fix-consolas-sorry-its-fugly-and-uses-hard-coded-font-names.sh

#!/bin/bash
# XXX not my work, just keeping it here for everyone to see, -fritschy

# Based in part on https://wincent.com/wiki/Fixing_the_baseline_on_the_Consolas_font_on_OS_X

function fail()
{
  local error=${1:-Unknown error}
  echo "Failed! $error"
  exit 1
}

# Check for ttx and xmlstarlet
# Get ttx: sudo apt install fonttools
# Get xmlstarlet: sudo apt install xmlstarlet
[[ -z "`which ttx`" || -z "`which xmlstarlet`" ]] && fail "\"$tool\" was not found in your PATH"

# Loop over Consolas fonts
for font in 'Consolas Regular' 'Consolas Italic' 'Consolas Bold' 'Consolas Bold Italic'; do
  if [ -f "$font.ttf" ]; then
    # Dump font tables into .ttx XML file
    ttx "$font.ttf"
    [ $? -ne 0 ] && fail "ttx returned non-zero while processing $font"

    # Validate the .ttx XML file
    xmlstarlet val "$font.ttx"
    [ $? -ne 0 ] && fail "$font.ttx is not valid XML"

    # Update the ascent, descent, and lineGap values in the Horizontal Header (hhea) table
    xmlstarlet ed -L -u "/ttFont/hhea/ascent/@value" -v "1884" "$font.ttx"
    xmlstarlet ed -L -u "/ttFont/hhea/descent/@value" -v "-514" "$font.ttx"
    xmlstarlet ed -L -u "/ttFont/hhea/lineGap/@value" -v "0" "$font.ttx"

    # Delete the digital signature (DSIG) table, since the
    # modified font will no longer match the original signature
    xmlstarlet ed -L -d "/ttFont/DSIG" "$font.ttx"

    # Rewrite the font from the .ttx file
    ttx "$font.ttx"
  fi
done