From 2454cf3345527f484abd003f4e7e9878f026ca70 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustavo=20Henrique=20Montesi=C3=A3o=20de=20Sousa?=
 <gustavo@registro.br>
Date: Fri, 23 Apr 2021 14:49:24 -0300
Subject: [PATCH] Add basic support for the Janet language

---
 rc/filetype/janet.kak | 78 +++++++++++++++++++++++++++++++++++++++++++
 rc/tools/comment.kak  |  6 ++++
 2 files changed, 84 insertions(+)
 create mode 100644 rc/filetype/janet.kak

diff --git a/rc/filetype/janet.kak b/rc/filetype/janet.kak
new file mode 100644
index 00000000..12db77b3
--- /dev/null
+++ b/rc/filetype/janet.kak
@@ -0,0 +1,78 @@
+# http://janet-lang.org
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*[.](janet|jdn) %{
+    set-option buffer filetype janet
+}
+
+
+hook global WinSetOption filetype=janet %{
+    require-module janet
+
+    hook window ModeChange pop:insert:.* -group janet-trim-indent  janet-trim-indent
+    hook window InsertChar \n -group janet-indent janet-indent-on-new-line
+    set-option buffer extra_word_chars ! @ $ '%' ^ & * - _ + = : < > . ?
+
+    hook -once -always window WinSetOption filetype=.* %{ remove-hooks window janet-.+ }
+}
+
+hook -group janet-highlight global WinSetOption filetype=janet %{
+    add-highlighter window/janet ref janet
+    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/janet }
+}
+
+provide-module janet %{
+
+require-module lisp
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+add-highlighter shared/janet regions
+add-highlighter shared/janet/code default-region group
+add-highlighter shared/janet/comment region '(?<!\\)(?:\\\\)*\K#' '$' fill comment
+add-highlighter shared/janet/comment-form region -recurse \( '(?<!\\)(?:\\\\)*\K\(comment ' '\)' fill comment
+add-highlighter shared/janet/string  region '(^\s+```)|(?<!\\)(?:\\\\)*\K"' '(^\s+```)|(?<!\\)(?:\\\\)*"' fill string
+add-highlighter shared/janet/code/ regex \b(nil|true|false)\b 0:value
+add-highlighter shared/janet/code/keyword regex \W\K:[!@$%\^&*\-_+=:<>.?\w]+ 0:value
+add-highlighter shared/janet/code/number regex \W\K(?:[\-+]?\dx?[\der._+a-f]*)\b 0:value
+add-highlighter shared/janet/code/function-definition regex \((?:defn|fn)\s([!@$%\^&*\-_+=:<>.?\w]+) 1:function
+add-highlighter shared/janet/code/function-call regex \(([!@$%\^&*\-_+=:<>.?\w/]+) 1:function
+add-highlighter shared/janet/code/special regex \((def|defn|var|fn|do|quote|if|splice|while|break|set|quasiquote|unquote|upscope)\b\s 1:keyword
+add-highlighter shared/janet/code/ regex \W\K(&|&opt)\W 1:keyword
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+define-command -hidden janet-trim-indent lisp-trim-indent
+
+declare-option \
+    -docstring 'regex matching the head of forms which have options *and* indented bodies' \
+    regex janet_special_indent_forms \
+    '(?:def.*|while|for|fn\*?|if(-.*|)|let.*|loop|seq|with(-.*|)|when(-.*|))|defer|do|match|var'
+
+define-command -hidden janet-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 j
+                execute-keys -draft '"wze<a-k>\A' %opt{janet_special_indent_forms} '\z<ret><a-L>s.\K.*<ret><a-;>;"i<a-Z><gt>'
+            } catch %{
+                # If not special and parameter appears on line 1, indent to parameter
+                execute-keys -draft '"wze<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>'
+    }
+}
+
+}
diff --git a/rc/tools/comment.kak b/rc/tools/comment.kak
index 6a2817b5..e935d8ee 100644
--- a/rc/tools/comment.kak
+++ b/rc/tools/comment.kak
@@ -33,6 +33,12 @@ hook global BufSetOption filetype=clojure %{
     set-option buffer comment_block_end ')'
 }
 
+hook global BufSetOption filetype=janet %{
+    set-option buffer comment_line '#'
+    set-option buffer comment_block_begin '(comment '
+    set-option buffer comment_block_end ')'
+}
+
 hook global BufSetOption filetype=coffee %{
     set-option buffer comment_block_begin '###'
     set-option buffer comment_block_end '###'