change font linespacing for dummy editor #linux #ttf #qtcreator

README.md

How to change font linespacing

• Reason: want spread lines but Qt Creator has no such option
• Result: https://i.imgsafe.org/7a156ea.png

Manual

You need to manipulate a ttf file. I found such a script that comes with Input font at http://input.fontbureau.com. So we copy DejaVuSansMono ttf files to ~/.fonts/ and create a new font DejaVuSansMonoH. I changed line 147, to match this font name, and run

$ python3 fontfix.py --suffix=H --lineHeight=1.3

Basicly this multiplies some font constants by lineHeight and does sloppy rename s/Mono/MonoH/.

fc-cache -fv - enjoy

fontfix.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

###################################
# from http://input.fontbureau.com/
###################################

# Thanks to Jonas Kjellström and Cody Boisclair for their help in finding bugs in this script!

import re
import os
import sys
import tempfile
from fontTools.ttLib import TTFont, newTable
#from fontTools.ttLib.xmlImport import importXML

doc = """USAGE: python /path/to/inputCustomize.py [INPUT] [--dest=OUTPUT] [OPTIONS]
Use this script to customize one or more Input font files.
Requires TTX/FontTools: <http://sourceforge.net/projects/fonttools/>

If INPUT is missing, it will customize all fonts in the Current Working Directory.
If OUTPUT is missing, it will overwrite the INPUT files.

Options:
    -h, --help              Print this help text, and exit.
    --lineHeight=<float>    A multiplier for the font's built-in line-height.
    --fourStyleFamily       Only works when four INPUT files are provided. 
                            Assigns Regular, Italic, Bold, and Bold Italic names to the 
                            INPUT fonts in the order provided.
    --suffix=<string>       Append a suffix to the font names. Takes a string with no spaces.
    --a=ss                  Swaps alternate single-story 'a' for the default double-story 'a'
    --g=ss                  Swaps alternate single-story 'g' for the default double-story 'a'
    --i=serif               Swaps one of the alternate 'i' for the default in Sans/Mono
        serifs
        serifs_round
        topserif
    --l=serif               Swaps one of the alternate 'l' for the default in Sans/Mono
        serifs
        serifs_round
        topserif
    --zero=slash            Swaps the slashed zero for the default dotted zero
           nodot            Swaps a dotless zero for the default dotted zero
    --asterisk=height       Swaps the mid-height asterisk for the default superscripted asterisk
    --braces=straight       Swaps tamer straight-sided braces for the default super-curly braces

    Example 1:
    $ cd /path/to/the/top/level/of/the/fonts/you/want/to/edit
    $ python /path/to/InputCustomize.py --dest=/path/to/output  --lineHeight=1.5 --suffix=Hack --fourStyleFamily --a=ss --g=ss --i=topserif --l=serifs_round --zero=slash --asterisk=height
    
    Example 2:
    $ cd /path/to/the/top/level/of/the/fonts/you/want/to/edit
    $ python /path/to/InputCustomize.py InputSans-Regular.ttf InputSans-Italic.ttf InputSans-Bold.ttf InputSerif-Regular.ttf --suffix=Hack --fourStyleFamily
"""

class InputModifier(object):
    """
    An object for manipulating Input, takes a TTFont. Sorry this is a little hacky.
    """
    
    def __init__(self, f):
        self.f = f

    def changeLineHeight(self, lineHeight):
        """
        Takes a line height multiplier and changes the line height.
        """
        f = self.f
        baseAsc = f['OS/2'].sTypoAscender
        baseDesc = f['OS/2'].sTypoDescender
        multiplier = float(lineHeight)
        f['hhea'].ascent = round(baseAsc * multiplier)
        f['hhea'].descent = round(baseDesc * multiplier)
        f['OS/2'].usWinAscent = round(baseAsc * multiplier)
        f['OS/2'].usWinDescent = round(baseDesc * multiplier)*-1

    def swap(self, swap):
        """
        Takes a dictionary of glyphs to swap and swaps 'em.
        """
        f = self.f
        glyphNames = f.getGlyphNames()
        maps = {
        'a': {'a': 97, 'aring': 229, 'adieresis': 228, 'acyrillic': 1072, 'aacute': 225, 'amacron': 257, 'agrave': 224, 'atilde': 227, 'acircumflex': 226, 'aogonek': 261, 'abreve': 259},
        'g':  {'gdotaccent': 289, 'gbreve': 287, 'gcircumflex': 285, 'gcommaaccent': 291, 'g': 103},
        'i':  {'i': 105, 'iacute': 237, 'iogonek': 303, 'igrave': 236, 'itilde': 297, 'icircumflex': 238, 'imacron': 299, 'ij': 307, 'ibreve': 301, 'yicyrillic': 1111, 'idieresis': 239, 'icyrillic': 1110},
        'l':  {'l': 108, 'lcaron': 318, 'lcommaaccent': 316, 'lacute': 314, 'lslash': 322, 'dotlessi': 305, 'ldot': 320},
        'zero': {'zero': 48},
        'asterisk':  {'asterisk': 42},
        'braces': {'braceleft': 123, 'braceright': 125}
        }
        swapMap = {}
        for k, v in list(swap.items()):
            for gname, u in list(maps[k].items()):
                newGname = gname + '.salt_' + v
                if newGname in glyphNames:
                    swapMap[gname] = newGname
        for table in f['cmap'].tables:
            cmap = table.cmap
            for u, gname in list(cmap.items()):
                if gname in swapMap:
                    cmap[u] = swapMap[gname]

    def fourStyleFamily(self, position, suffix=None):
        """
        Replaces the name table and certain OS/2 values with those that will make a four-style family.
        """
        f = self.f
        source = TTFont(fourStyleFamilySources[position])

        tf = tempfile.mkstemp()
        pathToXML = tf[1]
        source.saveXML(pathToXML, tables=['name'])
        os.close(tf[0])
        
        with open(pathToXML, "r") as temp:
            xml = temp.read()

        # make the changes
        if suffix:
            xml = xml.replace("Input", "Input" + suffix)

        # save the table
        with open(pathToXML, 'w') as temp:
            temp.write(xml)
            temp.write('\r')

        f['OS/2'].usWeightClass = source['OS/2'].usWeightClass
        f['OS/2'].fsType = source['OS/2'].fsType

        # write the table
        f['name'] = newTable('name')
        f.importXML(pathToXML)
    
    def changeNames(self, suffix=None):
        # this is a similar process to fourStyleFamily()
        
        tf = tempfile.mkstemp()
        pathToXML = tf[1]
        f.saveXML(pathToXML, tables=['name'])
        os.close(tf[0])
        
        with open(pathToXML, "r") as temp:
            xml = temp.read()

        # make the changes
        if suffix:
            xml = xml.replace("Mono", "Mono" + suffix)

        # save the table
        with open(pathToXML, 'w') as temp:
            temp.write(xml)
            temp.write('\r')
        
        # write the table
        f['name'] = newTable('name')
        f.importXML(pathToXML)




            
baseTemplatePath = os.path.split(__file__)[0]
fourStyleFamilySources = [
    os.path.join(baseTemplatePath, '_template_Regular.txt'),
    os.path.join(baseTemplatePath, '_template_Italic.txt'),
    os.path.join(baseTemplatePath, '_template_Bold.txt'),
    os.path.join(baseTemplatePath, '_template_BoldItalic.txt'),
]

fourStyleFileNameAppend = [ 'Regular', 'Italic', 'Bold', 'BoldItalic' ]

if __name__ == "__main__":
    
    # Get command-line arguments
    go = True
    arguments = sys.argv[1:]
    paths = []
    swap = {}
    lineHeight = None
    fourStyleFamily = None
    suffix = None
    destBase = None


    # parse arguments
    for argument in arguments:
        key = None
        value = None
        if len(argument.split('=')) == 2:
            key, value = argument.split('=')
            key = key[2:]
        elif argument[0:2] == '--':
            key = argument[2:]
            value = True
        elif argument == '-h':
            print(doc)
            go = False
        else:
            key = argument
            value = None
        # assign preference variables
        if value is None:
            paths.append(key)
        elif key == 'lineHeight':
            lineHeight = value
        elif key == 'fourStyleFamily':
            fourStyleFamily = True
        elif key == 'suffix':
            suffix = value
        elif key == 'dest':
            destBase = value
        elif key == 'help':
            print(doc)
            go = False
        else:
            swap[key] = value
    
    # account for arguments where no value is given (for example, '--a' instead of '--a=ss')
    if swap.get('a') is True:
            swap['a'] = 'ss'
    if swap.get('g') is True:
            swap['g'] = 'ss'
    if swap.get('i') is True:
            swap['i'] = 'serifs'
    if swap.get('l') is True:
            swap['l'] = 'serifs'
    if swap.get('zero') is True:
            swap['zero'] = 'slash'
    if swap.get('asterisk') is True:
            swap['asterisk'] = 'height'
    if swap.get('braces') is True:
            swap['braces'] = 'straight'

    
    # if specific paths were not supplied, collect them from the current directory
    if not paths:
        for root, dirs, files in os.walk(os.getcwd()):
            for filename in files:
                basePath, ext = os.path.splitext(filename)
                if ext in ['.otf', '.ttf']:
                    paths.append(os.path.join(root, filename))

    # if four paths were not supplied, do not process as a four-style family
    if len(paths) != 4:
        fourStyleFamily = None

    if go:
        for i, path in enumerate(paths):
            print(os.path.split(path)[1])
            f = TTFont(path)
            c = InputModifier(f)
            if lineHeight:
                c.changeLineHeight(lineHeight)
            if swap:
                c.swap(swap)
            if fourStyleFamily:
                c.fourStyleFamily(i, suffix)
                base, ext = os.path.splitext(path)
                path = base + '_as_' + fourStyleFileNameAppend[i] + ext
            elif suffix:
                c.changeNames(suffix)
            if destBase:
                baseScrap, fileAndExt = os.path.split(path)
                destPath = os.path.join(destBase, fileAndExt)
            else:
                destPath = path
            try:
                os.remove(destPath)
            except:
                pass
                
            # Take care of that weird "post" table issue, just in case. Delta#1
            try:
                del f['post'].mapping['Delta#1']
            except:
                pass
                
            f.save(destPath)
        print('done')