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#!/usr/bin/fontforge
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This script uses FontForge to strip unused symbols from a TrueType font.
# Only symbols in code page 437 and two glyphs used by GRUB are left in.
#
# Usage
#
#     ./437.ff <font_in> <font_out.ttf>
#
# e.g.
#
#     ./437.ff dejavu-fonts-2.37/src/DejaVuSansMono.sfd dejavu_mono.ttf
#
# or
#
#     ./437.ff /usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf dejavu_mono.ttf

Print()
Print("Strip unused symbols from TrueType font")
if ($argc != 3)
	Print()
	Print("Usage:")
	Print($0, " <font_in> <font_out.ttf>")
	return
endif

Print("Loading ", $1)
Open($1)

# Code page 437
SelectMore("u263A") # WHITE SMILING FACE
SelectMore("u263B") # BLACK SMILING FACE
SelectMore("u2665") # BLACK HEART SUIT
SelectMore("u2666") # BLACK DIAMOND SUIT
SelectMore("u2663") # BLACK CLUB SUIT
SelectMore("u2660") # BLACK SPADE SUIT
SelectMore("u2022") # BULLET
SelectMore("u25D8") # INVERSE BULLET
SelectMore("u25CB") # WHITE CIRCLE
SelectMore("u25D9") # INVERSE WHITE CIRCLE
SelectMore("u2642") # MALE SIGN
SelectMore("u2640") # FEMALE SIGN
SelectMore("u266A") # EIGHTH NOTE
SelectMore("u266B") # BEAMED EIGHTH NOTES
SelectMore("u263C") # WHITE SUN WITH RAYS
SelectMore("u25BA") # BLACK RIGHT-POINTING POINTER
SelectMore("u25C4") # BLACK LEFT-POINTING POINTER
SelectMore("u2195") # UP DOWN ARROW
SelectMore("u203C") # DOUBLE EXCLAMATION MARK
SelectMore("u00B6") # PILCROW SIGN
SelectMore("u00A7") # SECTION SIGN
SelectMore("u25AC") # BLACK RECTANGLE
SelectMore("u21A8") # UP DOWN ARROW WITH BASE
SelectMore("u2191") # UPWARDS ARROW
SelectMore("u2193") # DOWNWARDS ARROW
SelectMore("u2192") # RIGHTWARDS ARROW
SelectMore("u2190") # LEFTWARDS ARROW
SelectMore("u221F") # RIGHT ANGLE
SelectMore("u2194") # LEFT RIGHT ARROW
SelectMore("u25B2") # BLACK UP-POINTING TRIANGLE
SelectMore("u25BC") # BLACK DOWN-POINTING TRIANGLE
SelectMore("u0020") # SPACE
SelectMore("u0021")
SelectMore("u0022")
SelectMore("u0023")
SelectMore("u0024")
SelectMore("u0025")
SelectMore("u0026")
SelectMore("u0027")
SelectMore("u0028")
SelectMore("u0029")
SelectMore("u002a")
SelectMore("u002b")
SelectMore("u002c")
SelectMore("u002d")
SelectMore("u002e")
SelectMore("u002f")
SelectMore("u0030")
SelectMore("u0031")
SelectMore("u0032")
SelectMore("u0033")
SelectMore("u0034")
SelectMore("u0035")
SelectMore("u0036")
SelectMore("u0037")
SelectMore("u0038")
SelectMore("u0039")
SelectMore("u003a")
SelectMore("u003b")
SelectMore("u003c")
SelectMore("u003d")
SelectMore("u003e")
SelectMore("u003f")
SelectMore("u0040")
SelectMore("u0041")
SelectMore("u0042")
SelectMore("u0043")
SelectMore("u0044")
SelectMore("u0045")
SelectMore("u0046")
SelectMore("u0047")
SelectMore("u0048")
SelectMore("u0049")
SelectMore("u004a")
SelectMore("u004b")
SelectMore("u004c")
SelectMore("u004d")
SelectMore("u004e")
SelectMore("u004f")
SelectMore("u0050")
SelectMore("u0051")
SelectMore("u0052")
SelectMore("u0053")
SelectMore("u0054")
SelectMore("u0055")
SelectMore("u0056")
SelectMore("u0057")
SelectMore("u0058")
SelectMore("u0059")
SelectMore("u005a")
SelectMore("u005b")
SelectMore("u005c")
SelectMore("u005d")
SelectMore("u005e")
SelectMore("u005f")
SelectMore("u0060")
SelectMore("u0061")
SelectMore("u0062")
SelectMore("u0063")
SelectMore("u0064")
SelectMore("u0065")
SelectMore("u0066")
SelectMore("u0067")
SelectMore("u0068")
SelectMore("u0069")
SelectMore("u006a")
SelectMore("u006b")
SelectMore("u006c")
SelectMore("u006d")
SelectMore("u006e")
SelectMore("u006f")
SelectMore("u0070")
SelectMore("u0071")
SelectMore("u0072")
SelectMore("u0073")
SelectMore("u0074")
SelectMore("u0075")
SelectMore("u0076")
SelectMore("u0077")
SelectMore("u0078")
SelectMore("u0079")
SelectMore("u007a")
SelectMore("u007b")
SelectMore("u007c")
SelectMore("u007d")
SelectMore("u007e")
SelectMore("u00c7")
SelectMore("u00fc")
SelectMore("u00e9")
SelectMore("u00e2")
SelectMore("u00e4")
SelectMore("u00e0")
SelectMore("u00e5")
SelectMore("u00e7")
SelectMore("u00ea")
SelectMore("u00eb")
SelectMore("u00e8")
SelectMore("u00ef")
SelectMore("u00ee")
SelectMore("u00ec")
SelectMore("u00c4")
SelectMore("u00c5")
SelectMore("u00c9")
SelectMore("u00e6")
SelectMore("u00c6")
SelectMore("u00f4")
SelectMore("u00f6")
SelectMore("u00f2")
SelectMore("u00fb")
SelectMore("u00f9")
SelectMore("u00ff")
SelectMore("u00d6")
SelectMore("u00dc")
SelectMore("u00a2")
SelectMore("u00a3")
SelectMore("u00a5")
SelectMore("u20a7")
SelectMore("u0192")
SelectMore("u00e1")
SelectMore("u00ed")
SelectMore("u00f3")
SelectMore("u00fa")
SelectMore("u00f1")
SelectMore("u00d1")
SelectMore("u00aa")
SelectMore("u00ba")
SelectMore("u00bf")
SelectMore("u2310")
SelectMore("u00ac")
SelectMore("u00bd")
SelectMore("u00bc")
SelectMore("u00a1")
SelectMore("u00ab")
SelectMore("u00bb")
SelectMore("u2591")
SelectMore("u2592")
SelectMore("u2593")
SelectMore("u2502")
SelectMore("u2524")
SelectMore("u2561")
SelectMore("u2562")
SelectMore("u2556")
SelectMore("u2555")
SelectMore("u2563")
SelectMore("u2551")
SelectMore("u2557")
SelectMore("u255d")
SelectMore("u255c")
SelectMore("u255b")
SelectMore("u2510")
SelectMore("u2514")
SelectMore("u2534")
SelectMore("u252c")
SelectMore("u251c")
SelectMore("u2500")
SelectMore("u253c")
SelectMore("u255e")
SelectMore("u255f")
SelectMore("u255a")
SelectMore("u2554")
SelectMore("u2569")
SelectMore("u2566")
SelectMore("u2560")
SelectMore("u2550")
SelectMore("u256c")
SelectMore("u2567")
SelectMore("u2568")
SelectMore("u2564")
SelectMore("u2565")
SelectMore("u2559")
SelectMore("u2558")
SelectMore("u2552")
SelectMore("u2553")
SelectMore("u256b")
SelectMore("u256a")
SelectMore("u2518")
SelectMore("u250c")
SelectMore("u2588")
SelectMore("u2584")
SelectMore("u258c")
SelectMore("u2590")
SelectMore("u2580")
SelectMore("u03b1")
SelectMore("u00df")
SelectMore("u0393")
SelectMore("u03c0")
SelectMore("u03a3")
SelectMore("u03c3")
SelectMore("u00b5")
SelectMore("u03c4")
SelectMore("u03a6")
SelectMore("u0398")
SelectMore("u03a9")
SelectMore("u03b4")
SelectMore("u221e")
SelectMore("u03c6")
SelectMore("u03b5")
SelectMore("u2229")
SelectMore("u2261")
SelectMore("u00b1")
SelectMore("u2265")
SelectMore("u2264")
SelectMore("u2320")
SelectMore("u2321")
SelectMore("u00f7")
SelectMore("u2248")
SelectMore("u00b0")
SelectMore("u2219")
SelectMore("u00b7")
SelectMore("u221a")
SelectMore("u207f")
SelectMore("u00b2")
SelectMore("u25a0")
SelectMore("u00a0")

SelectInvert()
DetachAndRemoveGlyphs()

Print("Saving ", $2)
Generate($2)