Script to display compiler output messages in BBEdit browser window

bberrors.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

# BBErrors: Script to display compiler output messages in BBEdit browser window
# Copyright Jay Lieske Jr.
# 14 July 2012

import sys, re, os

if sys.stdin.isatty():
    print "usage: ... | bberrors"
    print "Filters standard input for compiler error messages, "
    print "and tells BBEdit to display the messages in an error browser window."
    sys.exit(1)

# Matches just the error messages from the compiler:
# a file name, followed by a colon and line number, an optional column number,
# and then the error message.
# Since BBEdit doesn't accept column numbers, it doesn't try to parse
# other positional feedback from the compiler.
# To avoid false matches, this version doesn't allow spaces in file names.
pat = re.compile(r"^([^: ]+):(\d+)(?:[.:-]\d+)*[:\s]+(.+)$")

# Distinguish warning from errors.
warning = re.compile(r"warning", re.IGNORECASE)

# Accumulate the set of errors found on stdin.
errors = []
for line in sys.stdin:
    sys.stdout.write(line) # echo everything
    match = pat.match(line)
    if match:
        file, line, message = match.groups()
        kind = "warning_kind" if warning.match(message) else "error_kind"
        errors.append(dict(file=os.path.abspath(file), line=int(line), 
                           kind=kind, message=message))
    
if not errors: sys.exit(0)

# AppleScript expression for a single entry in the BBEdit brower.
template = u"""
    {result_kind: %(kind)s, ¬
     result_file: "%(file)s", result_line: %(line)d, ¬
     message: "%(message)s"}"""

# Generate the full AppleScript.
script = (u"""tell application "BBEdit"
  set error_list to { ¬"""+
  u", ¬".join(template % error for error in errors)+
  u""" ¬
  }
  make new results browser with data error_list ¬
    with properties {name:"Errors"}
end tell""")

# osascript insists on printing out the value of the last AppleScript statement.
script += '''\n"Opened BBEdit browser."'''

os.execl("/usr/bin/osascript", "osascript", "-e", script)