From f39abeb1a9b048713d8de2670523c4d1fe687888 Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.me.uk>
Date: Sat, 22 Feb 2014 17:10:32 +0000
Subject: Add underline heading processing

---
 tkread | 47 ++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 40 insertions(+), 7 deletions(-)

diff --git a/tkread b/tkread
index af9a9e9..95f5d42 100755
--- a/tkread
+++ b/tkread
@@ -35,17 +35,20 @@ set invertoutercolour #222222
 set inverted 0
 set drag 0
 set tagnum 0
+set underlinenum 0
 set domarkdown 0
 
 set surroundfmt { \
       {"***" "0" "bold italic"} \
       {"**" "0" "bold"} \
       {"*" "0" "italic"} \
-      {"===" "0" "italic"} \
-      {"==" "3" "italic"} \
-      {"=" "6" ""} \
      }
 
+set underlinefmt { \
+	{"=" "6" ""} \
+	{"-" "3" "italic"} \
+}
+
 if { $::argc > 0 && [lindex $::argv 0] == "-h" } {
 	puts "Usage: $usage"
 	exit
@@ -70,16 +73,20 @@ proc indexmovechar {str moveby} {
 	return $linenum.[expr $charnum $moveby]
 }
 
-# This uses marks before tags, as they handle deletions fine, so
-# marks can be made and then the formatting characters can be
-# deleted without affecting the position for formatting.
+# TODO: move each section into their own procedures
 proc markup {widget} {
 	global surroundfmt
+	global underlinefmt
 	global fontfamily
 	global fontsize
 	global tagnum
+	global underlinenum
 
 	# process surrounds (bold, italic, and some headers)
+	# This uses marks before tags, as they handle deletions fine, so
+	# marks can be made and then the formatting characters can be
+	# deleted without affecting the position for formatting
+	# (should try just tags as they may still work).
 	foreach fmt $surroundfmt {
 		set searchchar [lindex $fmt 0]
 		set fmtsizemod [lindex $fmt 1]
@@ -115,7 +122,6 @@ proc markup {widget} {
 			$widget tag add tag_$tagnum markon_$x markoff_$x
 		}
 
-		# TODO: change in changeFontSize too if this works
 		$widget tag configure tag_$tagnum -font "{$fontfamily} [expr $fontsize + $fmtsizemod] $fmtstring"
 		incr tagnum
 	}
@@ -147,6 +153,26 @@ proc markup {widget} {
 
 		set cur [$widget search {![} $cur end]
 	}
+
+	# NOTE: rewrap currently messes with this
+	# process underlined headings
+	foreach fmt $underlinefmt {
+		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]]
+			$widget tag add underline_$underlinenum [expr $linenum - 1].0 $linenum.end
+			$widget delete $linenum.0 [expr $linenum + 1].0
+
+			set cur [$widget search -regexp "^$searchchar" [expr $linenum + 1].0 end]
+		}
+		$widget tag configure underline_$underlinenum -font "{$fontfamily} [expr $fontsize + $fmtsizemod] $fmtstring"
+		incr underlinenum
+	}
 }
 
 proc changeFontSize {change} {
@@ -154,6 +180,8 @@ proc changeFontSize {change} {
 	global fontsize
 	global surroundfmt
 	global tagnum
+	global underlinefmt
+	global underlinenum
 	set newsize [expr $fontsize $change]
 	if {$newsize > 0} {
 		set fontsize $newsize
@@ -163,6 +191,11 @@ proc changeFontSize {change} {
 			set fmtsizemod [lindex [lindex $surroundfmt $x] 1]
 			.t tag configure tag_$x -font "{$fontfamily} [expr $fontsize + $fmtsizemod] $fmtstring"
 		}
+		for {set x 0} {$x < $underlinenum} {incr x} {
+			set fmtstring [lindex [lindex $underlinefmt $x] 2]
+			set fmtsizemod [lindex [lindex $underlinefmt $x] 1]
+			.t tag configure underline_$x -font "{$fontfamily} [expr $fontsize + $fmtsizemod] $fmtstring"
+		}
 	}
 }
 
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