middleclick-autoscroll 1.0.0
Middle-click autoscroll for every Chromium-based application on the system: Electron and CEF applications, Chromium-based browsers, Flatpaks, Spotify and Steam, plus anything installed later. The flag goes into an Arch wrapper's <name>-flags.conf where one exists, and into a shadowing desktop entry where it does not. Steam gets its web helper script patched and -noverifyfiles on its launcher, because it restores its own files otherwise. Every change is recorded so it can be taken back exactly.
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# shellcheck shell=bash
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#
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# Deciding what happens to each application, and doing it.
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#
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# The routing lives in mca_route and is used twice: once by mca_apply to patch
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# and once by the applications screen to show what would happen. Keeping it in
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# one function is what makes that screen trustworthy - it is not a description
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# of the behaviour, it is the behaviour.
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MCA_CHANGES=0
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MCA_TOUCHED=()
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MCA_ROUTES=()
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# mca_route <kind> <id> <program>
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# What happens to one application, left in MCA_ROUTE:
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# flags - the launcher reads a flag file; write it there
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# desktop - no flag file; shadow or edit the desktop entry
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# steam - Steam's own two-part treatment
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# unknown - cannot tell what engine this is (an AppImage), so nothing is done
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# off - detected, but switched off
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#
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# Assigns rather than prints so the memo inside mca_has_flags_file survives:
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# from inside a command substitution it would be filled in a subshell and
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# thrown away, which is the whole point of having it.
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MCA_ROUTE=''
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mca_route() {
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local kind="$1" id="$2" prog="$3"
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if [[ $kind == steam ]]; then
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if mca_config_list_has Skip "$id" || [[ $CFG_STEAM != yes ]]; then
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MCA_ROUTE=off
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else
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MCA_ROUTE=steam
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fi
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return
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fi
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if ! mca_kind_wanted "$kind" "$id"; then
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[[ $kind == unknown ]] && MCA_ROUTE=unknown || MCA_ROUTE=off
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return
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fi
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# A Flatpak has its own copy of everything and none of the host's wrappers,
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# so the desktop entry is the only way in.
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if [[ $kind == flatpak ]]; then
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MCA_ROUTE=desktop
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return
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fi
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if mca_has_flags_file "$prog"; then
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MCA_ROUTE=flags
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else
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MCA_ROUTE=desktop
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fi
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}
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# mca_apply
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# Brings everything into line with the current settings. Safe to run as often
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# as it likes to be - it writes only what differs, which is what keeps the
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# watcher from chasing its own changes.
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mca_apply() {
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local i id file prog kind route steam_done=0
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MCA_CHANGES=0
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MCA_TOUCHED=()
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MCA_ROUTES=()
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MCA_N_ON=0; MCA_N_OFF=0; MCA_N_UNKNOWN=0
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mca_config_load
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mca_scan
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for i in "${!MCA_IDS[@]}"; do
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id="${MCA_IDS[i]}"
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file="${MCA_FILES[i]}"
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prog="${MCA_PROGS[i]}"
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kind="${MCA_KINDS[i]}"
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mca_route "$kind" "$id" "$prog"
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route="$MCA_ROUTE"
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MCA_ROUTES[i]="$route"
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case "$route" in
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unknown) MCA_N_UNKNOWN=$(( MCA_N_UNKNOWN + 1 )) ;;
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off) MCA_N_OFF=$(( MCA_N_OFF + 1 )) ;;
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*) MCA_N_ON=$(( MCA_N_ON + 1 )) ;;
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esac
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case "$route" in
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flags)
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mca_flags_apply "$prog" || mca_desktop_apply "$id" "$file"
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;;
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desktop)
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mca_desktop_apply "$id" "$file"
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;;
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steam)
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mca_steam_desktop_apply "$id" "$file"
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if (( ! steam_done )); then
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mca_steam_apply
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steam_done=1
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fi
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;;
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esac
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done
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# Steam is worth patching even when its desktop entry is missing - a user
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# who starts it from a script or a game launcher still gets the interface.
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if [[ $CFG_STEAM == yes ]] && (( ! steam_done )) && mca_steam_installed; then
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mca_steam_apply
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fi
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[[ $CFG_AUTOSTART == yes ]] && mca_autostart_apply
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[[ $CFG_SPOTIFY == yes ]] && mca_spotify_apply
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if (( MCA_CHANGES )) && mca_have update-desktop-database; then
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update-desktop-database "$MCA_APPDIR" 2>/dev/null || true
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fi
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mca_state_write last_apply "$(date +%s)"
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mca_state_write covered "${#MCA_TOUCHED[@]}"
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return 0
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}
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# mca_revert
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# Undoes every recorded change and forgets them.
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mca_revert() {
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MCA_CHANGES=0
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mca_revert_all
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if (( MCA_CHANGES )) && mca_have update-desktop-database; then
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update-desktop-database "$MCA_APPDIR" 2>/dev/null || true
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fi
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mca_state_write covered 0
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return 0
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}
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# ---------------------------------------------------------------------------
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# The watcher
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# ---------------------------------------------------------------------------
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# A systemd user path unit watching every directory a desktop entry can appear
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# in. That covers a package installed with pacman, a Flatpak, an AppImage
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# registered by hand and a Steam client update, without a hook per package
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# manager.
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MCA_UNIT_PATH="middleclick-autoscroll.path"
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MCA_UNIT_SERVICE="middleclick-autoscroll.service"
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mca_watch_available() {
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mca_have systemctl && [[ -n ${XDG_RUNTIME_DIR:-} || -S "/run/user/$(id -u)/bus" ]]
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}
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mca_watch_enabled() {
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mca_watch_available || return 1
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systemctl --user is-enabled --quiet "$MCA_UNIT_PATH" 2>/dev/null
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}
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mca_watch_enable() {
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mca_watch_available || return 1
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systemctl --user enable --now "$MCA_UNIT_PATH" > /dev/null 2>&1 || return 1
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systemctl --user enable "$MCA_UNIT_SERVICE" > /dev/null 2>&1 || true
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return 0
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}
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mca_watch_disable() {
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mca_watch_available || return 0
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systemctl --user disable --now "$MCA_UNIT_PATH" > /dev/null 2>&1 || true
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systemctl --user disable "$MCA_UNIT_SERVICE" > /dev/null 2>&1 || true
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return 0
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}
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# ---------------------------------------------------------------------------
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# Reporting
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# ---------------------------------------------------------------------------
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# mca_count_routes
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# Fills MCA_N_ON / MCA_N_OFF / MCA_N_UNKNOWN from a scan, without writing
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# anything. Used by the status block and the menu header.
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MCA_N_ON=0
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MCA_N_OFF=0
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MCA_N_UNKNOWN=0
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mca_count_routes() {
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local i route
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MCA_N_ON=0; MCA_N_OFF=0; MCA_N_UNKNOWN=0
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MCA_ROUTES=()
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for i in "${!MCA_IDS[@]}"; do
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mca_route "${MCA_KINDS[i]}" "${MCA_IDS[i]}" "${MCA_PROGS[i]}"
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route="$MCA_ROUTE"
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MCA_ROUTES[i]="$route"
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case "$route" in
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unknown) MCA_N_UNKNOWN=$(( MCA_N_UNKNOWN + 1 )) ;;
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off) MCA_N_OFF=$(( MCA_N_OFF + 1 )) ;;
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*) MCA_N_ON=$(( MCA_N_ON + 1 )) ;;
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esac
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done
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}
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# mca_route_label <route>
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mca_route_label() {
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case "$1" in
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flags) mca_msg "flag file" ;;
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desktop) mca_msg "launcher" ;;
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steam) mca_msg "Steam" ;;
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unknown) mca_msg "cannot tell" ;;
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*) mca_msg "off" ;;
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esac
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printf '\n'
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}
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