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.

2 files changed, 60 insertions, 0 deletions

diff --git a/pygments/lexers/_mapping.py b/pygments/lexers/_mapping.py
index 1ed7140d..8a09ea2b 100644
--- a/pygments/lexers/_mapping.py
+++ b/pygments/lexers/_mapping.py
@@ -233,6 +233,7 @@ LEXERS = {
     'JuttleLexer': ('pygments.lexers.javascript', 'Juttle', ('juttle', 'juttle'), ('*.juttle',), ('application/juttle', 'application/x-juttle', 'text/x-juttle', 'text/juttle')),
     'KalLexer': ('pygments.lexers.javascript', 'Kal', ('kal',), ('*.kal',), ('text/kal', 'application/kal')),
     'KconfigLexer': ('pygments.lexers.configs', 'Kconfig', ('kconfig', 'menuconfig', 'linux-config', 'kernel-config'), ('Kconfig', '*Config.in*', 'external.in*', 'standard-modules.in'), ('text/x-kconfig',)),
+    'KernelLogLexer': ('pygments.lexers.log', 'Kernel log', ('kmsg', 'dmesg'), ('*.kmsg', '*.dmesg'), ()),
     'KokaLexer': ('pygments.lexers.haskell', 'Koka', ('koka',), ('*.kk', '*.kki'), ('text/x-koka',)),
     'KotlinLexer': ('pygments.lexers.jvm', 'Kotlin', ('kotlin',), ('*.kt',), ('text/x-kotlin',)),
     'LSLLexer': ('pygments.lexers.scripting', 'LSL', ('lsl',), ('*.lsl',), ('text/x-lsl',)),
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')
+        ]
+    }