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+# pre-commit
+
+This program is a git pre-commit hook that runs an arbitrary set of
+syntax, style, and complexity checks against files about to be checked
+in.
+
+pre-commit is a git-hook; you install it into your project's .git
+directory in .git/hooks and make it executable.  It will run every time
+you attempt to commit a collection of files, running the configured list
+of linters against those files, and will terminate the check-in if any
+of the files fails.
+
+pre-commit uses the git-stash to temporarily store any changes you may
+have made between your "git-add" and your "git-commit"; it therefore
+checks against your *staged* files, not your *workspace* files.  Most
+hooks do the wrong thing and assume your stage and workspace are the
+same.  This is not necessarily so.
+
+pre-commit is written in Hy, a Lisp-like dialect of Python.  I find Hy's
+support for "cond", complex anonymous functions, and complex return
+values highly appealing.  The UTF-8 handling in this script means it is
+compatible only with Hy running atop Python3.
+
+pre-commit is based on the pre-commit recommendations in Steve Pulec's
+"Why you need a git-hook and why most are wrong" available at:
+http://css.dzone.com/articles/why-your-need-git-pre-commit The changes
+I've made reflect a different set of needs, different possible ways of
+receiving error conditions, and a slightly nicer output.
+
+If, while installing this, you encounter a problem, you must return your
+git repository to its original pre-stash state.  Learn to use the
+following commands correctly:
+
+git stash list
+git stash pop
+
diff --git a/pre-commit b/pre-commit
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+#!/usr/bin/env hy
+
+(def *version* "0.0.2")
+(import os re subprocess sys)
+
+; pccs (pre-commit configs) should be a directory under your .git
+; where you store the RCs for your various linters.  If you want to
+; use a global one, you'll have to edit the configuration entries
+; below.
+
+(def *config-path* (os.path.join (.get os.environ "GIT_DIR" "./.git") "pccs"))
+(def *modified* (.compile re "^[MA]\s+(?P<name>.*)$"))
+
+(def *checks* 
+  [
+;   {
+;    "output" "Checking for debugger commands in Javascript..."
+;    "command" "grep -n debugger {filename}"
+;    "match_files" [".*\.js$"]
+;    "print_filename" True
+;    "error_condition" "output"
+;    }
+   {
+    "output" "Running Jshint..."
+    "command" "jshint -c {config_path}/jshint.rc {filename}"
+    "match_files" [".*\.js$"]
+    "print_filename" False
+    "error_condition" "error"
+    }
+   {
+    "output" "Running Coffeelint..."
+    "command" "coffeelint {filename}"
+    "match_files" [".*\.coffee$"]
+    "print_filename" False
+    "error_condition" "error"
+    }
+   {
+    "output" "Running JSCS..."
+    "command" "jscs -c {config_path}/jscs.rc {filename}"
+    "match_files" [".*\.js$"]
+    "print_filename" False
+    "error_condition" "error"
+    }
+   {
+    "output" "Running pep8..."
+    "command" "pep8 -r --ignore=E501,W293,W391 {filename}"
+    "match_files" [".*\.py$"]
+    "print_filename" False
+    "error_condition" "error"
+    }
+   {
+    "output" "Running xmllint..."
+    "command" "xmllint {filename}"
+    "match_files" [".*\.xml"]
+    "print_filename" False
+    "error_condition" "error"
+    }
+   ]
+  )
+
+(defn get-git [cmd]
+  (let [[fullcmd (+ ["git"] cmd)]
+        [process (subprocess.Popen fullcmd 
+                                   :stdout subprocess.PIPE 
+                                   :stderr subprocess.PIPE)]
+        [(, out err) (.communicate process)]]
+    (, out err process.returncode)))
+
+(defn call-git [cmd]
+  (let [[fullcmd (+ ["git"] cmd)]]
+    (subprocess.call fullcmd 
+                     :stdout subprocess.PIPE 
+                     :stderr subprocess.PIPE)))
+
+(defn get-cmd [cmd]
+  (let [[process (subprocess.Popen cmd 
+                                   :stdout subprocess.PIPE 
+                                   :stderr subprocess.PIPE 
+                                   :shell True)]
+        [(, out err) (.communicate process)]]
+    (, out err process.returncode)))
+
+(defn max-code [code-pairs]
+  (reduce (fn [m i] (if 
+                        (> (abs (get i 0)) (abs m)) 
+                      (get i 0) 
+                      m)) 
+          code-pairs 0))
+  
+(defn message-bodies [code-pairs]
+  (lmap (fn [i] (get i 1)) code-pairs))
+
+(defn matches-file [filename match-files]
+  (any (map (fn [match-file] (-> (.compile re match-file) 
+                                 (.match filename))) 
+            match-files)))
+
+; Hy is overeager to return an iterators which is consumed during
+; later traversal.  lmap returns a concrete list instead.
+
+(defn lmap (pred iter) (list (map pred iter)))
+
+(defn run-external-checker [filename check]
+  (let [[cmd (-> (get check "command") (.format 
+                                        :filename filename 
+                                        :config_path *config-path*))]
+        [(, out err returncode) (get-cmd cmd)]]
+    (if (or (and out (= (.get check "error_condition" "error") "output")) 
+            err 
+            (not (= returncode 0)))
+      (let [[prefix (if (get check "print_filename") 
+                      (.format "\t{}:" filename) 
+                      "\t")]
+            [output (+ 
+                     (lmap (fn [line] (.format "{}{}" prefix (.decode line "utf-8"))) 
+                           (.splitlines out))
+                     (if err [err] []))]]
+        [(or returncode 1) output])
+      [0 []])))
+
+(defn check-file [filename check]
+  (cond [(and (in "match_files" check) 
+              (not (matches-file filename (get check "match_files")))) [0 []] ]
+        [(and (in "ignore_files" check) 
+              (matches-file filename (get check "ignore_files"))) [0 []] ]
+        [true (run-external-checker filename check)]))
+
+(defn check-files [filenames check]
+  (let [[scan-results (lmap 
+                       (fn [filename] (check-file filename check)) filenames)]
+        [messages (+ [(get check "output")] (message-bodies scan-results))]]
+    [(max-code scan-results) messages]))
+
+(defn get-all-files []
+  (let [[build-filenames 
+         (fn [filenames] 
+           (map 
+            (fn [f] (os.path.join (get filenames 0) f)) (get filenames 2)))]]
+    (flatten (list-comp (build-filenames o) [o (.walk os ".")]))))
+
+; I removed the originally recommended "-u" command from stash; it was
+; "cleaning up" far too zealously, deleting my node_modules directory
+
+(defn get-some-files [against]
+  (let [[(, out err returncode) 
+         (get-git ["diff-index" "--name-status" against])]
+        [lines (.splitlines out)]
+        [matcher (fn [line] (.match *modified* (.decode line "utf-8")))]]
+    (filter 
+     (fn [x] (not (= x "")))
+     (list-comp (.group match "name") [match (map matcher lines)] match))))
+
+(defn scan [all-files against]
+  (do 
+    (call-git ["stash" "--keep-index"])
+    (let [[toscan 
+           (list (if all-files (get-all-files) (get-some-files against)))]
+          [check-results 
+           (lmap (fn [check] (check-files toscan check)) *checks*)]
+          [exit-code (max-code check-results)]
+          [messages (flatten (message-bodies check-results))]]
+      (do
+        (for [line messages] (print line))
+        (call-git ["reset" "--hard"])
+        (call-git ["stash" "pop" "--quiet" "--index"])
+        exit-code))))
+
+; That magic number below is what git requires when the repository is
+; completely empty.
+
+(defn get-head-tag []
+  (let [[(, out err returncode) (get-git ["rev-parse" "--verify HEAD"])]]
+    (if err "4b825dc642cb6eb9a060e54bf8d69288fbee4904" "HEAD")))
+
+(defmain [&rest args]
+  (sys.exit 
+   (scan 
+    (and (> (len args) 1) 
+         (= (get args 2) "--all-files")) 
+    (get-head-tag))))
diff --git a/pre-commit.py b/pre-commit.py
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index 0000000..4e20b60
--- /dev/null
+++ b/pre-commit.py
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+from hy.core.language import filter, flatten, is_integer, map, reduce
+VERSION = '0.0.2'
+import os
+import re
+import subprocess
+import sys
+CONFIG_PATH = os.path.join(os.environ.get('GIT_DIR', './.git'), 'pccs')
+MODIFIED = re.compile('^[MA]\\s+(?P<name>.*)$')
+CHECKS = [{'output': 'Running Jshint...', 'command': 'jshint -c {config_path}/jshint.rc {filename}', 'match_files': ['.*\\.js$'], 'print_filename': False, 'error_condition': 'error', }, {'output': 'Running Coffeelint...', 'command': 'coffeelint {filename}', 'match_files': ['.*\\.coffee$'], 'print_filename': False, 'error_condition': 'error', }, {'output': 'Running JSCS...', 'command': 'jscs -c {config_path}/jscs.rc {filename}', 'match_files': ['.*\\.js$'], 'print_filename': False, 'error_condition': 'error', }, {'output': 'Running pep8...', 'command': 'pep8 -r --ignore=E501,W293,W391 {filename}', 'match_files': ['.*\\.py$'], 'print_filename': False, 'error_condition': 'error', }, {'output': 'Running xmllint...', 'command': 'xmllint {filename}', 'match_files': ['.*\\.xml'], 'print_filename': False, 'error_condition': 'error', }]
+
+def get_git(cmd):
+
+    def _hy_anon_fn_1():
+        fullcmd = (['git'] + cmd)
+        process = subprocess.Popen(fullcmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        (out, err) = process.communicate()
+        (out, err)
+        return (out, err, process.returncode)
+    return _hy_anon_fn_1()
+
+def call_git(cmd):
+
+    def _hy_anon_fn_3():
+        fullcmd = (['git'] + cmd)
+        return subprocess.call(fullcmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    return _hy_anon_fn_3()
+
+def get_cmd(cmd):
+
+    def _hy_anon_fn_5():
+        process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+        (out, err) = process.communicate()
+        (out, err)
+        return (out, err, process.returncode)
+    return _hy_anon_fn_5()
+
+def max_code(code_pairs):
+
+    def _hy_anon_fn_7(m, i):
+        return (i[0] if (abs(i[0]) > abs(m)) else m)
+    return reduce(_hy_anon_fn_7, code_pairs, 0)
+
+def message_bodies(code_pairs):
+
+    def _hy_anon_fn_9(i):
+        return i[1]
+    return lmap(_hy_anon_fn_9, code_pairs)
+
+def matches_file(filename, match_files):
+
+    def _hy_anon_fn_11(match_file):
+        return re.compile(match_file).match(filename)
+    return any(map(_hy_anon_fn_11, match_files))
+
+def lmap(pred, iter):
+    return list(map(pred, iter))
+
+def run_external_checker(filename, check):
+
+    def _hy_anon_fn_16():
+        cmd = check['command'].format(filename=filename, config_path=CONFIG_PATH)
+        (out, err, returncode) = get_cmd(cmd)
+        (out, err, returncode)
+        if ((out and (check.get('error_condition', 'error') == 'output')) or err or (not (returncode == 0))):
+
+            def _hy_anon_fn_15():
+                prefix = ('\t{}:'.format(filename) if check['print_filename'] else '\t')
+
+                def _hy_anon_fn_14(line):
+                    return '{}{}'.format(prefix, line.decode('utf-8'))
+                output = (lmap(_hy_anon_fn_14, out.splitlines()) + ([err] if err else []))
+                return [(returncode or 1), output]
+            _hy_anon_var_1 = _hy_anon_fn_15()
+        else:
+            _hy_anon_var_1 = [0, []]
+        return _hy_anon_var_1
+    return _hy_anon_fn_16()
+
+def check_file(filename, check):
+    return ([0, []] if (('match_files' in check) and (not matches_file(filename, check['match_files']))) else ([0, []] if (('ignore_files' in check) and matches_file(filename, check['ignore_files'])) else (run_external_checker(filename, check) if True else None)))
+
+def check_files(filenames, check):
+
+    def _hy_anon_fn_20():
+
+        def _hy_anon_fn_19(filename):
+            return check_file(filename, check)
+        scan_results = lmap(_hy_anon_fn_19, filenames)
+        messages = ([check['output']] + message_bodies(scan_results))
+        return [max_code(scan_results), messages]
+    return _hy_anon_fn_20()
+
+def get_all_files():
+
+    def _hy_anon_fn_24():
+
+        def build_filenames(filenames):
+
+            def _hy_anon_fn_22(f):
+                return os.path.join(filenames[0], f)
+            return map(_hy_anon_fn_22, filenames[2])
+        return flatten([build_filenames(o) for o in os.walk('.')])
+    return _hy_anon_fn_24()
+
+def get_some_files(against):
+
+    def _hy_anon_fn_28():
+        (out, err, returncode) = get_git(['diff-index', '--name-status', against])
+        (out, err, returncode)
+        lines = out.splitlines()
+
+        def matcher(line):
+            return MODIFIED.match(line.decode('utf-8'))
+
+        def _hy_anon_fn_27(x):
+            return (not (x == ''))
+        return filter(_hy_anon_fn_27, [match.group('name') for match in map(matcher, lines) if match])
+    return _hy_anon_fn_28()
+
+def scan(all_files, against):
+    call_git(['stash', '--keep-index'])
+
+    def _hy_anon_fn_31():
+        toscan = list((get_all_files() if all_files else get_some_files(against)))
+
+        def _hy_anon_fn_30(check):
+            return check_files(toscan, check)
+        check_results = lmap(_hy_anon_fn_30, CHECKS)
+        exit_code = max_code(check_results)
+        messages = flatten(message_bodies(check_results))
+        for line in messages:
+            print(line)
+        call_git(['reset', '--hard'])
+        call_git(['stash', 'pop', '--quiet', '--index'])
+        return exit_code
+    return _hy_anon_fn_31()
+
+def get_head_tag():
+
+    def _hy_anon_fn_33():
+        (out, err, returncode) = get_git(['rev-parse', '--verify HEAD'])
+        (out, err, returncode)
+        return ('4b825dc642cb6eb9a060e54bf8d69288fbee4904' if err else 'HEAD')
+    return _hy_anon_fn_33()
+
+def main(*args):
+    return sys.exit(scan(((len(args) > 1) and (args[2] == '--all-files')), get_head_tag()))
+if (__name__ == '__main__'):
+    import sys
+    :G_1235 = main(*sys.argv)
+    _hy_anon_var_2 = (sys.exit(:G_1235) if is_integer(:G_1235) else None)
+else:
+    _hy_anon_var_2 = None