From 580d588d7225ee3c229fc41f17711ec915875729 Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.name>
Date: Sat, 5 Apr 2014 12:28:19 -0400
Subject: Handle image 'title' tags, as used by pandoc

---
 tkread | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/tkread b/tkread
index 34472b1..f4c6039 100755
--- a/tkread
+++ b/tkread
@@ -90,6 +90,14 @@ proc indexmovechar {str moveby} {
 	return $linenum.[expr $charnum $moveby]
 }
 
+# Moves line part of a text widget index (linenum.charnum)
+proc indexmoveline {str moveby} {
+	set dotindex [string first . $str]
+	set charnum [string range $str [expr $dotindex + 1] end]
+	set linenum [string range $str 0 [expr $dotindex - 1]]
+	return [expr $linenum $moveby].$charnum
+}
+
 # TODO: move each section into their own procedures
 proc markup {widget} {
 	global fontfamily
@@ -117,6 +125,15 @@ proc markup {widget} {
 		set alt [$widget get $altstart $altend]
 		set src [$widget get $srcstart $srcend]
 
+		# sometimes "title" tags are encoded after a space following the source, enclosed in ""
+		set imgtitlestart [string first " " $src]
+		if {$imgtitlestart != -1} {
+			set imgtitle [string trim [string range $src $imgtitlestart end] {" }]
+			set src [string range $src 0 [expr $imgtitlestart - 1] ]
+		} else {
+			set imgtitle ""
+		}
+
 		$widget delete [indexmovechar $altstart "- 2"] [indexmovechar $srcend "+ 1"]
 		set insertion [indexmovechar $altstart "- 2"]
 		set localfile [file tail $src]
@@ -129,6 +146,11 @@ proc markup {widget} {
 			set cur [indexmovechar $insertion "+ [string length $alt]"]
 		}
 
+		set insertion [indexmoveline $insertion "+ 1"]
+		if {[string length $imgtitle] != 0} {
+			$widget insert $insertion "${imgtitle}\n"
+		}
+
 		set cur [$widget search {![} $cur end]
 	}
 
-- 
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