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#!/usr/bin/tclsh
# Usage: tkread [-w]
# -w rewrap lines
#
# The markdown parsing is inspired by the code of smu:
# <https://github.com/Gottox/smu>
#
# TODO:
# - justify text (not simple; see http://wiki.tcl.tk/1774)
# - add a basic search function
# - add function to type 30g to scroll 30% through an article
# - if window width is small, reduce padx space
# - make scrolling using mouse work even when text area isn't hovered over (also note this sort of scrolling doesn't update the title); integrate the MouseWheel event with scroll. this *should* also fix the issue of dragging and then leaving the window, as the strange scrolling is likely caused by related default behaviour
# - add more markdown processing and control it using a flag
# - use font create / configure to name a font to simplify changing its size
set fontsize 15
set textcolour #443322
set bgcolour #eeeeee
set outercolour #f8f8f5
set inverttextcolour #eeeeee
set invertbgcolour #333030
set invertoutercolour #222222
set inverted 0
set drag 0
set tagnum 0
set surroundfmt { \
{"***" "bold italic"} \
{"**" "bold"} \
{"*" "italic"} \
}
package require Tk
proc rewrap {text} {
set wrapped [regsub -all {\n([^\n])} $text { \1}]
set spaced [regsub -all { *} $wrapped { }]
set better [regsub -all {\n *} $spaced "\n"]
set better [regsub -all {\n} $better "\n\n"]
return [regsub -all {\n\n\n} $better "\n"]
}
# 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.
proc markup {widget} {
global surroundfmt
global fontsize
global tagnum
foreach fmt $surroundfmt {
set searchchar [lindex $fmt 0]
set fmtstring [lindex $fmt 1]
set searchlen [string length $searchchar]
set insection 0
set cur ""
set markonnum 0
set markoffnum 0
set cur [$widget search $searchchar 0.0 end]
while {$cur != ""} {
if {$insection == 0} {
set insection 1
$widget mark set markon_$markonnum $cur
incr markonnum
} else {
set insection 0
$widget mark set markoff_$markoffnum $cur
incr markoffnum
}
$widget delete $cur "$cur + $searchlen chars"
set cur [$widget search "$searchchar" $cur end]
}
# ignore any final mismatched mark
if {$markonnum != $markoffnum } {
set markonnum $markoffnum
}
for {set x 0} {$x < $markonnum} {incr x} {
$widget tag add tag_$tagnum markon_$x markoff_$x
}
$widget tag configure tag_$tagnum -font "Times $fontsize $fmtstring"
incr tagnum
}
}
proc changeFontSize {change} {
global fontsize
global surroundfmt
global tagnum
set newsize [expr $fontsize $change]
if {$newsize > 0} {
set fontsize $newsize
.t configure -font "Times $fontsize" -padx [expr $fontsize * 3]
for {set x 0} {$x < $tagnum} {incr x} {
set fmtstring [lindex [lindex $surroundfmt $x] 1]
.t tag configure tag_$x -font "Times $fontsize $fmtstring"
}
}
}
proc invertColours {} {
global inverted
global bgcolour textcolour outercolour
global invertbgcolour inverttextcolour invertoutercolour
if {$inverted} {
set inverted 0
.t configure -bg $bgcolour -fg $textcolour
. configure -bg $outercolour
} else {
set inverted 1
.t configure -bg $invertbgcolour -fg $inverttextcolour
. configure -bg $invertoutercolour
}
}
proc scroll {dir amount} {
.t yview scroll $dir $amount
set percent [expr [lindex [.t yview] 1] * 100]
set rough [regsub {\..*} $percent {}]
wm title . "tkread $rough%"
}
proc doMotion {ypos} {
global lasty
if { $lasty != -1 } {
scroll [expr $lasty - $ypos] pixels
}
set lasty $ypos
}
. configure -bg $outercolour
text .t -font "Times $fontsize" -wrap word -width 64 -padx [expr $fontsize * 3] -bg $bgcolour -fg $textcolour -relief flat -inactiveselectbackground {} -cursor {}
pack .t -expand yes -fill y
set text [read stdin]
if { $::argc > 0 && [lindex $::argv 0] == "-w" } {
set text [rewrap $text]
}
.t insert end $text
markup .t
.t configure -state disabled ;# disable cursor
bind . <Up> {scroll -1 unit}
bind . <k> {scroll -1 unit}
bind . <Down> {scroll 1 unit}
bind . <j> {scroll 1 unit}
bind . <Prior> {scroll -1 page}
bind . <Shift-space> {scroll -1 page}
bind . <Left> {scroll -1 page}
bind . <b> {scroll -1 page}
bind . <K> {scroll -1 page}
bind . <Next> {scroll 1 page}
bind . <space> {scroll 1 page}
bind . <Right> {scroll 1 page}
bind . <J> {scroll 1 page}
bind . <Home> {.t yview moveto 0}
bind . <End> {.t yview moveto 1}
bind . <equal> {changeFontSize +5}
bind . <minus> {changeFontSize -5}
bind . <plus> {changeFontSize +1}
bind . <underscore> {changeFontSize -1}
bind . <v> {invertColours}
bind . <q> {exit}
bind . <ButtonPress-1> {set drag 1; set lasty -1}
bind . <ButtonRelease-1> {set drag 0}
bind . <Motion> {if {$drag} { doMotion %y } }
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