#!/usr/bin/env bash

# Generate font files with FontForge, and a CSS declaration for this font.

if ! type fontforge &> /dev/null; then echo "ERROR: Missing dependency: fontforge" 1>&2; exit 1; fi

basename=$1
ttf="${basename}.ttf"
otf="OTF/${basename}.otf"

echo -e "\e[1;37mGenerating ${basename}... \e[0m"

output=$(fontforge -lang=py -script - <<EOF
import fontforge;

font = fontforge.open("Sources/${basename}.sfd");

# Extract interesting informations
$(if [[ "$(python --version 2>&1 | cut -d' ' -f2- | cut -c1)" == "3" ]]; then
  echo 'print(font.fontname)'
  echo 'print(font.familyname)'
  echo 'print(font.fullname)'
  echo 'print(font.os2_weight)'
  echo 'print(font.italicangle)'
else
  echo 'print font.fontname'
  echo 'print font.familyname'
  echo 'print font.fullname'
  echo 'print font.os2_weight'
  echo 'print font.italicangle'
fi)

bitmask = font.validate();
if bitmask != 0:
  exit(42);

font.generate("${basename}.ttf", flags=("opentype", "dummy-dsig"));
font.generate("OTF/${basename}.otf", flags=("opentype", "dummy-dsig"));
font.generate("Webfonts/${basename}.svg");

EOF
)
error=$?

old_IFS="$IFS"
IFS='
'
output=($output)
IFS="$old_IFS"

fontname=${output[0]}
familyname=${output[1]}
fullname=${output[2]}
fontweight=${output[3]}
slope=${output[4]}
if [ x"$slope" = "x0.0" ]; then
  fontstyle=normal
else
  fontstyle=italic
fi

cat > Webfonts/${basename}-decl.css <<EOF
@font-face {
  font-family: '${familyname}';
  src: url('${basename}.eot'); /* IE 9 Compatibility Mode */
  src: url('${basename}.eot?#iefix') format('embedded-opentype'), /* IE < 9 */
       url('${basename}.woff') format('woff'), /* Firefox >= 3.6, any other modern browser */
       url('${basename}.ttf') format('truetype'), /* Safari, Android, iOS */
       url('${basename}.svg#${fontname}') format('svg'); /* Chrome < 4, Legacy iOS */
  font-weight: ${fontweight};
  font-style: ${fontstyle};
}
EOF

if [ "x$error" != "x0" ]; then
  echo -e "\e[1;31mError in ${basename}.\e[0m"
  if [ "x$error" = "x42" ]; then
    echo "Font ${basename}.sfd is not valid"
  fi
else
  echo -e "\e[1;32m${basename} OK.\e[0m"
fi

exit $error