Python linting script

.lint.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+
+import sys
+import argparse
+import re
+
+parser = argparse.ArgumentParser(description='Lint markdown drafts.')
+parser.add_argument('files', metavar='file', nargs='+', help='Files to lint')
+parser.add_argument('-l', dest='maxLineLength', default=80)
+parser.add_argument('-f', dest='maxFigureLineLength', default=65)
+
+args = parser.parse_args()
+
+foundError = False
+
+for inputfile in args.files:
+    insideFigure = False
+    beforeAbstract = True
+    with open(inputfile, 'U') as draft:
+        linecounter = 1
+        lines = draft.readlines()
+
+        abstract = re.compile('^--- abstract')
+        table = re.compile('^\s*(?:\||{:)')
+        figure = re.compile('^[~`]{3}')
+
+        for line in lines:
+            line = line.rstrip('\r\n')
+            linenumber = linecounter
+            linecounter += 1
+
+            # Skip everything before abstract
+            if beforeAbstract:
+                matchObj = abstract.match(line)
+                if matchObj:
+                    beforeAbstract = False
+                continue
+
+            # Skip tables
+            matchObj = table.match(line)
+            if matchObj:
+                continue
+
+            # Toggle figure state
+            matchObj = figure.match(line)
+            if matchObj:
+                insideFigure = not insideFigure
+                continue
+
+            # Check length
+            length = len(line)
+            limit = args.maxFigureLineLength if insideFigure else args.maxLineLength
+            if length > limit:
+                foundError = True
+                sys.stderr.write("{0}: Line is {1} characters; limit is {2}\n".format(
+                    linenumber, length, limit))
+                sys.stderr.write("{0}\n".format(line))
+
+sys.exit(1 if foundError else 0)

Makefile

@@ -14,15 +14,8 @@ endif
 
 latest:: lint
 .PHONY: lint
+
+PYTHON := $(or $(shell which python3),$(shell which python))
+
 lint::
-	@err=0; for f in draft-*.md ; do \
-	  if cat "$$f" | (l=0; while read -r a; do l=$$(($$l + 1)); echo -E "$$l:$$a"; done) | \
-	     sed -e '1,/--- abstract/d;/^[0-9]*: *|/d' | tr -d '\r' | grep '^[0-9]*:.\{81\}'; then \
-	    echo "$$f contains a line with >80 characters"; err=1; \
-	  fi; \
-	  if cat "$$f" | (l=0; while read -r a; do l=$$(($$l + 1)); echo -E "$$l:$$a"; done) | \
-	     sed -e '/^[0-9]*:~~~/,/^[0-9]*:~~~/p;/^[0-9]*:```/,/^[0-9]*:```/p;d' | \
-	     tr -d '\r' | grep '^[0-9]*:.\{66\}'; then \
-	    echo "$$f contains a figure with >65 characters"; err=1; \
-	  fi; \
-	done; [ "$$err" -eq 0 ]
+	@$(PYTHON) ./.lint.py draft-*.md