New version of fontbuild which addresses several issues

Fixes for things that stopped working when we updated fontmake:
- restore glyph decomposition for VF
- restore glyph overlap removal for VF
- restore version metadata writing for VF

Improvements for VF
- fix "full name" name table entry to say "Inter" instead of "Inter Regular"

New and changed:
- "rename" command for renaming metadata like family and style, optionally
  saving a separate file. Used to produce new "Inter V" family.
- The "build" command no longer performs "style name compactation" for
  Google fonts. Instead, the new "rename" command is used.

Closes #198
Closes #202

1 files changed, 148 insertions, 0 deletions

diff --git a/misc/tools/font_names.py b/misc/tools/font_names.py
new file mode 100644
index 000000000..c321ca673
--- /dev/null
+++ b/misc/tools/font_names.py
@@ -0,0 +1,148 @@
+#!/usr/bin/env python
+from fontTools.ttLib import TTFont
+import os, sys, re
+
+# Adoptation of fonttools/blob/master/Snippets/rename-fonts.py
+
+WINDOWS_ENGLISH_IDS = 3, 1, 0x409
+MAC_ROMAN_IDS = 1, 0, 0
+
+LEGACY_FAMILY      = 1
+TRUETYPE_UNIQUE_ID = 3
+FULL_NAME          = 4
+POSTSCRIPT_NAME    = 6
+PREFERRED_FAMILY   = 16
+SUBFAMILY_NAME     = 17
+WWS_FAMILY         = 21
+
+
+FAMILY_RELATED_IDS = set([
+  LEGACY_FAMILY,
+  TRUETYPE_UNIQUE_ID,
+  FULL_NAME,
+  POSTSCRIPT_NAME,
+  PREFERRED_FAMILY,
+  WWS_FAMILY,
+])
+
+whitespace_re = re.compile(r'\s+')
+
+
+def removeWhitespace(s):
+  return whitespace_re.sub("", s)
+
+
+def setFullName(font, fullName):
+  nameTable = font["name"]
+  nameTable.setName(fullName, FULL_NAME, 1, 0, 0)     # mac
+  nameTable.setName(fullName, FULL_NAME, 3, 1, 0x409) # windows
+
+
+def getFamilyName(font):
+  nameTable = font["name"]
+  r = None
+  for plat_id, enc_id, lang_id in (WINDOWS_ENGLISH_IDS, MAC_ROMAN_IDS):
+    for name_id in (PREFERRED_FAMILY, LEGACY_FAMILY):
+      r = nameTable.getName(nameID=name_id, platformID=plat_id, platEncID=enc_id, langID=lang_id)
+      if r is not None:
+        break
+    if r is not None:
+      break
+  if not r:
+    raise ValueError("family name not found")
+  return r.toUnicode()
+
+
+def removeWhitespaceFromStyles(font):
+  familyName = getFamilyName(font)
+
+  # collect subfamily (style) name IDs for variable font's named instances
+  vfInstanceSubfamilyNameIds = set()
+  if "fvar" in font:
+    for namedInstance in font["fvar"].instances:
+      vfInstanceSubfamilyNameIds.add(namedInstance.subfamilyNameID)
+
+  nameTable = font["name"]
+  for rec in nameTable.names:
+    rid = rec.nameID
+    if rid in (FULL_NAME, LEGACY_FAMILY):
+      # style part of family name
+      s = rec.toUnicode()
+      start = s.find(familyName)
+      if start != -1:
+        s = familyName + " " + removeWhitespace(s[start + len(familyName):])
+      else:
+        s = removeWhitespace(s)
+      rec.string = s
+    if rid in (SUBFAMILY_NAME,) or rid in vfInstanceSubfamilyNameIds:
+      rec.string = removeWhitespace(rec.toUnicode())
+    # else: ignore standard names unrelated to style
+
+
+def setFamilyName(font, nextFamilyName):
+  prevFamilyName = getFamilyName(font)
+  if prevFamilyName == nextFamilyName:
+    return
+    # raise Exception("identical family name")
+
+  def renameRecord(nameRecord, prevFamilyName, nextFamilyName):
+    # replaces prevFamilyName with nextFamilyName in nameRecord
+    s = nameRecord.toUnicode()
+    start = s.find(prevFamilyName)
+    if start != -1:
+      end = start + len(prevFamilyName)
+      nextFamilyName = s[:start] + nextFamilyName + s[end:]
+    nameRecord.string = nextFamilyName
+    return s, nextFamilyName
+
+  # postcript name can't contain spaces
+  psPrevFamilyName = prevFamilyName.replace(" ", "")
+  psNextFamilyName = nextFamilyName.replace(" ", "")
+  for rec in font["name"].names:
+    name_id = rec.nameID
+    if name_id not in FAMILY_RELATED_IDS:
+      # leave uninteresting records unmodified
+      continue
+    if name_id == POSTSCRIPT_NAME:
+      old, new = renameRecord(rec, psPrevFamilyName, psNextFamilyName)
+    elif name_id == TRUETYPE_UNIQUE_ID:
+      # The Truetype Unique ID rec may contain either the PostScript Name or the Full Name
+      if psPrevFamilyName in rec.toUnicode():
+        # Note: This is flawed -- a font called "Foo" renamed to "Bar Lol";
+        # if this record is not a PS record, it will incorrectly be rename "BarLol".
+        # However, in practice this is not abig deal since it's just an ID.
+        old, new = renameRecord(rec, psPrevFamilyName, psNextFamilyName)
+      else:
+        old, new = renameRecord(rec, prevFamilyName, nextFamilyName)
+    else:
+      old, new = renameRecord(rec, prevFamilyName, nextFamilyName)
+    # print("  %r: '%s' -> '%s'" % (rec, old, new))
+
+
+
+def loadFont(file):
+  return TTFont(file, recalcBBoxes=False, recalcTimestamp=False)
+
+
+def renameFontFamily(infile, outfile, newFamilyName):
+  font = loadFont(infile)
+  setFamilyName(font, newFamilyName)
+  # print('write "%s"' % outfile)
+  font.save(outfile)
+  font.close()
+
+
+
+def main():
+  infile = "./build/fonts/var/Inter.var.ttf"
+  outfile = "./build/tmp/var2.otf"
+  renameFontFamily(infile, outfile, "Inter V")
+  print("%s familyName: %r" % (infile, getFamilyName(loadFont(infile)) ))
+  print("%s familyName: %r" % (outfile, getFamilyName(loadFont(outfile)) ))
+
+if __name__ == "__main__":
+  sys.exit(main())
+
+# Similar to:
+# ttx -i -e -o ./build/tmp/var.ttx ./build/fonts/var/Inter.var.ttf
+# ttx -b --no-recalc-timestamp -o ./build/tmp/var.otf ./build/tmp/var.ttx