From 770b68f921e3ed28b34db8ca306682e3142114af Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.me.uk>
Date: Sun, 23 Feb 2014 11:20:27 +0000
Subject: Add prefix headings

---
 tkread | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/tkread b/tkread
index 4a712b8..bbd14c8 100755
--- a/tkread
+++ b/tkread
@@ -36,6 +36,7 @@ set inverted 0
 set drag 0
 set tagnum 0
 set underlinenum 0
+set prefixnum 0
 set domarkdown 0
 
 set surroundfmt { \
@@ -49,6 +50,15 @@ set underlinefmt { \
 	{"-" "3" "italic"} \
 }
 
+set prefixfmt { \
+	{"# " "6" ""} \
+	{"## " "3" "italic"} \
+	{"### " "1" "italic"} \
+	{"#### " "0" "italic"} \
+	{"##### " "0" "italic"} \
+	{"###### " "0" "italic"} \
+}
+
 if { $::argc > 0 && [lindex $::argv 0] == "-h" } {
 	puts "Usage: $usage"
 	exit
@@ -77,10 +87,12 @@ proc indexmovechar {str moveby} {
 proc markup {widget} {
 	global surroundfmt
 	global underlinefmt
+	global prefixfmt
 	global fontfamily
 	global fontsize
 	global tagnum
 	global underlinenum
+	global prefixnum
 
 	# process surrounds (bold, italic, and some headers)
 	# This uses marks before tags, as they handle deletions fine, so
@@ -173,6 +185,24 @@ proc markup {widget} {
 		$widget tag configure underline_$underlinenum -font "{$fontfamily} [expr $fontsize + $fmtsizemod] $fmtstring"
 		incr underlinenum
 	}
+
+	foreach fmt $prefixfmt {
+		set searchchar [lindex $fmt 0]
+		set fmtsizemod [lindex $fmt 1]
+		set fmtstring [lindex $fmt 2]
+
+		set cur [$widget search -regexp "^$searchchar" 0.0 end]
+		while {$cur != ""} {
+			set dotindex [string first . $cur]
+			set linenum [string range $cur 0 [expr $dotindex - 1]]
+			$widget tag add prefix_$prefixnum $linenum.0 $linenum.end
+			$widget delete $linenum.0 $linenum.[string length $searchchar]
+
+			set cur [$widget search -regexp "^$searchchar" [expr $linenum + 1].0 end]
+		}
+		$widget tag configure prefix_$prefixnum -font "{$fontfamily} [expr $fontsize + $fmtsizemod] $fmtstring"
+		incr prefixnum
+	}
 }
 
 proc changeFontSize {change} {
@@ -182,6 +212,8 @@ proc changeFontSize {change} {
 	global tagnum
 	global underlinefmt
 	global underlinenum
+	global prefixfmt
+	global prefixnum
 	set newsize [expr $fontsize $change]
 	if {$newsize > 0} {
 		set fontsize $newsize
@@ -196,6 +228,11 @@ proc changeFontSize {change} {
 			set fmtsizemod [lindex [lindex $underlinefmt $x] 1]
 			.t tag configure underline_$x -font "{$fontfamily} [expr $fontsize + $fmtsizemod] $fmtstring"
 		}
+		for {set x 0} {$x < $prefixnum} {incr x} {
+			set fmtstring [lindex [lindex $prefixfmt $x] 2]
+			set fmtsizemod [lindex [lindex $prefixfmt $x] 1]
+			.t tag configure prefix_$x -font "{$fontfamily} [expr $fontsize + $fmtsizemod] $fmtstring"
+		}
 	}
 }
 
-- 
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