From 904cec3c4a329cf89fc3219d359239910d61f3f6 Mon Sep 17 00:00:00 2001
From: thing1 <thing1@seacrossedlovers.xyz>
Date: Tue, 28 Jan 2025 09:14:32 +0000
Subject: init commit

---
 autoload/filetype/go.kak | 174 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 174 insertions(+)
 create mode 100644 autoload/filetype/go.kak

(limited to 'autoload/filetype/go.kak')

diff --git a/autoload/filetype/go.kak b/autoload/filetype/go.kak
new file mode 100644
index 0000000..4f8407c
--- /dev/null
+++ b/autoload/filetype/go.kak
@@ -0,0 +1,174 @@
+# https://golang.org/
+#
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*\.go %{
+    set-option buffer filetype go
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook global WinSetOption filetype=go %{
+    require-module go
+
+    set-option window static_words %opt{go_static_words}
+
+    # cleanup trailing whitespaces when exiting insert mode
+    hook window ModeChange pop:insert:.* -group go-trim-indent %{ try %{ execute-keys -draft xs^\h+$<ret>d } }
+    hook window InsertChar \n -group go-indent go-indent-on-new-line
+    hook window InsertChar \{ -group go-indent go-indent-on-opening-curly-brace
+    hook window InsertChar \} -group go-indent go-indent-on-closing-curly-brace
+    hook window InsertChar \n -group go-comment-insert go-insert-comment-on-new-line
+    hook window InsertChar \n -group go-closing-delimiter-insert go-insert-closing-delimiter-on-new-line
+
+    alias window alt go-alternative-file
+
+    hook -once -always window WinSetOption filetype=.* %{
+        remove-hooks window go-.+
+        unalias window alt go-alternative-file
+    }
+}
+
+hook -group go-highlight global WinSetOption filetype=go %{
+    add-highlighter window/go ref go
+    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/go }
+}
+
+provide-module go %§
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+add-highlighter shared/go regions
+add-highlighter shared/go/code default-region group
+add-highlighter shared/go/back_string region '`' '`' fill string
+add-highlighter shared/go/double_string region '"' (?<!\\)(\\\\)*" fill string
+add-highlighter shared/go/single_string region "'" (?<!\\)(\\\\)*' fill string
+add-highlighter shared/go/comment region /\* \*/ fill comment
+add-highlighter shared/go/comment_line region '//' $ fill comment
+
+add-highlighter shared/go/code/numeric regex %{-?([0-9]*\.(?!0[xX]))?\b([0-9]+|0[xX][0-9a-fA-F]+)\.?([eE][+-]?[0-9]+)?i?\b} 0:value
+add-highlighter shared/go/code/function regex "\b(\w*)\b\h*(?:\[[\w\s\.,]*\])?\h*\(" 1:function
+add-highlighter shared/go/code/operator regex "(\+|-|\*|/|%|\+\+|--|\+=|-=|\*=|/=|%=|==|!=|>|<|>=|<=|&|&&|\|\||!|<-|:=|\.\.\.)" 1:operator
+
+evaluate-commands %sh{
+    # Grammar
+    keywords='break default func interface select case defer go map struct
+              chan else goto package switch const fallthrough if range type
+              continue for import return var'
+    types='any bool byte chan comparable complex128 complex64 error float32 float64 int int16 int32
+           int64 int8 interface intptr map rune string struct uint uint16 uint32 uint64 uint8 uintptr'
+    values='false true nil iota'
+    functions='append cap close complex copy delete imag len make new panic print println real recover'
+
+    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 go_static_words $(join "${keywords} ${attributes} ${types} ${values} ${functions}" ' ')"
+
+    # Highlight keywords
+    printf %s "
+        add-highlighter shared/go/code/keyword   regex \b($(join "${keywords}" '|'))\b 0:keyword
+        add-highlighter shared/go/code/attribute regex \b($(join "${attributes}" '|'))\b 0:attribute
+        add-highlighter shared/go/code/type      regex \b($(join "${types}" '|'))\b 0:type
+        add-highlighter shared/go/code/value     regex \b($(join "${values}" '|'))\b 0:value
+        add-highlighter shared/go/code/builtin   regex \b($(join "${functions}" '|'))\b 0:builtin
+    "
+}
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+define-command go-alternative-file -docstring 'Jump to the alternate file (implementation ↔ test)' %{ evaluate-commands %sh{
+    case $kak_buffile in
+        *_test.go)
+            altfile=${kak_buffile%_test.go}.go
+            test ! -f "$altfile" && echo "fail 'implementation file not found'" && exit
+        ;;
+        *.go)
+            altfile=${kak_buffile%.go}_test.go
+            test ! -f "$altfile" && echo "fail 'test file not found'" && exit
+        ;;
+        *)
+            echo "fail 'alternative file not found'" && exit
+        ;;
+    esac
+    printf "edit -- '%s'" "$(printf %s "$altfile" | sed "s/'/''/g")"
+}}
+
+define-command -hidden go-indent-on-new-line %~
+    evaluate-commands -draft -itersel %=
+        # preserve previous line indent
+        try %{ execute-keys -draft <semicolon>K<a-&> }
+        # cleanup trailing white spaces on the previous line
+        try %{ execute-keys -draft kx s \h+$ <ret>d }
+        try %<
+            try %{ # line comment
+                execute-keys -draft kx s ^\h*// <ret>
+            } catch %{ # block comment
+                execute-keys -draft <a-?> /\* <ret> <a-K>\*/<ret>
+            }
+        > catch %<
+            # indent after lines with an unclosed { or (
+            try %< execute-keys -draft [c[({],[)}] <ret> <a-k> \A[({][^\n]*\n[^\n]*\n?\z <ret> j<a-gt> >
+            # indent after a switch's case/default statements
+            try %[ execute-keys -draft kx <a-k> ^\h*(case|default).*:$ <ret> j<a-gt> ]
+            # deindent closing brace(s) when after cursor
+            try %[ execute-keys -draft x <a-k> ^\h*[})] <ret> gh / [})] <ret> m <a-S> 1<a-&> ]
+        >
+    =
+~
+
+define-command -hidden go-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> s \A|.\z <ret> 1<a-&> ]
+]
+
+define-command -hidden go-indent-on-closing-curly-brace %[
+    # align to opening curly brace when alone on a line
+    try %[ execute-keys -itersel -draft <a-h><a-k>^\h+\}$<ret>hms\A|.\z<ret>1<a-&> ]
+]
+
+define-command -hidden go-insert-comment-on-new-line %[
+    evaluate-commands -no-hooks -draft -itersel %[
+        # copy // comments prefix and following white spaces
+        try %{ execute-keys -draft <semicolon><c-s>kx s ^\h*\K/{2,}\h* <ret> y<c-o>P<esc> }
+    ]
+]
+
+define-command -hidden go-insert-closing-delimiter-on-new-line %[
+    evaluate-commands -no-hooks -draft -itersel %[
+        # Wisely add '}'.
+        evaluate-commands -save-regs x %[
+            # Save previous line indent in register x.
+            try %[ execute-keys -draft kxs^\h+<ret>"xy ] catch %[ reg x '' ]
+            try %[
+                # Validate previous line and that it is not closed yet.
+                execute-keys -draft kx <a-k>^<c-r>x.*\{\h*\(?\h*$<ret> j}iJx <a-K>^<c-r>x\)?\h*\}<ret>
+                # Insert closing '}'.
+                execute-keys -draft o<c-r>x}<esc>
+                # Delete trailing '}' on the line below the '{'.
+                execute-keys -draft xs\}$<ret>d
+            ]
+        ]
+
+        # Wisely add ')'.
+        evaluate-commands -save-regs x %[
+            # Save previous line indent in register x.
+            try %[ execute-keys -draft kxs^\h+<ret>"xy ] catch %[ reg x '' ]
+            try %[
+                # Validate previous line and that it is not closed yet.
+                execute-keys -draft kx <a-k>^<c-r>x.*\(\h*$<ret> J}iJx <a-K>^<c-r>x\)<ret>
+                # Insert closing ')'.
+                execute-keys -draft o<c-r>x)<esc>
+                # Delete trailing ')' on the line below the '('.
+                execute-keys -draft xs\)\h*\}?\h*$<ret>d
+            ]
+        ]
+    ]
+]
+
+§
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