home/rc/base/golang.kak

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# https://golang.org/
#
# Detection
# ‾‾‾‾‾‾‾‾‾
hook global BufCreate .*\.go %{
set buffer mimetype ""
set buffer filetype golang
}
# Highlighters
# ‾‾‾‾‾‾‾‾‾‾‾‾
addhl -group / regions -default code golang \
back_string '`' '`' '' \
double_string '"' (?<!\\)(\\\\)*" '' \
single_string "'" (?<!\\)(\\\\)*' '' \
comment /\* \*/ '' \
comment '//' $ ''
addhl -group /golang/back_string fill string
addhl -group /golang/double_string fill string
addhl -group /golang/single_string fill string
addhl -group /golang/comment fill comment
addhl -group /golang/code regex %{-?([0-9]*\.(?!0[xX]))?\<([0-9]+|0[xX][0-9a-fA-F]+)\.?([eE][+-]?[0-9]+)?i?\>} 0:value
%sh{
# Grammar
keywords="break|default|defer|else|fallthrough|for|func|go|goto|if|import"
keywords="${keywords}|interface|make|new|package|range|return|select|case|switch|type|continue"
attributes="const"
types="bool|byte|chan|complex128|complex64|float32|float64|int|int16|int32"
types="${types}|int64|int8|interface|intptr|map|rune|string|struct|uint|uint16|uint32|uint64|uint8"
values="false|true|nil"
# Add the language's grammar to the static completion list
sed 's,|,:,g' <<< "hook global WinSetOption filetype=golang %{
set window static_words '${keywords}'
set -add window static_words '${attributes}'
set -add window static_words '${types}'
set -add window static_words '${values}'
}"
# Highlight keywords
echo "
addhl -group /golang/code regex \<(${keywords})\> 0:keyword
addhl -group /golang/code regex \<(${attributes})\> 0:attribute
addhl -group /golang/code regex \<(${types})\> 0:type
addhl -group /golang/code regex \<(${values})\> 0:value
"
}
# Commands
# ‾‾‾‾‾‾‾‾
def -hidden _golang-indent-on-new-line %~
eval -draft -itersel %=
# preserve previous line indent
try %{ exec -draft \;K<a-&> }
# indent after lines ending with { or (
try %[ exec -draft k<a-x> <a-k> [{(]\h*$ <ret> j<a-gt> ]
# cleanup trailing white spaces on the previous line
try %{ exec -draft k<a-x> s \h+$ <ret>d }
# align to opening paren of previous line
try %{ exec -draft [( <a-k> \`\([^\n]+\n[^\n]*\n?\' <ret> s \`\(\h*.|.\' <ret> '<a-;>' & }
# copy // comments prefix
try %{ exec -draft \;<c-s>k<a-x> s ^\h*\K/{2,} <ret> y<c-o><c-o>P<esc> }
# indent after a switch's case/default statements
try %[ exec -draft k<a-x> <a-k> ^\h*(case|default).*:$ <ret> j<a-gt> ]
# indent after if|else|while|for
try %[ exec -draft \;<a-F>)MB <a-k> \`(if|else|while|for)\h*\(.*\)\h*\n\h*\n?\' <ret> s \`|.\' <ret> 1<a-&>1<a-space><a-gt> ]
=
~
def -hidden _golang-indent-on-opening-curly-brace %[
# align indent with opening paren when { is entered on a new line after the closing paren
try %[ exec -draft -itersel h<a-F>)M <a-k> \`\(.*\)\h*\n\h*\{\' <ret> s \`|.\' <ret> 1<a-&> ]
]
def -hidden _golang-indent-on-closing-curly-brace %[
# align to opening curly brace when alone on a line
try %[ exec -itersel -draft <a-h><a-k>^\h+\}$<ret>hms\`|.\'<ret>1<a-&> ]
]
# Initialization
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
hook global WinSetOption filetype=golang %{
addhl ref golang
# cleanup trailing whitespaces when exiting insert mode
hook window InsertEnd .* -group golang-hooks %{ try %{ exec -draft <a-x>s^\h+$<ret>d } }
hook window InsertChar \n -group golang-indent _golang-indent-on-new-line
hook window InsertChar \{ -group golang-indent _golang-indent-on-opening-curly-brace
hook window InsertChar \} -group golang-indent _golang-indent-on-closing-curly-brace
set window formatcmd "gofmt"
}
hook global WinSetOption filetype=(?!golang).* %{
rmhl golang
rmhooks window golang-hooks
rmhooks window golang-indent
}