tooling: add syntax highlighting for Kakoune

Signed-off-by: Annwan <annwan@annwan.me>

editors/kak/a48s.kak

@@ -0,0 +1,55 @@
+# ain48 assembly syntax highlighting
+# put this in your autoload folder in ~/.config/kak/autoload and it should work
+# note: if you are *creating* an autoload folder in that location,
+# the *default* autoload scripts in /usr/share/kak/autoload will not trigger,
+# so it might be a good idea to copy the contents of that directory.
+
+hook global BufCreate .*\.(a|ain)48(s|asm) %{
+    set-option buffer filetype a48s
+}
+
+hook global WinSetOption filetype=a48s %{
+    require-module a48s
+    hook -once -always window WinSetOption filetype=.* %{
+        remove-hooks window a48s-.+
+    }
+}
+
+hook -group a48s-highlight global WinSetOption filetype=a48s %{
+    add-highlighter window/a48s ref a48s
+    hook -once -always window WinSetOption filetype=.* %{
+        remove-highlighter window/a48s
+    }
+}
+
+provide-module a48s %{
+
+add-highlighter shared/a48s regions
+add-highlighter shared/a48s/ region ';' '\n' fill comment
+add-highlighter shared/a48s/dqstring region '"' '"' group
+add-highlighter shared/a48s/dqstring/ fill string
+add-highlighter shared/a48s/dqstring/ \
+    regex (\\[\\abefhnrtv\n])|(\\.) 1:keyword 2:Error
+add-highlighter shared/a48s/code default-region group
+
+# immediates
+add-highlighter shared/a48s/code/ regex \
+(?i)#-?(s[0-5]+|o[0-7]+|b[01]+|x[0-9]+)\b \
+0:value
+
+# registers
+add-highlighter shared/a48s/code/ regex (?i)%([a-z0-7]+)\b 0:builtin
+
+# directives
+add-highlighter shared/a48s/code/ regex \.[a-zA-Z]+ 0:type
+
+# labels
+add-highlighter shared/a48s/code/ regex ^\h*[A-Za-z0-9_.-]+: 0:operator
+
+# instructions
+add-highlighter shared/a48s/code/ regex \
+(?i)\b((p?(add|dem|dvd|i[mp]?lg|mpl|rsd|str))|(n?[enpu]?i)|(ir|nc)?rv|(nc)?ivc|aeq|an|aut|cess|cst|dem|dst|et|(p?[sbq])?(lg|sc)|nam|nec|sim|tsc|vel)\b \
+0:keyword
+# the regex is painfully long but i can't do anything about that so...
+
+}