check-code: Only call check-code if __name__ = "__main__".

This changeset moves the code that actually executes something to the
"if __name__ = '__main__'" section to allow the file to be imported as
a module.

contrib/check-code.py

@@ -1,169 +1,170 b''
 #!/usr/bin/env python
 #
 # check-code - a style and portability checker for Mercurial
 #
 # Copyright 2010 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 import sys, re, glob
 
 def repquote(m):
     t = re.sub(r"\w", "x", m.group(2))
     t = re.sub(r"[^\sx]", "o", t)
     return m.group(1) + t + m.group(1)
 
 def repcomment(m):
     return m.group(1) + "#" * len(m.group(2))
 
 def repccomment(m):
     t = re.sub(r"((?<=\n) )|\S", "x", m.group(2))
     return m.group(1) + t + "*/"
 
 def repcallspaces(m):
     t = re.sub(r"\n\s+", "\n", m.group(2))
     return m.group(1) + t
 
 def repinclude(m):
     return m.group(1) + "<foo>"
 
 def rephere(m):
     t = re.sub(r"\S", "x", m.group(2))
     return m.group(1) + t
 
 
 testpats = [
     (r'(pushd|popd)', "don't use 'pushd' or 'popd', use 'cd'"),
     (r'\W\$?\(\([^\)]*\)\)', "don't use (()) or $(()), use 'expr'"),
     (r'^function', "don't use 'function', use old style"),
     (r'grep.*-q', "don't use 'grep -q', redirect to /dev/null"),
     (r'echo.*\\n', "don't use 'echo \\n', use printf"),
     (r'^diff.*-\w*N', "don't use 'diff -N'"),
     (r'(^| )wc[^|]*$', "filter wc output"),
     (r'head -c', "don't use 'head -c', use 'dd'"),
     (r'ls.*-\w*R', "don't use 'ls -R', use 'find'"),
     (r'printf.*\\\d\d\d', "don't use 'printf \NNN', use Python"),
     (r'printf.*\\x', "don't use printf \\x, use Python"),
     (r'\$\(.*\)', "don't use $(expr), use `expr`"),
     (r'rm -rf \*', "don't use naked rm -rf, target a directory"),
     (r'(^|\|\s*)grep (-\w\s+)*[^|]*[(|]\w',
      "use egrep for extended grep syntax"),
     (r'/bin/', "don't use explicit paths for tools"),
     (r'\$PWD', "don't use $PWD, use `pwd`"),
     (r'[^\n]\Z', "no trailing newline"),
     (r'export.*=', "don't export and assign at once"),
 ]
 
 testfilters = [
     (r"( *)(#([^\n]*\S)?)", repcomment),
     (r"<<(\S+)((.|\n)*?\n\1)", rephere),
 ]
 
 pypats = [
     (r'^\s*\t', "don't use tabs"),
     (r'\S;\s*\n', "semicolon"),
     (r'\w,\w', "missing whitespace after ,"),
     (r'\w[+/*\-<>]\w', "missing whitespace in expression"),
     (r'^\s+\w+=\w+[^,)]$', "missing whitespace in assignment"),
     (r'.{85}', "line too long"),
     (r'[^\n]\Z', "no trailing newline"),
 #    (r'^\s+[^_ ][^_. ]+_[^_]+\s*=', "don't use underbars in identifiers"),
 #    (r'\w*[a-z][A-Z]\w*\s*=', "don't use camelcase in identifiers"),
     (r'^\s*(if|while|def|class|except|try)\s[^[]*:\s*[^\]#\s]+',
      "linebreak after :"),
     (r'class\s[^(]:', "old-style class, use class foo(object)"),
     (r'^\s+del\(', "del isn't a function"),
     (r'^\s+except\(', "except isn't a function"),
     (r',]', "unneeded trailing ',' in list"),
 #    (r'class\s[A-Z][^\(]*\((?!Exception)',
 #     "don't capitalize non-exception classes"),
 #    (r'in range\(', "use xrange"),
 #    (r'^\s*print\s+', "avoid using print in core and extensions"),
     (r'[\x80-\xff]', "non-ASCII character literal"),
     (r'("\')\.format\(', "str.format() not available in Python 2.4"),
     (r'^\s*with\s+', "with not available in Python 2.4"),
     (r'^\s*(any|all)\(', "any/all not available in Python 2.4"),
     (r'if\s.*\selse', "if ... else form not available in Python 2.4"),
     (r'([\(\[]\s\S)|(\S\s[\)\]])', "gratuitous whitespace in () or []"),
 #    (r'\s\s=', "gratuitous whitespace before ="),
     (r'[^>< ](\+=|-=|!=|<>|<=|>=|<<=|>>=)\S', "missing whitespace around operator"),
     (r'[^>< ](\+=|-=|!=|<>|<=|>=|<<=|>>=)\s', "missing whitespace around operator"),
     (r'\s(\+=|-=|!=|<>|<=|>=|<<=|>>=)\S', "missing whitespace around operator"),
     (r'[^+=*!<>&| -](\s=|=\s)[^= ]', "wrong whitespace around ="),
     (r'raise Exception', "don't raise generic exceptions"),
     (r'ui\.(status|progress|write|note)\([\'\"]x', "unwrapped ui message"),
 ]
 
 pyfilters = [
     (r'''(?<!")(")(([^"\n]|\\")+)"(?!")''', repquote),
     (r"""(?<!')(')(([^'\n]|\\')+)'(?!')""", repquote),
     (r"""(''')(([^']|\\'|'{1,2}(?!'))*)'''""", repquote),
     (r'''(""")(([^"]|\\"|"{1,2}(?!"))*)"""''', repquote),
     (r"( *)(#([^\n]*\S)?)", repcomment),
 ]
 
 cpats = [
     (r'//', "don't use //-style comments"),
     (r'^  ', "don't use spaces to indent"),
     (r'\S\t', "don't use tabs except for indent"),
     (r'(\S\s+|^\s+)\n', "trailing whitespace"),
     (r'.{85}', "line too long"),
     (r'(while|if|do|for)\(', "use space after while/if/do/for"),
     (r'return\(', "return is not a function"),
     (r' ;', "no space before ;"),
     (r'\w+\* \w+', "use int *foo, not int* foo"),
     (r'\([^\)]+\) \w+', "use (int)foo, not (int) foo"),
     (r'\S+ (\+\+|--)', "use foo++, not foo ++"),
     (r'\w,\w', "missing whitespace after ,"),
     (r'\w[+/*]\w', "missing whitespace in expression"),
     (r'^#\s+\w', "use #foo, not # foo"),
     (r'[^\n]\Z', "no trailing newline"),
 ]
 
 cfilters = [
     (r'(/\*)(((\*(?!/))|[^*])*)\*/', repccomment),
     (r'''(?<!")(")(([^"]|\\")+"(?!"))''', repquote),
     (r'''(#\s*include\s+<)([^>]+)>''', repinclude),
     (r'(\()([^)]+\))', repcallspaces),
 ]
 
 checks = [
     ('python', r'.*\.(py|cgi)$', pyfilters, pypats),
     ('test script', r'(.*/)?test-[^.~]*$', testfilters, testpats),
     ('c', r'.*\.c$', cfilters, cpats),
 ]
 
-if len(sys.argv) == 1:
-    check = glob.glob("*")
-else:
-    check = sys.argv[1:]
+if __name__ == "__main__":
+    if len(sys.argv) == 1:
+        check = glob.glob("*")
+    else:
+        check = sys.argv[1:]
 
-for f in check:
-    for name, match, filters, pats in checks:
-        fc = 0
-        if not re.match(match, f):
-            continue
-        pre = post = open(f).read()
-        if "no-" + "check-code" in pre:
+    for f in check:
+        for name, match, filters, pats in checks:
+            fc = 0
+            if not re.match(match, f):
+                continue
+            pre = post = open(f).read()
+            if "no-" + "check-code" in pre:
+                break
+            for p, r in filters:
+                post = re.sub(p, r, post)
+            # print post # uncomment to show filtered version
+            z = enumerate(zip(pre.splitlines(), post.splitlines(True)))
+            for n, l in z:
+                if "check-code" + "-ignore" in l[0]:
+                    continue
+                lc = 0
+                for p, msg in pats:
+                    if re.search(p, l[1]):
+                        if not lc:
+                            print "%s:%d:" % (f, n + 1)
+                            print " > %s" % l[0]
+                        print " %s" % msg
+                        lc += 1
+                        fc += 1
+                if fc == 15:
+                    print " (too many errors, giving up)"
+                    break
             break
-        for p, r in filters:
-            post = re.sub(p, r, post)
-        # print post # uncomment to show filtered version
-        z = enumerate(zip(pre.splitlines(), post.splitlines(True)))
-        for n, l in z:
-            if "check-code" + "-ignore" in l[0]:
-                continue
-            lc = 0
-            for p, msg in pats:
-                if re.search(p, l[1]):
-                    if not lc:
-                        print "%s:%d:" % (f, n + 1)
-                        print " > %s" % l[0]
-                    print " %s" % msg
-                    lc += 1
-                    fc += 1
-            if fc == 15:
-                print " (too many errors, giving up)"
-                break
-        break