add rc/ruby.kak

rc/ruby.kak

@@ -0,0 +1,102 @@
+# http://ruby-lang.org
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufSetOption mimetype=text/x-ruby %{
+    set buffer filetype ruby
+}
+
+hook global BufCreate .*(([.](rb))|(irbrc)|(pryrc)|(Capfile|[.]cap)|(Gemfile)|(Guardfile)|(Rakefile|[.]rake)|(Thorfile|[.]thor)|(Vagrantfile)) %{
+    set buffer filetype ruby
+}
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+addhl -group / multi_region -default code ruby  \
+    double_string '"' (?<!\\)(\\\\)*"        '' \
+    single_string "'" "'"                    '' \
+    backtick      '`' (?<!\\)(\\\\)*`        '' \
+    regex         '/' (?<!\\)(\\\\)*/[imox]* '' \
+    comment       '#' '$'                    '' \
+    comment       ^begin= ^=end              '' \
+    literal       '%[iqrswxIQRSWX]\Q(' '\Q)' '' \
+    literal       '%[iqrswxIQRSWX]\Q{' '\Q}' '' \
+    literal       '%[iqrswxIQRSWX]\Q[' '\Q]' '' \
+    literal       '%[iqrswxIQRSWX]\Q<' '\Q>' ''
+
+# Regular expression flags are: i → ignore case, m → multi-lines, o → only interpolate #{} blocks once, x → extended mode (ignore white spaces)
+# Literals are: i → array of symbols, q → string, r → regular expression, s → symbol, w → array of words, x → capture shell result
+
+addhl -group /ruby/double_string fill string
+addhl -group /ruby/double_string region interpolation \Q#{ \} \{
+addhl -group /ruby/double_string/interpolation/content fill macro
+addhl -group /ruby/single_string fill string
+addhl -group /ruby/backtick fill macro
+addhl -group /ruby/backtick region interpolation \Q#{ \} \{
+addhl -group /ruby/backtick/interpolation/content fill macro
+addhl -group /ruby/regex fill macro
+addhl -group /ruby/regex region interpolation \Q#{ \} \{
+addhl -group /ruby/regex/interpolation/content fill macro
+addhl -group /ruby/comment fill comment
+addhl -group /ruby/literal fill macro
+
+addhl -group /ruby/code regex ([$@][a-z]\w+)|(\W\K:[a-z]\w+[=?!]?) 0:identifier
+addhl -group /ruby/code regex \<(require|include)\>|\<([a-z]\w+:) 0:macro
+addhl -group /ruby/code regex \<(attr_(reader|writer|accessor))\> 0:attribute
+
+# Keywords are collected searching for keyword_ at
+# https://github.com/ruby/ruby/blob/trunk/parse.y
+addhl -group /ruby/code regex \<(alias|and|begin|break|case|class|def|defined|do|else|elsif|end|ensure|false|for|if|in|module|next|nil|not|or|redo|rescue|retry|return|self|super|then|true|undef|unless|until|when|while|yield)\> 0:keyword
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+def -hidden _ruby_filter_around_selections %{
+    eval -draft -itersel %{
+        exec <a-x>
+        # remove trailing white spaces
+        try %{ exec -draft s \h+$ <ret> d }
+    }
+}
+
+def -hidden _ruby_indent_on_char %{
+    eval -draft -itersel %{
+        # deindent on (else|elsif|end|rescue|when) keyword insertion
+        try %{ exec -draft <space> <a-i>w <a-k> (else|elsif|end|rescue|when) <ret> <a-lt> }
+    }
+}
+
+def -hidden _ruby_indent_on_new_line %{
+    eval -draft -itersel %{
+        # preserve previous line indent
+        try %{ exec -draft <space> K <a-&> }
+        # filter previous line
+        try %{ exec -draft k : _ruby_filter_around_selections <ret> }
+        # copy '#' comment prefix and following white spaces
+        try %{ exec -draft k x s ^\h*\K#\h* <ret> y j p }
+        # indent after (else|elsif|rescue|when) keywords
+        try %_ exec -draft <space> k x <a-k> (else|elsif|rescue|when) <ret> j <a-gt> _
+        # indent after (begin|case|class|def|do|if|loop|module|unless|until|while) keywords and add 'end' keyword
+        try %{ exec -draft <space> k x <a-k> (begin|case|class|def|do|(?<!els)if|loop|module|unless|until|while) <ret> x y p j a end <esc> k <a-gt> }
+    }
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook global WinSetOption filetype=ruby %{
+    addhl ref ruby
+
+    hook window InsertEnd  .* -group ruby-hooks  _ruby_filter_around_selections
+    hook window InsertChar .* -group ruby-indent _ruby_indent_on_char
+    hook window InsertChar \n -group ruby-indent _ruby_indent_on_new_line
+}
+
+hook global WinSetOption filetype=(?!ruby).* %{
+    rmhl ruby
+    rmhooks window ruby-indent
+    rmhooks window ruby-hooks
+}