From 877cc9cf8846996812359a42c82b224d6d6d4f6d Mon Sep 17 00:00:00 2001
From: Andrey Listopadov <andreyorst@gmail.com>
Date: Fri, 26 Feb 2021 19:29:07 +0300
Subject: [PATCH] add fennel filetype

---
 rc/filetype/fennel.kak | 109 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 rc/filetype/fennel.kak

diff --git a/rc/filetype/fennel.kak b/rc/filetype/fennel.kak
new file mode 100644
index 00000000..e6d604fe
--- /dev/null
+++ b/rc/filetype/fennel.kak
@@ -0,0 +1,109 @@
+# http://fennel-lang.org
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*[.]fnl %{
+    set-option buffer filetype fennel
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+hook global WinSetOption filetype=fennel %{
+    require-module fennel
+    fennel-configure-window
+}
+
+hook -group fennel-highlight global WinSetOption filetype=fennel %{
+    add-highlighter window/fennel ref fennel
+    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/fennel }
+}
+
+provide-module fennel %{
+
+require-module lisp
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+add-highlighter shared/fennel regions
+add-highlighter shared/fennel/code default-region group
+add-highlighter shared/fennel/comment region '(?<!\\)(?:\\\\)*\K;' '$' fill comment
+add-highlighter shared/fennel/shebang region '(?<!\\)(?:\\\\)*\K#!' '$' fill comment
+add-highlighter shared/fennel/string region '(?<!\\)(?:\\\\)*\K"' '(?<!\\)(?:\\\\)*"' fill string
+add-highlighter shared/fennel/colon-string region '\W\K:[-\w?\\^_!$%&*+./@|<=>]' '(?![-\w?\\^_!$%&*+./@|<=>])' fill keyword
+add-highlighter shared/fennel/code/ regex \\(?:space|tab|newline|return|backspace|formfeed|u[0-9a-fA-F]{4}|o[0-3]?[0-7]{1,2}|.)\b 0:string
+
+evaluate-commands %sh{
+    # Grammar
+    keywords="require-macros eval-compiler doc lua hashfn macro macros import-macros pick-args pick-values macroexpand macrodebug
+              do values if when each for fn lambda λ partial while set global var local let tset set-forcibly! doto match or and
+              not not= collect icollect rshift lshift bor band bnot bxor with-open"
+    re_keywords='\\$ \\$1 \\$2 \\$3 \\$4 \\$5 \\$6 \\$7 \\$8 \\$9 \\$\\.\\.\\.'
+    builtins="_G _VERSION arg assert bit32 collectgarbage coroutine debug
+              dofile error getfenv getmetatable io ipairs length load
+              loadfile loadstring math next os package pairs pcall
+              print rawequal rawget rawlen rawset require select setfenv
+              setmetatable string table tonumber tostring type unpack xpcall"
+
+    join() { sep=$2; eval set -- $1; IFS="$sep"; echo "$*"; }
+
+# Add the language's grammar to the static completion list
+    printf %s\\n "declare-option str-list fennel_static_words $(join "${keywords} ${builtins} false nil true" ' ')"
+
+    # Highlight keywords
+    printf %s "
+        add-highlighter shared/fennel/code/keywords regex \b($(join "${keywords} ${re_keywords}" '|'))\b 0:keyword
+        add-highlighter shared/fennel/code/builtins regex \b($(join "${builtins}" '|'))\b 0:builtin
+    "
+}
+
+add-highlighter shared/fennel/code/operator regex (\.|\?\.|\+|\.\.|\^|-|\*|%|/|>|<|>=|<=|=|\.\.\.|:|->|->>|-\?>|-\?>>) 0:operator
+add-highlighter shared/fennel/code/value regex \b(false|nil|true|[0-9]+(:?\.[0-9])?(:?[eE]-?[0-9]+)?|0x[0-9a-fA-F])\b 0:value
+add-highlighter shared/fennel/code/function_declaration regex \((?:fn|lambda|λ)\s+([\S]+) 1:function
+add-highlighter shared/fennel/code/method_call regex (?:\w+|\$[0-9]{0,1}):(\S+)\b 1:function
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+define-command -hidden fennel-configure-window %{
+    set-option window static_words %opt{fennel_static_words}
+
+    hook window ModeChange pop:insert:.* -group fennel-trim-indent fennel-trim-indent
+    hook window InsertChar \n -group fennel-indent fennel-indent-on-new-line
+
+    set-option buffer extra_word_chars '_' . / * ? + - < > ! : "'"
+    hook -once -always window WinSetOption filetype=.* %{ remove-hooks window fennel-.+ }
+}
+
+define-command -hidden fennel-trim-indent lisp-trim-indent
+
+declare-option \
+    -docstring 'regex matching the head of forms which have options *and* indented bodies' \
+    regex fennel_special_indent_forms \
+    '(?:if|when|each|for|fn|lambda|λ|partial|while|local|var|doto|let)'
+
+define-command -hidden fennel-indent-on-new-line %{
+    # registers: i = best align point so far; w = start of first word of form
+    evaluate-commands -draft -save-regs '/"|^@iw' -itersel %{
+        execute-keys -draft 'gk"iZ'
+        try %{
+            execute-keys -draft '[bl"i<a-Z><gt>"wZ'
+
+            try %{
+                # If a special form, indent another (indentwidth - 1) spaces
+                execute-keys -draft '"wze<a-K>[\s()\[\]\{\}]<ret><a-k>\A' %opt{fennel_special_indent_forms} '\z<ret>'
+                execute-keys -draft '"wze<a-L>s.{' %sh{printf $(( kak_opt_indentwidth - 1 ))} '}\K.*<ret><a-;>;"i<a-Z><gt>'
+            } catch %{
+                # If not special and parameter appears on line 1, indent to parameter
+                execute-keys -draft '"wz<a-K>[()[\]{}]<ret>e<a-K>[\s()\[\]\{\}]<ret><a-l>s\h\K[^\s].*<ret><a-;>;"i<a-Z><gt>'
+            }
+        }
+        try %{ execute-keys -draft '[rl"i<a-Z><gt>' }
+        try %{ execute-keys -draft '[Bl"i<a-Z><gt>' }
+        execute-keys -draft ';"i<a-z>a&<space>'
+    }
+}
+
+}