kakoune/rc/extra/modeline.kak

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##
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## modeline.kak by lenormf
##
## Currently supported modeline format: vim
## Also supports kakoune options with a 'kak' or 'kakoune' prefix
## Only a few options are supported, in order to prevent the
## buffers from poking around the configuration too much
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# Amount of additional lines that will be checked at the beginning
# and the end of the buffer
decl int modelines 5
def -hidden modeline-parse-impl %{
%sh{
# Translate a vim option into the corresponding kakoune one
translate_opt_vim() {
readonly key="$1"
readonly value="$2"
tr=""
case "${key}" in
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so|scrolloff) tr="scrolloff ${value},${kak_opt_scrolloff##*,}";;
siso|sidescrolloff) tr="scrolloff ${kak_opt_scrolloff%%,*},${value}";;
ts|tabstop) tr="tabstop ${value}";;
sw|shiftwidth) tr="indentwidth ${value}";;
tw|textwidth) tr="autowrap_column ${value}";;
ff|fileformat)
case "${value}" in
unix) tr="eolformat lf";;
dos) tr="eolformat crlf";;
*) printf %s\\n "echo -debug 'Unsupported file format: ${value}'";;
esac
;;
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ft|filetype) tr="filetype ${value}";;
bomb) tr="BOM utf8";;
nobomb) tr="BOM none";;
*) printf %s\\n "echo -debug 'Unsupported vim variable: ${key}'";;
esac
[ -n "${tr}" ] && printf %s\\n "set buffer ${tr}"
}
# Pass a few whitelisted options to kakoune directly
translate_opt_kakoune() {
readonly key="$1"
readonly value="$2"
case "${key}" in
scrolloff|tabstop|indentwidth|autowrap_column|eolformat|filetype|BOM);;
*) printf %s\\n "echo -debug 'Unsupported kakoune variable: ${key}'"
return;;
esac
printf %s\\n "set buffer ${key} ${value}"
}
case "${kak_selection}" in
*vi:*|*vim:*) type_selection="vim";;
*kak:*|*kakoune:*) type_selection="kakoune";;
*) echo "echo -debug Unsupported modeline format";;
esac
[ -n "${type_selection}" ] || exit 1
# The following subshell will keep the actual options of the modeline, and strip:
# - the text that leads the first option, according to the official vim modeline format
# - the trailing text after the last option, and an optional ':' sign before it
# It will also convert the ':' seperators beween the option=value pairs
# More info: http://vimdoc.sourceforge.net/htmldoc/options.html#modeline
printf %s "${kak_selection}" | sed \
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-e 's/^[^:]\{1,\}://' \
-e 's/[ \t]*set\{0,1\}[ \t]//' \
-e 's/:[^a-zA-Z0-9_=-]*$//' \
-e 's/:/ /g' \
| tr ' ' '\n' \
| while read -r option; do
name_option="${option%%=*}"
value_option="${option#*=}"
[ -z "${option}" ] && continue
case "${type_selection}" in
vim) tr=$(translate_opt_vim "${name_option}" "${value_option}");;
kakoune) tr=$(translate_opt_kakoune "${name_option}" "${value_option}");;
esac
[ -n "${tr}" ] && printf %s\\n "${tr}"
done
}
}
# Add the following function to a hook on BufOpenFile to automatically parse modelines
# Select the first and last `modelines` lines in the buffer, only keep modelines
def modeline-parse -docstring "Read and interpret vi-format modelines at the beginning/end of the buffer" %{
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try %{ eval -draft %{
exec \%s\`|.\'<ret> %opt{modelines}k <a-x> %opt{modelines}X \
s^[^\s]+?\s(vim?|kak(oune)?):\s?[^\n]+<ret> <a-x>
eval -draft -itersel modeline-parse-impl
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} }
}