Add Elixir highlighter

rc/extra/elixir.kak

@@ -0,0 +1,85 @@
+# http://elixir-lang.org
+# ----------------------
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*[.](ex|exs) %{
+    set buffer filetype elixir
+}
+
+# Faces
+# -----
+
+face ElixirAtom yellow
+face ElixirUnderscore white+d
+face ElixirAttribute green+d
+face ElixirSpecialKeyword blue+b
+face ElixirEnv red+b
+face ElixirOperator rgb:a8a8a8
+face ElixirInterpolation rgb:00d7ff
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+add-highlighter -group / regions -default code elixir \
+    double_string   '"'    (?<!\\)(\\\\)*"         '' \
+    double_string   '"""'  (?<!\\)(\\\\)*"""       '' \
+    single_string   "'"    (?<!\\)(\\\\)*'         '' \
+    comment         '#'    '$'                     ''
+
+add-highlighter -group /elixir/comment fill comment
+add-highlighter -group /elixir/double_string  fill string
+add-highlighter -group /elixir/double_string regions regions interpolation \Q#{ \} \{
+add-highlighter -group /elixir/double_string/regions/interpolation fill ElixirInterpolation
+add-highlighter -group /elixir/single_string  fill string
+add-highlighter -group /elixir/code regex ':[\w_]+\b' 0:ElixirAtom
+add-highlighter -group /elixir/code regex '[\w_]+:' 0:ElixirAtom
+add-highlighter -group /elixir/code regex '[A-Z][\w_]+\b' 0:module
+add-highlighter -group /elixir/code regex '(:[\w_]+)(\.)' 1:module
+add-highlighter -group /elixir/code regex '\b_\b' 0:ElixirUnderscore
+add-highlighter -group /elixir/code regex '\b_[\w_]+\b' 0:ElixirUnderscore
+add-highlighter -group /elixir/code regex \b(true|false|nil)\b 0:value
+add-highlighter -group /elixir/code regex (->|<-|<<|>>|=>) 0:ElixirOperator
+add-highlighter -group /elixir/code regex \b(require|alias|use|import)\b 0:ElixirSpecialKeyword
+add-highlighter -group /elixir/code regex \b(__MODULE__|__DIR__|__ENV__|__CALLER__)\b 0:ElixirEnv
+add-highlighter -group /elixir/code regex \b(def|defp|defmacro|defmacrop|defstruct|defmodule|defimpl|defprotocol|defoverridable)\b 0:keyword
+add-highlighter -group /elixir/code regex \b(fn|do|end|case|if|else|unless|var!|for|cond|quote|unquote|receive|with|raise|reraise|try|catch)\b 0:keyword
+add-highlighter -group /elixir/code regex '@[\w_]+\b' 0:ElixirAttribute
+add-highlighter -group /elixir/code regex '\b\d+[\d_]*\b' 0:value
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+def -hidden elixir-filter-around-selections %{
+    # remove trailing white spaces
+    try %{ exec -draft -itersel <a-x> s \h+$ <ret> d }
+}
+
+def -hidden elixir-indent-on-new-line %{
+    eval -draft -itersel %{
+        # copy -- comments prefix and following white spaces 
+        try %{ exec -draft k <a-x> s ^\h*\K--\h* <ret> y gh j P }
+        # preserve previous line indent
+        try %{ exec -draft \; K <a-&> }
+        # indent after line ending with: 
+	# try %{ exec -draft k x <a-k> (do|else|->)$ <ret> & }
+	# filter previous line
+        try %{ exec -draft k : elixir-filter-around-selections <ret> }
+        # indent after lines ending with do or ->
+        try %{ exec -draft \\; k x <a-k> ^.+(do|->)$ <ret> j <a-gt> }
+    }
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook -group elixir-highlight global WinSetOption filetype=elixir %{ add-highlighter ref elixir }
+
+hook global WinSetOption filetype=elixir %{
+    hook window InsertEnd  .* -group elixir-hooks  elixir-filter-around-selections
+    hook window InsertChar \n -group elixir-indent elixir-indent-on-new-line
+}
+
+hook -group elixir-highlight global WinSetOption filetype=(?!elixir).* %{ remove-highlighter elixir }
+