Invoice linting

invoicing/lint

+#!/usr/bin/env python3
+
+# Lint an invoice.  So far, this just makes sure dates match.
+
+import datetime
+import dateparser
+import os
+from pathlib import Path
+import sys
+
+def date2ref(datestr:str, fname:Path):
+    return dateparser.parse(datestr).strftime("%Y%m%d") + "-" + fname.split("-")[1]
+
+def get_text_in_braces(line:str):
+    """Return text between first set of curly braces"""
+    return line.split("{")[1].split("}")[0]
+
+def lint_invoice(fname:Path) -> bool:
+    """Return True if lint passes, else false"""
+
+    invoice = fname.read_text()
+    for line in invoice.split("\n"):
+        if line.startswith(r"\date"):
+            datestr = get_text_in_braces(line)
+        elif line.startswith(r"\myref"):
+            myref = get_text_in_braces(line)
+
+
+    if fname.name != myref+".ltx":
+        sys.stderr.write("lint FAIL: Filename date/serial doesn't match myref date/serial\n")
+        return False
+    elif date2ref(datestr, fname.stem) != myref:
+        sys.stderr.write(f"lint FAIL: {datestr}, {myref}, and {fname.name} do not agree.\n")
+        return False
+
+    return True
+
+def lint_dir(direc:Path) -> bool:
+    for fname in direc.iterdir():
+        if fname.suffix == ".ltx":
+            if not lint_invoice(fname):
+                return False
+    return True
+
+sys.exit(not lint_dir(Path(os.getcwd())))