Add basic PHP syntax highlighting

based on the highlighting for JS

rc/extra/php.kak

@@ -0,0 +1,75 @@
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*[.](php) %{
+    set buffer filetype php
+}
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+addhl -group / regions -default code php  \
+    double_string '"'  (?<!\\)(\\\\)*" '' \
+    single_string "'"  (?<!\\)(\\\\)*' '' \
+    comment       //   '$'             '' \
+    comment       /\*  \*/             ''
+
+addhl -group /php/double_string fill string
+addhl -group /php/single_string fill string
+addhl -group /php/comment       fill comment
+
+addhl -group /php/code regex \$\w* 0:identifier
+addhl -group /php/code regex \b(false|null|parent|self|this|true)\b 0:value
+addhl -group /php/code regex "-?[0-9]*\.?[0-9]+" 0:value
+addhl -group /php/code regex \b((string|int|bool)|[A-Z][a-z].*?)\b 0:type
+addhl -group /php/code regex (?<=\W)/[^\n/]+/[gimy]* 0:meta
+
+# Keywords are collected at
+# http://php.net/manual/en/reserved.keywords.php
+addhl -group /php/code regex \b(__halt_compiler|abstract|and|array|as|break|callable|case|catch|class|clone|const|continue|declare|default|die|do|echo|else|elseif|empty|enddeclare|endfor|endforeach|endif|endswitch|endwhile|eval|exit|extends|final|finally|for|foreach|function|global|goto|if|implements|include|include_once|instanceof|insteadof|interface|isset|list|namespace|new|or|print|private|protected|public|require|require_once|return|static|switch|throw|trait|try|unset|use|var|while|xor|yield|__CLASS__|__DIR__|__FILE__|__FUNCTION__|__LINE__|__METHOD__|__NAMESPACE__|__TRAIT__)\b 0:keyword
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+def -hidden _php_filter_around_selections %{
+    # remove trailing white spaces
+    try %{ exec -draft -itersel <a-x> s \h+$ <ret> d }
+}
+
+def -hidden _php_indent_on_char %<
+    eval -draft -itersel %<
+        # align closer token to its opener when alone on a line
+        try %/ exec -draft <a-h> <a-k> ^\h+[]}]$ <ret> m s \`|.\' <ret> 1<a-&> /
+    >
+>
+
+def -hidden _php_indent_on_new_line %<
+    eval -draft -itersel %<
+        # preserve previous line indent
+        try %{ exec -draft <space> K <a-&> }
+        # filter previous line
+        try %{ exec -draft k : _php_filter_around_selections <ret> }
+        # copy // comments prefix and following white spaces
+        try %{ exec -draft k x s ^\h*\K#\h* <ret> y j p }
+        # indent after lines beginning / ending with opener token
+        try %_ exec -draft k x <a-k> ^\h*[[{]|[[{]$ <ret> j <a-gt> _
+    >
+>
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook -group php-highlight global WinSetOption filetype=php %{ addhl ref php }
+
+hook global WinSetOption filetype=php %{
+    hook window InsertEnd  .* -group php-hooks  _php_filter_around_selections
+    hook window InsertChar .* -group php-indent _php_indent_on_char
+    hook window InsertChar \n -group php-indent _php_indent_on_new_line
+}
+
+hook -group php-highlight global WinSetOption filetype=(?!php).* %{ rmhl php }
+
+hook global WinSetOption filetype=(?!php).* %{
+    rmhooks window php-indent
+    rmhooks window php-hooks
+}