New EPUB builder, other minor changes.

[librarian.git] / src / librarian / fonts.py

diff --git a/src/librarian/fonts.py b/src/librarian/fonts.py
new file mode 100644 (file)
index 0000000..adaeae4
--- /dev/null
+++ b/src/librarian/fonts.py
@@ -0,0 +1,38 @@
+import os
+from shutil import rmtree
+import subprocess
+from tempfile import mkdtemp
+
+
+def strip_font(path, chars, verbose=False):
+    tmpdir = mkdtemp('-librarian-epub')
+    try:
+        cwd = os.getcwd()
+    except OSError:
+        cwd = None
+
+    os.chdir(os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                          'font-optimizer'))
+    optimizer_call = [
+        'perl', 'subset.pl', '--chars',
+        ''.join(chars).encode('utf-8'),
+        path,
+        os.path.join(tmpdir, 'font.ttf')
+    ]
+    env = {"PERL_USE_UNSAFE_INC": "1"}
+    if verbose:
+        print("Running font-optimizer")
+        subprocess.check_call(optimizer_call, env=env)
+    else:
+        dev_null = open(os.devnull, 'w')
+        subprocess.check_call(optimizer_call, stdout=dev_null,
+                              stderr=dev_null, env=env)
+    with open(os.path.join(tmpdir, 'font.ttf'), 'rb') as f:
+        content = f.read()
+
+    rmtree(tmpdir)
+
+    if cwd is not None:
+        os.chdir(cwd)
+
+    return content