ajout de tailor.py: affichage d'un fichier en mettant en surbrillance certains patterns

2017-04-12 06:14:09 +04:00 · 2017-04-12 06:14:09 +04:00 · 4593ad8f8e
commit 4593ad8f8e
parent 8e5ad225f1
1 changed files with 119 additions and 0 deletions
--- a/tailor.py
+++ b/tailor.py
@ -0,0 +1,119 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 mode: python -*- vim:sw=4:sts=4:et:ai:si:sta:fenc=utf-8
+
+u"""Afficher des lignes en mettant en surbrillance certains patterns"""
+
+import sys, subprocess, re
+from collections import OrderedDict
+
+def bluef(line, *ignored): return '\x1B[34m%s\x1B[0m' % line
+def greenf(line, *ignored): return '\x1B[32m%s\x1B[0m' % line
+def yellowf(line, *ignored): return '\x1B[33m%s\x1B[0m' % line
+def redf(line, *ignored): return '\x1B[31m%s\x1B[0m' % line
+def nonef(line, *ignored): return re.sub('\x1B\[.*?m', '', line)
+
+DEFAULT_PATTERNS = OrderedDict([
+    (r'(?i)error', redf),
+    (r'(?i)warn(ing)?', yellowf),
+    (r'(?i)info', bluef),
+    (None, nonef),
+])
+FORMATS = OrderedDict([
+    ('blue', bluef),
+    ('green', greenf),
+    ('yellow', yellowf),
+    ('red', redf),
+    ('none', nonef),
+])
+FORMAT_ALIASES = {
+    'b': 'blue',
+    'g': 'green',
+    'y': 'yellow',
+    'r': 'red',
+    '': 'none',
+}
+
+def strip_nl(s):
+    if s is None: return None
+    elif s.endswith("\r\n"): s = s[:-2]
+    elif s.endswith("\n"): s = s[:-1]
+    elif s.endswith("\r"): s = s[:-1]
+    return s
+
+def run_tailor(inputfile=None, patterns=None):
+    if inputfile is None:
+        def next_line():
+            while True:
+                try: line = sys.stdin.readline()
+                except: break
+                if line == '': break
+                yield line
+    else:
+        def next_line():
+            p = subprocess.Popen(
+                ['tail', '-f', inputfile],
+                stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+            while True:
+                try: line = p.stdout.readline()
+                except: break
+                if line == '': break
+                yield line
+    if patterns is None: patterns = DEFAULT_PATTERNS
+
+    for line in next_line():
+        line = nonef(strip_nl(line))
+        func = False
+        mo = None
+        for p, f in patterns.items():
+            if p is None:
+                func = f
+                mo = None
+                break
+            mo = re.search(p, line)
+            if mo is not None:
+                func = f
+                break
+        if func is not False:
+            line = func(line, mo)
+            sys.stdout.write(line)
+            sys.stdout.write('\n')
+
+if __name__ == '__main__':
+    from argparse import ArgumentParser, RawTextHelpFormatter
+    AP = ArgumentParser(
+        formatter_class=RawTextHelpFormatter,
+        usage=u"%(prog)s [-f INPUTFILE]",
+        description=__doc__,
+    )
+    AP.set_defaults(inputfile=None, patterns=None, defaults=True)
+    AP.add_argument('-f', '--follow', dest='inputfile',
+                    help=u"Spécifier un fichier dont il faut suivre le contenu")
+    AP.add_argument('-e', '--pattern', action='append', dest='patterns', metavar='PATTERN:FORMAT',
+                    help=u"""\
+Ajouter une spécification de pattern et le format dans lequel il doit être affiché
+Les formats valides sont: %s
+Le format par défaut est red""" % ', '.join(FORMATS.keys()))
+    AP.add_argument('-z', '--no-defaults', action='store_const', dest='defaults', const=False,
+                    help=u"Ne pas ajouter les patterns par défaut")
+    o = AP.parse_args()
+
+    if o.patterns is None:
+        patterns = DEFAULT_PATTERNS
+    else:
+        patterns = OrderedDict()
+        for pf in o.patterns:
+            mo = re.match('(.*):([a-zA-Z]*)$', pf)
+            if mo is not None:
+                p = mo.group(1)
+                of = mo.group(2)
+            else:
+                p = pf
+                of = 'red'
+            f = of.lower()
+            f = FORMAT_ALIASES.get(f, f)
+            if f not in FORMATS:
+                raise ValueError("%s: format invalide" % of)
+            patterns[p] = FORMATS[f]
+        if o.defaults: patterns.update(DEFAULT_PATTERNS)
+
+    run_tailor(o.inputfile, patterns)