bash fmt
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mmdbalkhi
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tools/bash_fmt.py
Executable file
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tools/bash_fmt.py
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# **************************************************************************
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# Copyright (C) 2011, Paul Lutus *
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# *
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# This program is free software; you can redistribute it and/or modify *
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# it under the terms of the GNU General Public License as published by *
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# the Free Software Foundation; either version 2 of the License, or *
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# (at your option) any later version. *
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# *
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# This program is distributed in the hope that it will be useful, *
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# but WITHOUT ANY WARRANTY; without even the implied warranty of *
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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# GNU General Public License for more details. *
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# *
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# You should have received a copy of the GNU General Public License *
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# along with this program; if not, write to the *
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# Free Software Foundation, Inc., *
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# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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# **************************************************************************
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import re
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import sys
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PVERSION = "1.0"
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class BeautifyBash:
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def __init__(self):
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self.tab_str = " "
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self.tab_size = 2
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def read_file(self, fp):
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with open(fp) as f:
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return f.read()
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def write_file(self, fp, data):
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with open(fp, "w") as f:
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f.write(data)
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def beautify_string(self, data, path=""):
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tab = 0
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case_stack = []
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in_here_doc = False
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defer_ext_quote = False
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in_ext_quote = False
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ext_quote_string = ""
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here_string = ""
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output = []
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line = 1
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for record in re.split("\n", data):
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record = record.rstrip()
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stripped_record = record.strip()
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# collapse multiple quotes between ' ... '
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test_record = re.sub(r"\'.*?\'", "", stripped_record)
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# collapse multiple quotes between " ... "
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test_record = re.sub(r'".*?"', "", test_record)
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# collapse multiple quotes between ` ... `
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test_record = re.sub(r"`.*?`", "", test_record)
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# collapse multiple quotes between \` ... ' (weird case)
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test_record = re.sub(r"\\`.*?\'", "", test_record)
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# strip out any escaped single characters
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test_record = re.sub(r"\\.", "", test_record)
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# remove '#' comments
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test_record = re.sub(r"(\A|\s)(#.*)", "", test_record, 1)
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if not in_here_doc:
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if re.search("<<-?", test_record):
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here_string = re.sub(
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".*<<-?\s*['|\"]?([_|\w]+)['|\"]?.*", "\\1", stripped_record, 1
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)
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in_here_doc = len(here_string) > 0
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if in_here_doc: # pass on with no changes
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output.append(record)
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# now test for here-doc termination string
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if re.search(here_string, test_record) and not re.search(
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"<<", test_record
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):
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in_here_doc = False
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else: # not in here doc
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if in_ext_quote:
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if re.search(ext_quote_string, test_record):
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# provide line after quotes
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test_record = re.sub(
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".*%s(.*)" % ext_quote_string, "\\1", test_record, 1
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)
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in_ext_quote = False
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else: # not in ext quote
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if re.search(r'(\A|\s)(\'|")', test_record):
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# apply only after this line has been processed
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defer_ext_quote = True
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ext_quote_string = re.sub(".*(['\"]).*", "\\1", test_record, 1)
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# provide line before quote
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test_record = re.sub(
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"(.*)%s.*" % ext_quote_string, "\\1", test_record, 1
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)
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if in_ext_quote:
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# pass on unchanged
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output.append(record)
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else: # not in ext quote
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inc = len(
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re.findall("(\s|\A|;)(case|then|do)(;|\Z|\s)", test_record)
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)
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inc += len(re.findall("(\{|\(|\[)", test_record))
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outc = len(
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re.findall(
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"(\s|\A|;)(esac|fi|done|elif)(;|\)|\||\Z|\s)", test_record
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)
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)
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outc += len(re.findall("(\}|\)|\])", test_record))
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if re.search(r"\besac\b", test_record):
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if len(case_stack) == 0:
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sys.stderr.write(
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'File %s: error: "esac" before "case" in line %d.\n'
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% (path, line)
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)
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else:
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outc += case_stack.pop()
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# sepcial handling for bad syntax within case ... esac
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if len(case_stack) > 0:
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if re.search("\A[^(]*\)", test_record):
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# avoid overcount
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outc -= 2
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case_stack[-1] += 1
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if re.search(";;", test_record):
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outc += 1
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case_stack[-1] -= 1
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# an ad-hoc solution for the "else" keyword
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else_case = (0, -1)[re.search("^(else)", test_record) != None]
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net = inc - outc
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tab += min(net, 0)
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extab = tab + else_case
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extab = max(0, extab)
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output.append(
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(self.tab_str * self.tab_size * extab) + stripped_record
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)
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tab += max(net, 0)
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if defer_ext_quote:
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in_ext_quote = True
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defer_ext_quote = False
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if re.search(r"\bcase\b", test_record):
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case_stack.append(0)
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line += 1
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error = tab != 0
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if error:
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sys.stderr.write(
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"File %s: error: indent/outdent mismatch: %d.\n" % (path, tab)
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)
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return "\n".join(output), error
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def beautify_file(self, path):
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error = False
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if path == "-":
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data = sys.stdin.read()
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result, error = self.beautify_string(data, "(stdin)")
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sys.stdout.write(result)
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else: # named file
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data = self.read_file(path)
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result, error = self.beautify_string(data, path)
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if data != result:
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# make a backup copy
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self.write_file(path + "~", data)
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self.write_file(path, result)
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return error
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def main(self):
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error = False
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sys.argv.pop(0)
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if len(sys.argv) < 1:
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sys.stderr.write('usage: shell script filenames or "-" for stdin.\n')
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else:
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for path in sys.argv:
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error |= self.beautify_file(path)
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sys.exit((0, 1)[error])
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# if not called as a module
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if __name__ == "__main__":
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BeautifyBash().main()
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