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diff --git a/autoload/filetype/fish.kak b/autoload/filetype/fish.kak
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+# http://fishshell.com
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*[.](fish) %{
+    set-option buffer filetype fish
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook global WinSetOption filetype=fish %{
+    require-module fish
+
+    hook window ModeChange pop:insert:.* -group fish-trim-indent fish-trim-indent
+    hook window InsertChar .* -group fish-indent fish-indent-on-char
+    hook window InsertChar \n -group fish-insert fish-insert-on-new-line
+    hook window InsertChar \n -group fish-indent fish-indent-on-new-line
+
+    hook -once -always window WinSetOption filetype=.* %{ remove-hooks window fish-.+ }
+}
+
+hook -group fish-highlight global WinSetOption filetype=fish %{
+    add-highlighter window/fish ref fish
+    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/fish }
+}
+
+
+provide-module fish %{
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+add-highlighter shared/fish regions
+add-highlighter shared/fish/code default-region group
+add-highlighter shared/fish/double_string region (?<!\\)(?:\\\\)*\K" (?<!\\)(\\\\)*"  group
+add-highlighter shared/fish/single_string region (?<!\\)(?:\\\\)*\K' (?<!\\)(\\\\)*'  fill string
+add-highlighter shared/fish/comment       region (?<!\\)(?:\\\\)*(?:^|\h)\K# '$' fill comment
+
+add-highlighter shared/fish/double_string/ fill string
+add-highlighter shared/fish/double_string/ regex ((?<!\\)(?:\\\\)*\K\$\w+)|(\{\$\w+\}) 0:variable
+
+add-highlighter shared/fish/code/ regex (?<!\\)(?:\\\\)*\K(\$\w+)|(\{\$\w+\}) 0:variable
+
+# Command names are collected using `builtin --names`.
+add-highlighter shared/fish/code/ regex \b(?<![$-])(and|argparse|begin|bg|bind|block|break|breakpoint|builtin|case|cd|command|commandline|complete|contains|continue|count|disown|echo|else|emit|end|eval|exec|exit|false|fg|for|function|functions|history|if|jobs|math|not|or|printf|pwd|random|read|realpath|return|set|set_color|source|status|string|switch|test|time|true|ulimit|wait|while)\b(?!-) 0:keyword
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+define-command -hidden fish-trim-indent %{
+    evaluate-commands -no-hooks -draft -itersel %{
+        # remove trailing white spaces
+        try %{ execute-keys -draft x 1s^(\h+)$<ret> d }
+    }
+}
+
+define-command -hidden fish-indent-on-char %{
+    evaluate-commands -no-hooks -draft -itersel %{
+        # align middle and end structures to start and indent when necessary
+        try %{ execute-keys -draft x<a-k>^\h*(else)$<ret><a-semicolon><a-?>^\h*(if)<ret>s\A|.\z<ret>1<a-&> }
+        try %{ execute-keys -draft x<a-k>^\h*(end)$<ret><a-semicolon><a-?>^\h*(begin|for|function|if|switch|while)<ret>s\A|.\z<ret>1<a-&> }
+        try %{ execute-keys -draft x<a-k>^\h*(case)$<ret><a-semicolon><a-?>^\h*(switch)<ret>s\A|.\z<ret>1<a-&> }
+    }
+}
+
+define-command -hidden fish-insert-on-new-line %{
+    evaluate-commands -no-hooks -draft -itersel %{
+        # copy '#' comment prefix and following white spaces
+        try %{ execute-keys -draft k x s ^\h*#\h* <ret> y jgh P }
+    }
+}
+
+define-command -hidden fish-indent-on-new-line %{
+    evaluate-commands -no-hooks -draft -itersel %{
+        # preserve previous line indent
+        try %{ execute-keys -draft <semicolon> K <a-&> }
+        # cleanup trailing whitespaces from previous line
+        try %{ execute-keys -draft k x s \h+$ <ret> d }
+        # indent after start structure
+        try %{ execute-keys -draft kx<a-k>^\h*(begin|case|else|for|function|if|while)\b<ret>j<a-gt> }
+    }
+}
+
+}