From 0d01c262c0ed23ef950530c743b023e89ef4a821 Mon Sep 17 00:00:00 2001
From: Robin Haberkorn <robin.haberkorn@googlemail.com>
Date: Thu, 8 Nov 2012 02:21:36 +0100
Subject: support line termination ($$) as immediate editing command + some
 fixes

 * separate function for immediate editing command processing
 * undo.clear() to remove and free all undo tokens without executing them
 * goto_table_clear() to remove and free all goto table entries
---
 cmdline.cpp | 62 +++++++++++++++++++++++++++++++++++++++++++------------------
 goto.cpp    |  6 ++++++
 goto.h      |  2 ++
 parser.cpp  |  2 +-
 undo.cpp    | 11 +++++++++++
 undo.h      |  2 ++
 6 files changed, 66 insertions(+), 19 deletions(-)

diff --git a/cmdline.cpp b/cmdline.cpp
index e0159ec..b9c58a0 100644
--- a/cmdline.cpp
+++ b/cmdline.cpp
@@ -5,8 +5,10 @@
 
 #include "sciteco.h"
 #include "parser.h"
+#include "goto.h"
 #include "undo.h"
 
+static inline const gchar *process_edit_cmd(gchar key);
 static gchar *macro_echo(const gchar *macro, const gchar *prefix = "");
 
 gchar *cmdline = NULL;
@@ -14,27 +16,14 @@ gchar *cmdline = NULL;
 void
 cmdline_keypress(gchar key)
 {
-	gchar insert[255] = "";
+	const gchar *insert;
 	gint old_cmdline_len = 0;
 	gchar *echo;
 
 	/*
 	 * Process immediate editing commands
 	 */
-	switch (key) {
-	case '\b':
-		if (!cmdline || !*cmdline)
-			break;
-		old_cmdline_len = strlen(cmdline);
-
-		undo.pop(old_cmdline_len);
-		cmdline[old_cmdline_len-1] = '\0';
-		macro_pc--;
-		break;
-	default:
-		insert[0] = key;
-		insert[1] = '\0';
-	}
+	insert = process_edit_cmd(key);
 
 	/*
 	 * Parse/execute characters
@@ -44,12 +33,12 @@ cmdline_keypress(gchar key)
 		cmdline = (gchar *)g_realloc(cmdline, old_cmdline_len +
 						      strlen(insert) + 1);
 	} else {
-		cmdline = (gchar *)g_malloc(2);
+		cmdline = (gchar *)g_malloc(strlen(insert) + 1);
 		*cmdline = '\0';
 	}
 
-	for (gchar *p = insert; *p; p++) {
-		strcat(cmdline, (gchar[]){key, '\0'});
+	for (const gchar *p = insert; *p; p++) {
+		strcat(cmdline, (gchar[]){*p, '\0'});
 
 		if (!macro_execute(cmdline)) {
 			cmdline[old_cmdline_len] = '\0';
@@ -65,6 +54,43 @@ cmdline_keypress(gchar key)
 	g_free(echo);
 }
 
+static inline const gchar *
+process_edit_cmd(gchar key)
+{
+	static gchar insert[255];
+	gint cmdline_len = cmdline ? strlen(cmdline) : 0;
+
+	insert[0] = '\0';
+
+	switch (key) {
+	case '\b':
+		if (cmdline_len) {
+			undo.pop(cmdline_len);
+			cmdline[cmdline_len - 1] = '\0';
+			macro_pc--;
+		}
+		break;
+
+	case '\x1B':
+		if (cmdline && cmdline[cmdline_len - 1] == '\x1B') {
+			/* TODO: exit if previously requested */
+
+			undo.clear();
+			goto_table_clear();
+
+			*cmdline = '\0';
+			macro_pc = 0;
+			break;
+		}
+		/* fall through */
+	default:
+		insert[0] = key;
+		insert[1] = '\0';
+	}
+
+	return insert;
+}
+
 static gchar *
 macro_echo(const gchar *macro, const gchar *prefix)
 {
diff --git a/goto.cpp b/goto.cpp
index 3785076..f4d9497 100644
--- a/goto.cpp
+++ b/goto.cpp
@@ -160,6 +160,12 @@ public:
 
 static GotoTable table;
 
+void
+goto_table_clear(void)
+{
+	table.clear();
+}
+
 StateLabel::StateLabel() : State()
 {
 	transitions['\0'] = this;
diff --git a/goto.h b/goto.h
index 64ae31b..0a83406 100644
--- a/goto.h
+++ b/goto.h
@@ -14,4 +14,6 @@ private:
 	State *custom(gchar chr);
 };
 
+void goto_table_clear(void);
+
 #endif
diff --git a/parser.cpp b/parser.cpp
index 60c2c49..5eefaf5 100644
--- a/parser.cpp
+++ b/parser.cpp
@@ -460,7 +460,7 @@ StateControl::custom(gchar chr)
 #endif
 
 	/*
-	 * Alternatives: ^[, <CTRL/[> (cannot be typed), <ESC>
+	 * Alternatives: ^[, <CTRL/[>, <ESC>
 	 */
 	case '[':
 		BEGIN_EXEC(&states.start);
diff --git a/undo.cpp b/undo.cpp
index 106f812..7a58c92 100644
--- a/undo.cpp
+++ b/undo.cpp
@@ -47,6 +47,17 @@ UndoStack::pop(gint pos)
 	}
 }
 
+void
+UndoStack::clear(void)
+{
+	UndoToken *cur;
+
+	while ((cur = SLIST_FIRST(&head))) {
+		SLIST_REMOVE_HEAD(&head, tokens);
+		delete cur;
+	}
+}
+
 UndoStack::~UndoStack()
 {
 	UndoToken *token, *next;
diff --git a/undo.h b/undo.h
index aeefb09..5b955ab 100644
--- a/undo.h
+++ b/undo.h
@@ -124,6 +124,8 @@ public:
 	}
 
 	void pop(gint pos);
+
+	void clear(void);
 } undo;
 
 #endif
\ No newline at end of file
-- 
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