replace Syslog dependency with a custom syntax

.gitmodules

@@ -97,10 +97,6 @@
 [submodule "assets/syntaxes/Assembly (ARM)"]
 	path = assets/syntaxes/02_Extra/Assembly (ARM)
 	url = https://github.com/tvi/Sublime-ARM-Assembly
-[submodule "assets/syntaxes/syslog-syntax"]
-	path = assets/syntaxes/02_Extra/Syslog
-	url = https://github.com/caos21/syslog-syntax.git
-	branch = master
 [submodule "assets/syntaxes/protobuf-syntax-highlighting"]
 	path = assets/syntaxes/02_Extra/Protobuf
 	url = https://github.com/VcamX/protobuf-syntax-highlighting.git

CHANGELOG.md

@@ -12,6 +12,8 @@
 
 ## Syntaxes
 
+- Improved the Syslog syntax highlighting, see #1606 (@keith-hall)
+
 ## New themes
 
 ## `bat` as a library

assets/syntaxes/02_Extra/Syslog

@@ -1 +0,0 @@
-Subproject commit 7628d4e0b89d3b4f0dcc014bfb4a3e3433f5133a

assets/syntaxes/02_Extra/syslog.sublime-syntax

@@ -0,0 +1,70 @@
+%YAML 1.2
+---
+# http://www.sublimetext.com/docs/3/syntax.html
+name: syslog
+file_extensions:
+  - syslog
+scope: text.syslog
+contexts:
+  main:
+    - match: '^\w+\s+\d+\s+\d{2}:\d{2}:\d{2}'
+      scope: meta.datetime.syslog constant.numeric.syslog
+      push: loghost
+  loghost:
+    - match: '[\w-]+'
+      scope: entity.other.attribute-name.loghost.syslog
+      set: process
+  process:
+    - match: ([\w-]+)(?:(\[)(\d+)(\]))?(:)
+      captures:
+        1: support.function.process.syslog
+        2: punctuation.separator.pid.begin.syslog
+        3: meta.pid.syslog meta.number.integer.syslog constant.numeric.value.syslog
+        4: punctuation.separator.mapping.syslog
+      set: structured-data
+  structured-data:
+    - match: '\['
+      scope: punctuation.section.mapping.begin.syslog
+      push:
+        - match: \]
+          scope: punctuation.section.mapping.end.syslog
+          pop: true
+        - match: \w+
+          scope: variable.parameter.syslog
+        - match: =
+          scope: keyword.operator.assignment.syslog
+          push:
+            - match: '[^\s\]]+'
+              scope: constant.other.syslog
+              pop: true
+            - match: (?=\])
+              pop: true
+    - match: (?=\S)
+      set: text
+  text:
+    - match: (\w+)(=)
+      captures:
+        1: variable.parameter.syslog
+        2: keyword.operator.assignment.syslog
+    - match: (')([^']*)(')
+      scope: string.quoted.single.syslog
+      captures:
+        1: punctuation.definition.string.begin.syslog
+        3: punctuation.definition.string.end.syslog
+    - match: (")([^"]*)(")
+      scope: string.quoted.double.syslog
+      captures:
+        1: punctuation.definition.string.begin.syslog
+        3: punctuation.definition.string.end.syslog
+    - match: \d+
+      scope: meta.number.integer.syslog constant.numeric.value.syslog
+    - match: \b(CMD)\b\s+(\()
+      captures:
+        1: entity.name.label.syslog
+        2: punctuation.section.block.begin.syslog
+      embed: scope:source.shell.bash
+      escape: \)
+      escape_captures:
+        0: punctuation.section.block.end.syslog
+    - match: $
+      pop: true

tests/syntax-tests/highlighted/Syslog/example.syslog

@@ -0,0 +1,5 @@
+Apr  4 00:00:01 hostname-here systemd[1]: logrotate.service: Succeeded.
+Apr  4 00:00:01 hostname-here systemd[1]: Finished Rotate log files.
+Apr  4 00:00:21 hostname-here kernel: [55604.908232] audit: type=1400 audit(1617483621.094:28): apparmor="DENIED" operation="capable" profile="/usr/sbin/cups-browsed" pid=59311 comm="cups-browsed" capability=23  capname="sys_nice"
+Apr  4 09:30:01 hostname-here CRON[89278]: (root) CMD ([ -x /etc/init.d/anacron ] && if [ ! -d /run/systemd/system ]; then /usr/sbin/invoke-rc.d anacron start >/dev/null; fi)
+Apr  4 22:00:45 hostname-here dbus-daemon[1094]: [session uid=1000 pid=1094] Successfully activated service 'io.github.celluloid_player.Celluloid'