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+# http://kakoune.org
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate (.*/)?(\.Rprofile|.*\.[rR]) %{
+    set-option buffer filetype r
+}
+
+provide-module r %§
+
+# Highlighters & Completion
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+add-highlighter shared/r regions
+add-highlighter shared/r/code default-region group
+add-highlighter shared/r/double_string region '"'   (?<!\\)(\\\\)*"  fill string
+add-highlighter shared/r/single_string region "'"   (?<!\\)(\\\\)*'  fill string
+add-highlighter shared/r/comment       region '#'   '$'              fill comment
+add-highlighter shared/r/identifier    region '`'   (?<!\\)(\\\\)*`  fill attribute
+
+# see base::NumericConstants
+add-highlighter shared/r/code/ regex '(?i)\b(?<![.\d])\d+(\.\d*)?(e[-+]?\d+)?(?I)[iL]?(?![\d.e\w])' 0:value
+add-highlighter shared/r/code/ regex '(?i)(?<![.\d\w])\.\d+(e[-+]?\d+)?(?I)[iL]?(?![\d.e])' 0:value
+add-highlighter shared/r/code/ regex '(?i)\b(?<![.\d])0x[0-9a-f]+?(p[-+]?\d+)?(?I)[iL]?(?![\d.e\w])' 0:value
+
+evaluate-commands %sh{
+    # see base::Reserved
+    values="TRUE|FALSE|NULL|Inf|NaN|NA|NA_integer_|NA_real_|NA_complex_|NA_character_|\.{3}|\.{2}\d+|"
+    keywords="if|else|repeat|while|function|for|in|next|break"
+
+    # see base::Ops and methods::Ops
+    math_functions="abs|sign|sqrt|floor|ceiling|trunc|round|signif|exp|log|expm1|log1p|cos|sin|tan|cospi|sinpi|tanpi|acos|asin|atan|cosh|sinh|tanh|acosh|asinh|atanh|lgamma|gamma|digamma|trigamma"
+    summary_functions="all|any|sum|prod|min|max|range"
+    complex_functions="Arg|Conj|Im|Mod|Re"
+
+    # Add the language's grammar to the static completion list
+    printf %s\\n "hook global WinSetOption filetype=python %{
+        set-option window static_words ${values} ${keywords} ${math_functions} ${summary_functions} ${complex_functions}
+    }" | tr '|' ' '
+
+    printf %s "
+        add-highlighter shared/r/code/ regex '\b(${values})\b' 0:value
+        add-highlighter shared/r/code/ regex '\b(${keywords})\b' 0:keyword
+        add-highlighter shared/r/code/ regex '\b(${math_functions}|${summary_functions}|${complex_functions})\b' 0:function
+    "
+}
+
+# see base::Syntax
+add-highlighter shared/r/code/ regex (?<=[\w\s\d'"_)])(\$|@|\^|-|\+|%[^%^\n]+%|\*|/|<|>|<=|>=|!|&{1,2}|\|{1,2}|~|\?|:{1,3}|\[{1,2}|\]{1,2}|={1,2}|<{1,2}-|->{1,2}|!=|%%) 0:operator
+
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+define-command -hidden r-trim-indent %{
+    # remove the line if it's empty when leaving the insert mode
+    try %{ execute-keys -draft x 1s^(\h+)$<ret> d }
+}
+
+define-command -hidden r-indent-on-newline %< evaluate-commands -draft -itersel %<
+    execute-keys <semicolon>
+    try %<
+        # if previous line closed a paren (possibly followed by words and a comment),
+        # copy indent of the opening paren line
+        execute-keys -draft kx 1s(\))(\h+\w+)*\h*(\;\h*)?(?:#[^\n]+)?\n\z<ret> m<a-semicolon>J <a-S> 1<a-&>
+    > catch %<
+        # else indent new lines with the same level as the previous one
+        execute-keys -draft K <a-&>
+    >
+    # remove previous empty lines resulting from the automatic indent
+    try %< execute-keys -draft k x <a-k>^\h+$<ret> Hd >
+    # indent after an opening brace or parenthesis at end of line
+    try %< execute-keys -draft k x s[{(]\h*$<ret> j <a-gt> >
+    # indent after a statement not followed by an opening brace
+    try %< execute-keys -draft k x s\)\h*(?:#[^\n]+)?\n\z<ret> \
+                               <a-semicolon>mB <a-k>\A\b(if|for|while)\b<ret> <a-semicolon>j <a-gt> >
+    try %< execute-keys -draft k x s \belse\b\h*(?:#[^\n]+)?\n\z<ret> \
+                               j <a-gt> >
+    # deindent after a single line statement end
+    try %< execute-keys -draft K x <a-k>\;\h*(#[^\n]+)?$<ret> \
+                               K x s\)(\h+\w+)*\h*(#[^\n]+)?\n([^\n]*\n){2}\z<ret> \
+                               MB <a-k>\A\b(if|for|while)\b<ret> <a-S>1<a-&> >
+    try %< execute-keys -draft K x <a-k>\;\h*(#[^\n]+)?$<ret> \
+                               K x s \belse\b\h*(?:#[^\n]+)?\n([^\n]*\n){2}\z<ret> \
+                               <a-S>1<a-&> >
+    # align to the opening parenthesis or opening brace (whichever is first)
+    # on a previous line if its followed by text on the same line
+    try %< evaluate-commands -draft %<
+        # Go to opening parenthesis and opening brace, then select the most nested one
+        try %< execute-keys [c [({],[)}] <ret> >
+        # Validate selection and get first and last char
+        execute-keys <a-k>\A[{(](\h*\S+)+\n<ret> <a-K>"(([^"]*"){2})*<ret> <a-K>'(([^']*'){2})*<ret> <a-:><a-semicolon>L <a-S>
+        # Remove possibly incorrect indent from new line which was copied from previous line
+        try %< execute-keys -draft , <a-h> s\h+<ret> d >
+        # Now indent and align that new line with the opening parenthesis/brace
+        execute-keys 1<a-&> &
+     > >
+> >
+
+define-command -hidden r-indent-on-opening-curly-brace %[
+    # align indent with opening paren when { is entered on a new line after the closing paren
+    try %[ execute-keys -draft -itersel h<a-F>)M <a-k> \A\(.*\)\h*\n\h*\{\z <ret> <a-S> 1<a-&> ]
+]
+
+define-command -hidden r-indent-on-closing-curly-brace %[
+    # align to opening curly brace when alone on a line
+    try %[
+        # in case open curly brace follows a closing paren, align indent with opening paren
+        execute-keys -itersel -draft <a-h><a-:><a-k>^\h+\}$<ret>hm <a-F>)M <a-k> \A\(.*\)\h\{.*\}\z <ret> <a-S>1<a-&>
+    ] catch %[
+        # otherwise align with open curly brace
+        execute-keys -itersel -draft <a-h><a-:><a-k>^\h+\}$<ret>hm<a-S>1<a-&>
+    ] catch %[]
+]
+
+define-command -hidden r-insert-on-newline %[ evaluate-commands -itersel -draft %[
+    execute-keys <semicolon>
+    try %[
+        evaluate-commands -draft -save-regs '/"' %[
+            # copy the commenting prefix
+            execute-keys -save-regs '' k x1s^\h*(#+\h*)<ret> y
+            try %[
+                # if the previous comment isn't empty, create a new one
+                execute-keys x<a-K>^\h*#+\h*$<ret> jxs^\h*<ret>P
+            ] catch %[
+                # if there is no text in the previous comment, remove it completely
+                execute-keys d
+            ]
+        ]
+    ]
+] ]
+
+§
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook -group r-highlight global WinSetOption filetype=r %{
+    require-module r
+    add-highlighter window/r ref r
+    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/r }
+}
+
+hook global WinSetOption filetype=r %~
+    require-module r
+    hook window ModeChange pop:insert:.* r-trim-indent
+    hook window InsertChar \n        r-insert-on-newline
+    hook window InsertChar \n        r-indent-on-newline
+    hook window InsertChar \{        r-indent-on-opening-curly-brace
+    hook window InsertChar \}        r-indent-on-closing-curly-brace
+
+    hook -once -always window WinSetOption filetype=.* %{ remove-hooks window r-.+ }
+~