode 100755
index 0000000..0bcdd5c
--- /dev/null
+++ b/vis-open
@@ -0,0 +1,47 @@
+#!/bin/sh
+
+PATTERN="."
+[ -z "$VIS_MENU" ] && VIS_MENU="slmenu"
+[ -z "$VIS_MENU_ARGS" ] && VIS_MENU_ARGS="-b"
+
+while [ $# -gt 0 ]; do
+	case "$1" in
+		-h|--help)
+		echo "usage: $0 [-h] [-p prompt] [file-pattern]"
+		exit 0;
+		;;
+		-p)
+		VIS_MENU_ARGS="$VIS_MENU_ARGS -p $2"
+		shift
+		shift
+		;;
+		*)
+		PATTERN=$*
+		break
+		;;
+	esac
+done
+
+if ! type "$VIS_MENU" >/dev/null 2>&1; then
+	if [ ! -z "$DISPLAY" ] && type "dmenu" >/dev/null 2>&1; then
+		VIS_MENU="dmenu"
+	else
+		echo "Neither slmenu nor dmenu found"
+		exit 1
+	fi
+fi
+
+DIR=""
+
+while true; do
+	SEL=$({ echo ..; ls -1 $PATTERN; } | $VIS_MENU $VIS_MENU_ARGS)
+	[ -z "$SEL" ] && exit 1
+	[ ! -z "$DIR" ] && SEL="$DIR/$SEL"
+	if [ -d "$SEL" ]; then
+		DIR="$SEL"
+		PATTERN="$DIR"
+	else
+		echo "$SEL"
+		exit 0
+	fi
+done
diff --git a/vis.c b/vis.c
index 753ddf6..275d48e 100644
--- a/vis.c
+++ b/vis.c
@@ -1502,13 +1502,58 @@ static bool cmd_set(Filerange *range, enum CmdOpt cmdopt, const char *argv[]) {
 	return true;
 }
 
-static bool cmd_open(Filerange *range, enum CmdOpt opt, const char *argv[]) {
-	if (!argv[1])
-		return vis_window_new(NULL);
-	for (const char **file = &argv[1]; *file; file++) {
-		if (!vis_window_new(*file)) {
-			errno = 0;
-			editor_info_show(vis, "Can't open `%s' %s", *file,
+static bool is_file_pattern(const char *pattern) {
+	return strcmp(pattern, ".") == 0 || strchr(pattern, '*') ||
+	       strchr(pattern, '[') || strchr(pattern, '{');
+}
+
+static const char *file_open_dialog(const char *pattern) {
+	if (!is_file_pattern(pattern))
+		return pattern;
+	/* this is a bit of a hack, we temporarily replace the text/view of the active
+	 * window such that we can use cmd_filter as is */
+	char vis_open[512];
+	static char filename[PATH_MAX];
+	Filerange range = text_range_empty();
+	Win *win = vis->win;
+	File *file = win->file;
+	Text *txt_orig = file->text;
+	View *view_orig = win->view;
+	Text *txt = text_load(NULL);
+	View *view = view_new(txt, NULL);
+	filename[0] = '\0';
+	snprintf(vis_open, sizeof(filename)-1, "vis-open %s", pattern ? pattern : "");
+
+	if (!txt || !view)
+		goto out;
+	win->view = view;
+	file->text = txt;
+
+	if (cmd_filter(&range, CMD_OPT_NONE, (const char *[]){ "open", vis_open, NULL })) {
+		size_t len = text_size(txt);
+		if (len >= sizeof(filename))
+			len = 0;
+		if (len > 0)
+			text_bytes_get(txt, 0, len-1, filename);
+		filename[len] = '\0';
+	}
+
+out:
+	view_free(view);
+	text_free(txt);
+	win->view = view_orig;
+	file->text = txt_orig;
+	return filename[0] ? filename : NULL;
+}
+
+static bool openfiles(const char **files) {
+	for (; *files; files++) {
+		const char *file = file_open_dialog(*files);
+		if (!file)
+			continue;
+		errno = 0;
+		if (!vis_window_new(file)) {
+			editor_info_show(vis, "Could not open `%s' %s", file,
 			                 errno ? strerror(errno) : "");
 			return false;
 		}
@@ -1516,6 +1561,12 @@ static bool cmd_open(Filerange *range, enum CmdOpt opt, const char *argv[]) {
 	return true;
 }
 
+static bool cmd_open(Filerange *range, enum CmdOpt opt, const char *argv[]) {
+	if (!argv[1])
+		return vis_window_new(NULL);
+	return openfiles(&argv[1]);
+}
+
 static bool is_view_closeable(Win *win) {
 	if (!text_modified(win->file->text))
 		return true;
@@ -1620,18 +1671,6 @@ static bool cmd_substitute(Filerange *range, enum CmdOpt opt, const char *argv[]
 	return cmd_filter(range, opt, (const char*[]){ argv[0], "sed", pattern, NULL});
 }
 
-static bool openfiles(const char **files) {
-	for (; *files; files++) {
-		errno = 0;
-		if (!vis_window_new(*files)) {
-			editor_info_show(vis, "Could not open `%s' %s", *files,
-			                 errno ? strerror(errno) : "");
-			return false;
-		}
-	}
-	return true;
-}
-
 static bool cmd_split(Filerange *range, enum CmdOpt opt, const char *argv[]) {
 	editor_windows_arrange(vis, UI_LAYOUT_HORIZONTAL);
 	if (!argv[1])