kakoune/rc/tools/rust/racer.kak
Johannes Altmanninger 7b93567bb1 Reset SIGINT handler in background processes
In a noninteractive shell, asynchronous commands ignore SIGINT and
SIGQUIT. We typically use such shells to feed fifo buffers which we
do want to cancel them on Control-C.  Make it so.

Same for SIGQUIT; that one is not typically used but I expect that
along the Kakoune server it kills any child processes that (haven't
been daemonized).

Note that for unknown reasons, Bash already doesn't ignore SIGINT in
async processes that use "eval".

Note that Dash has a bug that prevents this from working;
proposed fix is at
https://lore.kernel.org/dash/20240329153905.154792-2-aclopte@gmail.com/

(While at it balance out some parens, to help the m command)
2024-03-31 20:13:35 +11:00

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hook -once global BufSetOption filetype=rust %{
require-module racer
}
provide-module racer %{
declare-option -hidden str racer_tmp_dir
declare-option -hidden completions racer_completions
define-command racer-complete -docstring "Complete the current selection with racer" %{
evaluate-commands %sh{
dir=$(mktemp -d "${TMPDIR:-/tmp}"/kak-racer.XXXXXXXX)
printf %s\\n "set-option buffer racer_tmp_dir ${dir}"
printf %s\\n "evaluate-commands -no-hooks %{ write ${dir}/buf }"
}
evaluate-commands %sh{
dir=${kak_opt_racer_tmp_dir}
(
trap - INT QUIT
cursor="${kak_cursor_line} $((${kak_cursor_column} - 1))"
racer_data=$(racer --interface tab-text complete-with-snippet ${cursor} ${kak_buffile} ${dir}/buf)
compl=$(printf %s\\n "${racer_data}" | awk '
BEGIN { FS = "\t"; ORS = " " }
/^PREFIX/ {
column = ENVIRON["kak_cursor_column"] + $2 - $3
print ENVIRON["kak_cursor_line"] "." column "@@" ENVIRON["kak_timestamp"]
}
/^MATCH/ {
word = $2
desc = substr($9, 2, length($9) - 2)
gsub(/\|/, "\\|", desc)
gsub(/\\n/, "\n", desc)
gsub(/!/, "!!", desc)
info = $8
gsub(/\|/, "\\|", info)
candidate = word "|info -style menu %!" desc "!|" word " {MenuInfo}" info
gsub(/@/, "@@", candidate)
gsub(/~/, "~~", candidate)
print "%~" candidate "~"
}'
)
printf %s\\n "evaluate-commands -client '${kak_client}' %@ set-option 'buffer=${kak_bufname}' racer_completions ${compl%?} @" | kak -p ${kak_session}
rm -r ${dir}
) > /dev/null 2>&1 < /dev/null &
}
}
define-command racer-enable-autocomplete -docstring "Add racer completion candidates to the completer" %{
set-option window completers option=racer_completions %opt{completers}
hook window -group racer-autocomplete InsertIdle .* %{ try %{
execute-keys -draft <a-h><a-k>([\w\.]|::).\z<ret>
racer-complete
} }
alias window complete racer-complete
}
define-command racer-disable-autocomplete -docstring "Disable racer completion" %{
evaluate-commands %sh{ printf "set-option window completers %s\n" $(printf %s "${kak_opt_completers}" | sed -e "s/'option=racer_completions'//g") }
remove-hooks window racer-autocomplete
unalias window complete racer-complete
}
define-command racer-go-definition -docstring "Jump to where the rust identifier below the cursor is defined" %{
evaluate-commands %sh{
dir=$(mktemp -d "${TMPDIR:-/tmp}"/kak-racer.XXXXXXXX)
printf %s\\n "set-option buffer racer_tmp_dir ${dir}"
printf %s\\n "evaluate-commands -no-hooks %{ write ${dir}/buf }"
}
evaluate-commands %sh{
dir=${kak_opt_racer_tmp_dir}
cursor="${kak_cursor_line} $((${kak_cursor_column} - 1))"
racer_data=$(racer --interface tab-text find-definition ${cursor} "${kak_buffile}" "${dir}/buf" | head -n 1)
racer_match=$(printf %s\\n "$racer_data" | cut -f1 )
if [ "$racer_match" = "MATCH" ]; then
racer_line=$(printf %s\\n "$racer_data" | cut -f3 )
racer_column=$(printf %s\\n "$racer_data" | cut -f4 )
racer_file=$(printf %s\\n "$racer_data" | cut -f5 )
printf %s\\n "edit -existing '$racer_file' $racer_line $racer_column"
case ${racer_file} in
"${RUST_SRC_PATH}"* | "${CARGO_HOME:-$HOME/.cargo}"/registry/src/*)
printf %s\\n "set-option buffer readonly true";;
esac
else
printf %s\\n "echo -debug 'racer could not find a definition'"
fi
}
}
define-command racer-show-doc -docstring "Show the documentation about the rust identifier below the cursor" %{
evaluate-commands %sh{
dir=$(mktemp -d "${TMPDIR:-/tmp}"/kak-racer.XXXXXXXX)
printf %s\\n "set-option buffer racer_tmp_dir ${dir}"
printf %s\\n "evaluate-commands -no-hooks %{ write ${dir}/buf }"
}
evaluate-commands %sh{
dir=${kak_opt_racer_tmp_dir}
cursor="${kak_cursor_line} ${kak_cursor_column}"
racer_data=$(racer --interface tab-text complete-with-snippet ${cursor} "${kak_buffile}" "${dir}/buf" | sed -n 2p )
racer_match=$(printf %s\\n "$racer_data" | cut -f1)
if [ "$racer_match" = "MATCH" ]; then
racer_doc=$(
printf %s\\n "$racer_data" |
cut -f9 |
sed -e '
# Remove leading and trailing quotes
s/^"\(.*\)"$/\1/g
# Escape all @ so that it can be properly used in the string expansion
s/@/\\@/g
')
printf "info %%@$racer_doc@"
else
printf %s\\n "echo -debug 'racer could not find a definition'"
fi
}
}
}