Expand nim support

rc/extra/nim.kak

@@ -4,7 +4,7 @@
 # Detection
 # ‾‾‾‾‾‾‾‾‾
 
-hook global BufCreate .*\.nim %{
+hook global BufCreate .*\.nim(s|ble)? %{
     set-option buffer filetype nim
 }
 
@@ -53,9 +53,37 @@ add-highlighter shared/nim/code regex %{'[^'\n]'} 0:string
 
 add-highlighter shared/nim/code regex '#[^\n]+' 0:comment
 
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+def -hidden nim-indent-on-new-line %{
+    eval -draft -itersel %{
+        # copy '#' comment prefix and following white spaces
+        try %{ exec -draft k <a-x> s ^\h*#\h* <ret> y jgh P }
+        # preserve previous line indent
+        try %{ exec -draft \; K <a-&> }
+        # cleanup trailing whitespaces from previous line
+        try %{ exec -draft k <a-x> s \h+$ <ret> d }
+        # indent after line ending with const, let, var, ':' or '='
+        try %{ exec -draft <space> k x <a-k> (:|=|const|let|var)$ <ret> j <a-gt> }
+    }
+}
+
 # Initialization
 # ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
 
 hook -group nim-highlight global WinSetOption filetype=nim %{ add-highlighter window ref nim }
 
+hook global WinSetOption filetype=nim %{
+    set buffer tabstop 2
+    set buffer indentwidth 2
+    hook window InsertChar \n -group nim-indent nim-indent-on-new-line
+    # cleanup trailing whitespaces on current line insert end
+    hook window InsertEnd .* -group nim-indent %{ try %{ exec -draft \; <a-x> s ^\h+$ <ret> d } }
+}
+
 hook -group nim-highlight global WinSetOption filetype=(?!nim).* %{ remove-highlighter window/nim }
+
+hook global WinSetOption filetype=(?!nim).* %{
+    remove-hooks window nim-indent
+}