From 6c5bdddbb5e7f79a04a0ee2bd7a9252035151812 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20Andr=C3=A9=20Tanner?= <mat@brain-dump.org>
Date: Thu, 11 Sep 2014 15:52:32 +0200
Subject: Add :edit command

---
 config.def.h |  1 +
 editor.c     | 23 +++++++++++++++++++++++
 editor.h     |  2 ++
 vis.c        | 38 +++++++++++++++++++++++++++++++-------
 window.c     |  6 ++++++
 window.h     |  2 ++
 6 files changed, 65 insertions(+), 7 deletions(-)

diff --git a/config.def.h b/config.def.h
index d26045d..4b5bf79 100644
--- a/config.def.h
+++ b/config.def.h
@@ -50,6 +50,7 @@ enum {
  */
 static Command cmds[] = {
 	{ "^[0-9]+",        cmd_gotoline   },
+	{ "^e(dit)?",       cmd_edit       },
 	{ "^o(pen)?",       cmd_open       },
 	{ "^qa(ll)?",       cmd_qall       },
 	{ "^q(quit)?",      cmd_quit       },
diff --git a/editor.c b/editor.c
index a7ef802..455f3ae 100644
--- a/editor.c
+++ b/editor.c
@@ -85,6 +85,29 @@ static void editor_windows_arrange_vertical(Editor *ed) {
 	}
 }
 
+bool editor_window_reload(EditorWin *win) {
+	const char *filename = text_filename(win->text);
+	/* can't reload unsaved file */
+	if (!filename)
+		return false;
+	Text *text = text_load(filename);
+	if (!text)
+		return false;
+	/* check wether the text is displayed in another window */
+	bool needed = false;
+	for (EditorWin *w = win->editor->windows; w; w = w->next) {
+		if (w != win && w->text == win->text) {
+			needed = true;
+			break;
+		}
+	}
+	if (!needed)
+		text_free(win->text);
+	win->text = text;
+	window_reload(win->win, text);
+	return true;
+}
+
 static void editor_window_split_internal(Editor *ed, const char *filename) {
 	EditorWin *sel = ed->win;
 	if (filename) {
diff --git a/editor.h b/editor.h
index 8ca1a79..f7030b0 100644
--- a/editor.h
+++ b/editor.h
@@ -128,6 +128,8 @@ void editor_syntax_unload(Editor*);
 /* creates a new window, and loads the given file. if filename is NULL
  * an unamed / empty buffer is created */
 bool editor_window_new(Editor*, const char *filename);
+/* reload the file currently displayed in the window from disk */
+bool editor_window_reload(EditorWin*);
 void editor_window_close(EditorWin*);
 /* if filename is non NULL it is equivalent to window_new call above.
  * if however filename is NULL a new window is created and linked to the
diff --git a/vis.c b/vis.c
index 29ffe9e..8ca33bd 100644
--- a/vis.c
+++ b/vis.c
@@ -383,6 +383,9 @@ static void quit(const Arg *arg);
 static bool cmd_gotoline(const char *argv[]);
 /* for each argument create a new window and open the corresponding file */
 static bool cmd_open(const char *argv[]);
+/* close current window (discard modifications if argv[0] contains '!')
+ * and open argv[1], if no argv[1] is given re-read to current file from disk */
+static bool cmd_edit(const char *argv[]);
 /* close the current window, if argv[0] contains a '!' discard modifications */
 static bool cmd_quit(const char *argv[]);
 /* close all windows, exit editor, if argv[0] contains a '!' discard modifications */
@@ -864,18 +867,39 @@ static bool cmd_gotoline(const char *argv[]) {
 }
 
 static bool cmd_open(const char *argv[]) {
-	for (const char **file = &argv[1]; *file; file++)
-		editor_window_new(vis, *file);
+	for (const char **file = &argv[1]; *file; file++) {
+		if (!editor_window_new(vis, *file))
+			return false;
+	}
+	return true;
+}
+
+static bool is_window_closeable(EditorWin *win) {
+	if (!text_modified(win->text))
+		return true;
+	for (EditorWin *w = vis->windows; w; w = w->next) {
+		if (w != win && w->text == win->text)
+			return true;
+	}
+	return false;
+}
+
+static bool cmd_edit(const char *argv[]) {
+	EditorWin *oldwin = vis->win;
+	bool force = strchr(argv[0], '!') != NULL;
+	if (!force && !is_window_closeable(oldwin))
+		return false;
+	if (!argv[1])
+		return editor_window_reload(oldwin);
+	if (!editor_window_new(vis, argv[1]))
+		return false;
+	editor_window_close(oldwin);
 	return true;
 }
 
 static bool cmd_quit(const char *argv[]) {
 	bool force = strchr(argv[0], '!') != NULL;
-	for (EditorWin *win = vis->windows; !force && win; win = win->next) {
-		if (win != vis->win && win->text == vis->win->text)
-			force = true;
-	}
-	if (!force && text_modified(vis->win->text))
+	if (!force && !is_window_closeable(vis->win))
 		return false;
 	editor_window_close(vis->win);
 	if (!vis->windows)
diff --git a/window.c b/window.c
index 931c4dc..4a80331 100644
--- a/window.c
+++ b/window.c
@@ -463,6 +463,12 @@ void window_free(Win *win) {
 	free(win);
 }
 
+void window_reload(Win *win, Text *text) {
+	win->text = text;
+	window_selection_clear(win);
+	window_cursor_to(win, 0);
+}
+
 Win *window_new(Text *text) {
 	if (!text)
 		return NULL;
diff --git a/window.h b/window.h
index f7016b5..e7d5b0b 100644
--- a/window.h
+++ b/window.h
@@ -9,6 +9,8 @@
 typedef struct Win Win;
 
 Win *window_new(Text*);
+/* change associated text displayed in this window */
+void window_reload(Win*, Text*);
 void window_free(Win*);
 
 /* keyboard input at cursor position */
-- 
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