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)

rc/tools/clang.kak

@@ -36,16 +36,17 @@ define-command -params ..1 \
         # position and a buffer timestamp, only valid completions should be
         # displayed.
         ((
+            trap - INT QUIT
             until [ -f ${dir}/buf ]; do :; done # wait for the buffer to be written
 
             if [ -n "$kak_opt_clang_directory" ]; then
                 cd "$kak_opt_clang_directory"
             fi
             case ${kak_opt_filetype} in
-                c) ft=c ;;
-                cpp) ft=c++ ;;
-                obj-c) ft=objective-c ;;
-                *) ft=c++ ;;
+                (c) ft=c ;;
+                (cpp) ft=c++ ;;
+                (obj-c) ft=objective-c ;;
+                (*) ft=c++ ;;
             esac
 
             if [ "$1" = "-complete" ]; then

rc/tools/ctags.kak

@@ -112,6 +112,7 @@ declare-option -docstring "path to the directory in which the tags file will be
 define-command ctags-generate -docstring 'Generate tag file asynchronously' %{
     echo -markup "{Information}launching tag generation in the background"
     nop %sh{ (
+        trap - INT QUIT
         while ! mkdir .tags.kaklock 2>/dev/null; do sleep 1; done
         trap 'rmdir .tags.kaklock' EXIT
 
@@ -128,6 +129,7 @@ define-command ctags-generate -docstring 'Generate tag file asynchronously' %{
 
 define-command ctags-update-tags -docstring 'Update tags for the given file' %{
     nop %sh{ (
+        trap - INT QUIT
         while ! mkdir .tags.kaklock 2>/dev/null; do sleep 1; done
             trap 'rmdir .tags.kaklock' EXIT
 

rc/tools/git.kak

@@ -164,7 +164,7 @@ define-command -params 1.. \
         esac
         output=$(mktemp -d "${TMPDIR:-/tmp}"/kak-git.XXXXXXXX)/fifo
         mkfifo ${output}
-        ( git "$@" > ${output} 2>&1 & ) > /dev/null 2>&1 < /dev/null
+        ( trap - INT QUIT; git "$@" > ${output} 2>&1 & ) > /dev/null 2>&1 < /dev/null
 
         printf %s "evaluate-commands -try-client '$kak_opt_docsclient' '
                   edit! -fifo ${output} *git*
@@ -283,6 +283,7 @@ define-command -params 1.. \
         echo 'map window normal <ret> %{:git blame-jump<ret>}'
         echo 'echo -markup {Information}Press <ret> to jump to blamed commit'
         (
+            trap - INT QUIT
             cd_bufdir
             printf %s "evaluate-commands -client '$kak_client' %{
                       set-option buffer=$kak_bufname git_blame_flags '$kak_timestamp'

rc/tools/go/gopls.kak

@@ -84,8 +84,8 @@ define-command -hidden -params 0 gopls-ref %{
     evaluate-commands %sh{
         dir=${kak_opt_gopls_tmp_dir}
         mkfifo "${dir}/fifo"
-        ( gopls references "${kak_buffile}:${kak_cursor_line}:${kak_cursor_column}" \
-            > "${dir}/fifo" 2> /dev/null & ) > /dev/null 2>&1 < /dev/null
+        ( { trap - INT QUIT; gopls references "${kak_buffile}:${kak_cursor_line}:${kak_cursor_column}"
+          } > "${dir}/fifo" 2> /dev/null & ) > /dev/null 2>&1 < /dev/null
         # using filetype=grep for nice hilight and <ret> mapping
         printf %s\\n "evaluate-commands -try-client '${kak_opt_toolsclient}' %{
             edit! -fifo '${dir}/fifo' *gopls-refs*

rc/tools/grep.kak

@@ -26,7 +26,7 @@ define-command -params .. -docstring %{
 
      output=$(mktemp -d "${TMPDIR:-/tmp}"/kak-grep.XXXXXXXX)/fifo
      mkfifo ${output}
-     ( ${kak_opt_grepcmd} "$@" 2>&1 | tr -d '\r' > ${output} 2>&1 & ) > /dev/null 2>&1 < /dev/null
+     ( { trap - INT QUIT; ${kak_opt_grepcmd} "$@" 2>&1 | tr -d '\r'; } > ${output} 2>&1 & ) > /dev/null 2>&1 < /dev/null
 
      printf %s\\n "evaluate-commands -try-client '$kak_opt_toolsclient' %{
                edit! -fifo ${output} *grep*

rc/tools/lint.kak

@@ -74,6 +74,7 @@ define-command \
         # but shellcheck isn't a fan.
         # shellcheck disable=SC2094
         ({ # do the parsing in the background and when ready send to the session
+        trap - INT QUIT
 
         for selpath in "$dir"/sel-*; do
             # Read in the line and column offset of this selection.

rc/tools/make.kak

@@ -14,7 +14,7 @@ define-command -params .. \
      } make %{ evaluate-commands %sh{
      output=$(mktemp -d "${TMPDIR:-/tmp}"/kak-make.XXXXXXXX)/fifo
      mkfifo ${output}
-     ( eval "${kak_opt_makecmd}" "$@" > ${output} 2>&1 & ) > /dev/null 2>&1 < /dev/null
+     ( { trap - INT QUIT; eval "${kak_opt_makecmd}" "$@"; } > ${output} 2>&1 & ) > /dev/null 2>&1 < /dev/null
 
      printf %s\\n "evaluate-commands -try-client '$kak_opt_toolsclient' %{
                edit! -fifo ${output} -scroll *make*

rc/tools/python/jedi.kak

@@ -20,6 +20,7 @@ define-command jedi-complete -docstring "Complete the current selection" %{
         dir=${kak_opt_jedi_tmp_dir}
         printf %s\\n "evaluate-commands -draft %{ edit! -fifo ${dir}/fifo *jedi-output* }"
         ((
+            trap - INT QUIT
             cd $(dirname ${kak_buffile})
 
             export PYTHONPATH="$kak_opt_jedi_python_path:$PYTHONPATH"

rc/tools/rust/racer.kak

@@ -16,6 +16,7 @@ define-command racer-complete -docstring "Complete the current selection with ra
     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 '

rc/tools/spell.kak

@@ -32,6 +32,7 @@ define-command -params ..1 -docstring %{
         printf 'eval -no-hooks write %s\n' "${kak_response_fifo}" > $kak_command_fifo
 
         {
+            trap - INT QUIT
             sed 's/^/^/' | eval "aspell --byte-offsets -a $options" 2>&1 | awk '
                 BEGIN {
                     line_num = 1