fix(fonts): update fonts dependencies (#2866)

* fix(fonts): update fonts dependencies

* chore(fonts): fix buildMetrics for Python 3

* fix(fonts): update fonts

* test: update screenshots

* docs: update reference to katex-fonts

* chore: use Python 3

* fix(fonts): update fonts

* test: update screenshots

* Use explicit path

* Command-line arguments aren't actually supported

* Small buildMetrics fixes

* Add build:{fonts,metrics} script

* Lock versions of font-related dependencies

* Install minimal texlive

* Install fontforge

Co-authored-by: Erik Demaine <edemaine@mit.edu>

src/metrics/README.md

@@ -17,7 +17,7 @@ There are several requirements for generating the metrics used by KaTeX.
 
 Once you have these things, run the following command from the root directory:
 
-    sh ./docker/fonts/buildMetrics.sh
+    sh ./dockers/fonts/buildMetrics.sh
 
 which should generate new metrics and place them into `fontMetricsData.json`.
 You're done!

src/metrics/extract_tfms.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import collections
 import json
@@ -74,8 +74,8 @@ def main():
 
     families = collections.defaultdict(dict)
 
-    for family, chars in mapping.iteritems():
-        for char, char_data in chars.iteritems():
+    for family, chars in mapping.items():
+        for char, char_data in chars.items():
             char_num = int(char)
 
             font = char_data['font']

src/metrics/extract_ttfs.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from fontTools.ttLib import TTFont
 import sys
@@ -76,7 +76,7 @@ def main():
         chars[u"\u0020"] = None  # space
         chars[u"\u00a0"] = None  # nbsp
 
-        for char, base_char in chars.iteritems():
+        for char, base_char in chars.items():
             code = ord(char)
             names = set(t.get(code) for t in cmap)
             if not names:

src/metrics/format_json.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 import json