From ef3c9334483f1796ac3053794120f359f7676a1d Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.me.uk>
Date: Sat, 22 Feb 2014 14:11:36 +0000
Subject: Add local image loading

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

diff --git a/tkread b/tkread
index 8c989bb..af9a9e9 100755
--- a/tkread
+++ b/tkread
@@ -1,4 +1,6 @@
 #!/usr/bin/tclsh
+# Requires Tk and Img packages (tk and libtk-img in Debian)
+#
 # Copyright 2013-2014 Nick White <njw.me.uk>, released under the ISC License
 #
 # Permission to use, copy, modify, and/or distribute this software for any
@@ -50,6 +52,7 @@ if { $::argc > 0 && [lindex $::argv 0] == "-h" } {
 }
 
 package require Tk
+package require Img
 
 proc rewrap {text} {
 	set wrapped [regsub -all {\n([^\n])} $text { \1}]
@@ -59,6 +62,14 @@ proc rewrap {text} {
 	return [regsub -all {\n\n\n} $better "\n"]
 }
 
+# Moves char part of a text widget index (linenum.charnum)
+proc indexmovechar {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 $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.
@@ -68,6 +79,7 @@ proc markup {widget} {
 	global fontsize
 	global tagnum
 
+	# process surrounds (bold, italic, and some headers)
 	foreach fmt $surroundfmt {
 		set searchchar [lindex $fmt 0]
 		set fmtsizemod [lindex $fmt 1]
@@ -107,6 +119,34 @@ proc markup {widget} {
 		$widget tag configure tag_$tagnum -font "{$fontfamily} [expr $fontsize + $fmtsizemod] $fmtstring"
 		incr tagnum
 	}
+
+	# process images
+	set cur [$widget search {![} 0.0 end]
+	while {$cur != ""} {
+		set altstart [indexmovechar $cur "+ 2"]
+		set cur [$widget search "](" $cur end]
+		if {$cur == ""} { break }
+		set altend $cur
+		set srcstart [indexmovechar $cur "+ 2"]
+		set cur [$widget search ")" $cur end]
+		if {$cur == ""} { break }
+		set srcend $cur
+
+		set alt [$widget get $altstart $altend]
+		set src [$widget get $srcstart $srcend]
+
+		$widget delete [indexmovechar $altstart "- 2"] [indexmovechar $srcend "+ 1"]
+		set insertion [indexmovechar $altstart "- 2"]
+		set localfile [file tail $src]
+		if [file exists $localfile] {
+			set curimg [image create photo -file $localfile]
+			$widget image create $insertion -image $curimg
+		} else {
+			$widget insert [indexmovechar $insertion "- 2"] $alt
+		}
+
+		set cur [$widget search {![} $cur end]
+	}
 }
 
 proc changeFontSize {change} {
-- 
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