Add syntax highlighting for ssh & sshd config files (rxi#85)

Author: dflock

README.md

@@ -90,6 +90,7 @@ Plugin | Description
 [`language_ruby`](plugins/language_ruby.lua?raw=1) | Syntax for the [Ruby](https://www.ruby-lang.org/) programming language
 [`language sass`](plugins/language_sass.lua?raw=1) | Syntax for the [Sass](https://sass-lang.com/) CSS preprocessor
 [`language_sh`](plugins/language_sh.lua?raw=1) | Syntax for shell scripting language
+[`language_ssh_config`](plugins/language_ssh_config.lua?raw=1) | Syntax for ssh & sshd config files
 [`language_tcl`](plugins/language_tcl.lua?raw=1) | Syntax for the [Tcl](https://www.tcl.tk/) programming language
 [`language_teal`](plugins/language_teal.lua?raw=1) | Syntax for the [Teal](https://github.com/teal-language/tl) programming language, a typed dialect of Lua.
 [`language_ts`](plugins/language_ts.lua?raw=1) | Syntax for the [TypeScript](https://www.typescriptlang.org/) programming language, a typed dialect of JavaScript.

plugins/language_ssh_config.lua

@@ -0,0 +1,58 @@
+-- mod-version:2 -- lite-xl 2.0
+local syntax = require "core.syntax"
+
+syntax.add {
+  files = { "sshd?/?_?config$" },
+  comment = '#',
+  patterns = {
+    { pattern = "#.*\n",        type = "comment"  },
+    { pattern = "%d+",          type = "number"   },
+    { pattern = "[%a_][%w_]*",  type = "symbol"   },
+    { pattern = "@",            type = "operator" },
+  },
+  symbols = {
+    -- ssh config
+    ["Host"]                         = "function",
+    ["ProxyCommand"]                 = "function",
+
+    ["HostName"]                     = "keyword",
+    ["IdentityFile"]                 = "keyword",
+    ["IdentitiesOnly"]               = "keyword",
+    ["User"]                         = "keyword",
+    ["Port"]                         = "keyword",
+
+    ["ForwardAgent"]                 = "keyword",
+    ["ForwardX11"]                   = "keyword",
+    ["ForwardX11Trusted"]            = "keyword",
+    ["HostbasedAuthentication"]      = "keyword",
+    ["GSSAPIAuthentication"]         = "keyword",
+    ["GSSAPIDelegateCredentials"]    = "keyword",
+    ["GSSAPIKeyExchange"]            = "keyword",
+    ["GSSAPITrustDNS"]               = "keyword",
+    ["BatchMode"]                    = "keyword",
+    ["CheckHostIP"]                  = "keyword",
+    ["AddressFamily"]                = "keyword",
+    ["ConnectTimeout"]               = "keyword",
+    ["StrictHostKeyChecking"]        = "keyword",
+    ["Ciphers"]                      = "keyword",
+    ["MACs"]                         = "keyword",
+    ["EscapeChar"]                   = "keyword",
+    ["Tunnel"]                       = "keyword",
+    ["TunnelDevice"]                 = "keyword",
+    ["PermitLocalCommand"]           = "keyword",
+    ["VisualHostKey"]                = "keyword",
+    ["RekeyLimit"]                   = "keyword",
+    ["SendEnv"]                      = "keyword",
+    ["HashKnownHosts"]               = "keyword",
+    ["GSSAPIAuthentication"]         = "keyword",
+
+    -- sshd config
+    ["Subsystem"]                    = "keyword2",
+
+
+    ["yes"]      = "literal",
+    ["no"]       = "literal",
+    ["any"]      = "literal",
+    ["ask"]      = "literal",
+  },
+}