Move scripts to a .scripts/ directory.

.gitignore

@@ -7,3 +7,4 @@ venv/
 .potodo/
 locales/
 .venv/
+.envrc

.scripts/line-length.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+"""Measure line length in given files, run as:
+
+    python line-length.py *.po
+
+It does not count zero-width caracters from the Mn Unicode category
+(Nonspacing Mark).
+
+It returns 0 on success, 1 on failure.
+"""
+
+from unicodedata import category
+import fileinput
+import sys
+
+SOFT_LIMIT = 80  # used for splitables lines (with spaces in them)
+HARD_LIMIT = 88  # used for non-splitables lines (without spaces in them)
+
+
+def clean(line):
+    return "".join(char for char in line if category(char) != "Mn").rstrip("\n")
+
+
+return_code = 0
+
+for line in fileinput.input(encoding="utf-8"):
+    line = clean(line)
+    limit = SOFT_LIMIT if line.count(" ") > 1 else HARD_LIMIT
+    if len(line) > limit:
+        print(
+            f"{fileinput.filename()}:{fileinput.filelineno()} line too long "
+            f"({len(line)} > {limit} characters)",
+            file=sys.stderr,
+        )
+        return_code = 1
+
+
+sys.exit(return_code)

Makefile

@@ -150,18 +150,7 @@ spell: ensure_test_prerequisites $(DESTS)
 .PHONY: line-length
 line-length:
 	@echo "Searching for long lines..."
-# soft limit is used for splitables lines (with spaces in them)
-# hard limit is used for non-splitables lines (without spaces in them)
-	@python -c 'soft_limit=80; \
-	hard_limit=88; \
-	from unicodedata import category; \
-	import fileinput as fi; \
-	clean = lambda line: "".join(char for char in line if category(char) != "Mn").strip(); \
-	[print(f"""{fi.filename()}:{fi.filelineno()} line too long ({len(line)} > {soft_limit if line.count(" ") > 1 else hard_limit} characters)""") \
-	for _line in fi.input(encoding="utf-8") \
-	for line in [clean(_line)] \
-	if line.count(" ") > 1 and len(line) > soft_limit or line.count(" ") <= 1 and len(line) > hard_limit]' \
-	*.po */*.po
+	@python .scripts/line-length.py *.po */*.po
 
 .PHONY: sphinx-lint
 sphinx-lint: ensure_test_prerequisites