row_heights (#77)

Implements row heights and a command-line option `-F nn` for fteapot to set the general font size.

Also improves documentation and uniformizes key bindings somewhat between teapot and fteapot.

Resolves #57.

Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Reviewed-on: #77

src/tools/interpolate.py

@@ -0,0 +1,39 @@
+# To get around the fact that fluid only allows numerical constants
+# in some places that expressions would be preferred, this
+# file takes a fluid file which may contain numerical constants of the form
+#
+# 9999NNN/*REPLACEMENT*/
+#
+# where the NNN are distinct digit sequences (of any length)
+# and the corresponding fluid output and replaces any 9999NNN in the output
+# with REPLACEMENT (which can of course be any text). Note that the
+# entire numerical constant with its replacement comment must occur within
+# a single line of the fluid file. The result is written
+# to a new output file with the literal string `_interpolated` interpolated
+# before its extension.
+
+from pathlib import Path
+import re
+import sys
+
+fluidin = sys.argv[1]
+genfile = Path(sys.argv[2])
+outfile = genfile.with_stem(genfile.stem + '_interpolated')
+
+# First collect all of the replacements from the fluidfile
+replacerPattern = re.compile(r"(9999\d*)/[*](.*)[*]/")
+replacement = {}
+with open(fluidin) as fluidf:
+    for line in fluidf:
+        foundpat = replacerPattern.search(line)
+        if foundpat:
+            replacement[foundpat[1]] = foundpat[2]
+
+# Now make all replacements in the generated file
+with open(outfile, 'w') as outf:
+    with open(genfile) as genf:
+        for line in genf:
+            line = line[:-1]
+            for key in replacement:
+                line = line.replace(key, replacement[key])
+            print(line, file=outf)