Adds script to generate skeleton for new fonts

basic_latin.csv

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+20,Space
+21,Exclamation mark
+22,Quotation mark
+23,Number sign
+24,Dollar sign
+25,Percent sign
+26,Ampersand
+27,Apostrophe
+28,Left parenthesis
+29,Right parenthesis
+2A,Asterisk
+2B,Plus sign
+2C,Comma
+2D,Hyphen
+2E,Full stop
+2F,Slash
+30,Digit Zero
+31,Digit One
+32,Digit Two
+33,Digit Three
+34,Digit Four
+35,Digit Five
+36,Digit Six
+37,Digit Seven
+38,Digit Eight
+39,Digit Nine
+3A,Colon
+3B,Semicolon
+3C,Less-than sign
+3D,Equal sign
+3E,Greater-than sign
+3F,Question mark
+40,At sign
+41,Latin Capital letter A
+42,Latin Capital letter B
+43,Latin Capital letter C
+44,Latin Capital letter D
+45,Latin Capital letter E
+46,Latin Capital letter F
+47,Latin Capital letter G
+48,Latin Capital letter H
+49,Latin Capital letter I
+4A,Latin Capital letter J
+4B,Latin Capital letter K
+4C,Latin Capital letter L
+4D,Latin Capital letter M
+4E,Latin Capital letter N
+4F,Latin Capital letter O
+50,Latin Capital letter P
+51,Latin Capital letter Q
+52,Latin Capital letter R
+53,Latin Capital letter S
+54,Latin Capital letter T
+55,Latin Capital letter U
+56,Latin Capital letter V
+57,Latin Capital letter W
+58,Latin Capital letter X
+59,Latin Capital letter Y
+5A,Latin Capital letter Z
+5B,Left Square Bracket
+5C,Backslash
+5D,Right Square Bracket
+5E,Circumflex accent
+5F,Low line
+60,Grave accent
+61,Latin Small Letter A
+62,Latin Small Letter B
+63,Latin Small Letter C
+64,Latin Small Letter D
+65,Latin Small Letter E
+66,Latin Small Letter F
+67,Latin Small Letter G
+68,Latin Small Letter H
+69,Latin Small Letter I
+6A,Latin Small Letter J
+6B,Latin Small Letter K
+6C,Latin Small Letter L
+6D,Latin Small Letter M
+6E,Latin Small Letter N
+6F,Latin Small Letter O
+70,Latin Small Letter P
+71,Latin Small Letter Q
+72,Latin Small Letter R
+73,Latin Small Letter S
+74,Latin Small Letter T
+75,Latin Small Letter U
+76,Latin Small Letter V
+77,Latin Small Letter W
+78,Latin Small Letter X
+79,Latin Small Letter Y
+7A,Latin Small Letter Z
+7B,Left Curly Bracket
+7C,Vertical bar
+7D,Right Curly Bracket
+7E,Tilde
+7F,DELETE

mkfont.sh

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+#!/bin/sh
+usage() {
+	ret_val=$1
+	usage_msg="Creates a new pixel font \n \
+$0 name width height \n \
+"
+	if [ $ret_val -eq 0 ]
+	then
+		echo $usage_msg
+	else
+		echo $usage_msg >&2
+	fi
+	exit $ret_val
+}
+
+if [ "$1" = "-h" ]
+then
+	usage 0
+fi
+
+# Check all params supplied
+if [ $# -ne 3 ]
+then
+	usage 1
+fi
+
+font_name=$1
+font_width=$2
+font_height=$3
+
+# Check width and height are numeric; see
+# https://stackoverflow.com/a/16444570/118592
+case $font_width in
+	(*[!0-9]*|'')
+		echo "Error: Font width must be a number" >&2
+		exit 1
+	;;
+	(*)	
+		: 
+	;;
+esac
+case $font_height in
+	(*[!0-9]*|'')
+		echo "Error: Font height must be a number" >&2
+		exit 1
+	;;
+	(*)	
+		: 
+	;;
+esac
+
+font_dir=$font_name/${font_width}x${font_height}
+
+if [ -d "$font_dir" ]
+then
+	echo "Error: Font already exists" >&2
+	exit 1
+fi
+
+# Create directory structure
+mkdir -p "${font_dir}"
+mkdir -p "${font_dir}/glyphs" 
+mkdir -p "${font_dir}/by-name"
+
+# Create the space glyph
+echo "P1" >> "${font_dir}/glyphs/20.pbm"
+echo "${font_width} ${font_height}" >> "${font_dir}/glyphs/20.pbm"
+j=$font_height
+while [ $j -ne 0 ] ; do
+	i=$font_width
+	while [ $i -ne 0 ] ; do
+		echo -n "0 " >> "${font_dir}/glyphs/20.pbm"
+		i=$(expr $i - 1)
+	done
+	echo >> "${font_dir}/glyphs/20.pbm"
+	j=$(expr $j - 1)
+done
+
+IFS=","
+line_no=1
+while read code_point name
+do
+	if [ $line_no -ne 1 ]
+	then
+		# Make a copy of the space glyph for every other character in
+		# the Basic Latin range
+		cp "${font_dir}/glyphs/20.pbm" "${font_dir}/glyphs/${code_point}.pbm"
+	fi
+	# Create a symlink with the human name for each glyph so it's easier to edit
+	ln -s "../glyphs/${code_point}.pbm" "${font_dir}/by-name/${code_point}-${name}.pbm"
+	line_no=$(expr $line_no + 1)
+done < basic_latin.csv
+