From b804417f36ef398f1223e439fd5ac9f2ade046eb Mon Sep 17 00:00:00 2001
From: Robin Haberkorn <robin.haberkorn@googlemail.com>
Date: Mon, 19 Nov 2012 21:43:39 +0100
Subject: support special "{" alternate escape character: is only terminated by
 a matching *balanced* "}"

this eases writing nested macros
---
 parser.cpp | 30 +++++++++++++++++++++++-------
 parser.h   |  4 +++-
 teco.ini   |  4 ++--
 3 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/parser.cpp b/parser.cpp
index b75e3bf..89486a1 100644
--- a/parser.cpp
+++ b/parser.cpp
@@ -259,24 +259,38 @@ StateExpectString::custom(gchar chr) throw (Error)
 	 * String termination handling
 	 */
 	if (Modifiers::at) {
-		undo.push_var<bool>(Modifiers::at);
+		undo.push_var(Modifiers::at);
 		Modifiers::at = false;
-		undo.push_var<gchar>(escape_char);
+		undo.push_var(escape_char);
 		escape_char = g_ascii_toupper(chr);
 
 		return this;
 	}
 
-	if (g_ascii_toupper(chr) == escape_char) {
+	if (escape_char == '{') {
+		switch (chr) {
+		case '{':
+			undo.push_var(nesting);
+			nesting++;
+			break;
+		case '}':
+			undo.push_var(nesting);
+			nesting--;
+			break;
+		}
+	} else if (g_ascii_toupper(chr) == escape_char) {
+		undo.push_var(nesting);
+		nesting--;
+	}
+
+	if (!nesting) {
+		State *next;
 		gchar *string = strings[0];
 		undo.push_str(strings[0]);
 		strings[0] = NULL;
-
-		State *next = done(string ? : "");
-		g_free(string);
-
 		undo.push_var(escape_char);
 		escape_char = '\x1B';
+		nesting = 1;
 
 		if (string_building) {
 			undo.push_var(machine);
@@ -285,6 +299,8 @@ StateExpectString::custom(gchar chr) throw (Error)
 			machine.toctl = false;
 		}
 
+		next = done(string ? : "");
+		g_free(string);
 		return next;
 	}
 
diff --git a/parser.h b/parser.h
index ba3a632..a704c83 100644
--- a/parser.h
+++ b/parser.h
@@ -110,11 +110,13 @@ class StateExpectString : public State {
 			    mode(MODE_NORMAL), toctl(false) {}
 	} machine;
 
+	gint nesting;
+
 	bool string_building;
 
 public:
 	StateExpectString(bool _building = true)
-			 : State(), string_building(_building) {}
+			 : State(), nesting(1), string_building(_building) {}
 
 private:
 	gchar *machine_input(gchar key) throw (Error);
diff --git a/teco.ini b/teco.ini
index e7c1a42..97ae766 100755
--- a/teco.ini
+++ b/teco.ini
@@ -2,7 +2,7 @@
 
 ! TECO.INI !
 
-@0/
+@0{
   Oadd,edit,close,quit
 
 !add! [f[r[0[1[2
@@ -42,7 +42,7 @@
 !quit!
   ! fall through !
 
-!end!/
+!end!}
 ED#32ED
 
 ! open all files specified on the commandline !
-- 
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