This commit adds a lexer for linux kernel logs as outputted by `dmesg`

It supports output from `dmesg`, in that case it highlights based on
keywords in the line

It can also highlight `dmesg -x` output. In that case it uses the
loglevels from the kernel to highlight the lines.

1 files changed, 59 insertions, 0 deletions

diff --git a/pygments/lexers/log.py b/pygments/lexers/log.py
new file mode 100644
index 00000000..4f651bf2
--- /dev/null
+++ b/pygments/lexers/log.py
@@ -0,0 +1,59 @@
+# -*- coding: utf-8 -*-
+"""
+    pygments.lexers.log
+    ~~~~~~~~~~~~~~~~~~~~~
+
+    Lexers for various log file formats.
+
+    :copyright: Copyright 2006-2019 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, include
+from pygments.token import *
+
+__all__ = ['KernelLogLexer']
+
+
+class KernelLogLexer(RegexLexer):
+    name = 'Kernel log'
+    aliases = ['kmsg', 'dmesg']
+    filenames = ['*.kmsg', '*.dmesg']
+
+    tokens = {
+        'root': [
+            (r'^(?=\[)', Text, 'unknown'),
+            (r'^([^:]+):debug\s*: (?=\[)', Text, 'debug'),
+            (r'^([^:]+):info\s*: (?=\[)', Text, 'info'),
+            (r'^([^:]+):warn\s*: (?=\[)', Text, 'warn'),
+            (r'^([^:]+):notice\s*: (?=\[)', Text, 'warn'),
+            (r'^([^:]+):err\s*: (?=\[)', Text, 'error'),
+            (r'^([^:]+):crit\s*: (?=\[)', Text, 'error'),
+        ],
+        'unknown': [
+            (r'^(?=.+(warning|notice|audit|deprecated))', Text, 'warn'),
+            (r'^(?=.+(error|critical|fail|Bug))', Text, 'error'),
+            (r'', Text, 'info'),
+        ],
+        'base': [
+            (r'\[[0-9\. ]+\] ', Number),
+            (r'(?<=\] ).+?:', Keyword),
+            (r'\n', Text, '#pop'),
+        ],
+        'debug': [
+            include('base'),
+            (r'.+\n', Text, '#pop')
+        ],
+        'info': [
+            include('base'),
+            (r'.+\n', Text, '#pop')
+        ],
+        'warn': [
+            include('base'),
+            (r'.+', Comment, '#pop')
+        ],
+        'error': [
+            include('base'),
+            (r'.+\n', Generic.Error, '#pop')
+        ]
+    }