tools: Import shell-lg from halfline's os-debug-scripts
It allows interacting with gnome-shell in the same way as looking glass but does so from a terminal. This can be really useful in some situations. Imported from: https://github.com/halfline/os-debug-scripts Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3430>
This commit is contained in:
Sebastian Wick
committed by
Ray Strode
Ray Strode
parent
105abab1e4
commit
8e39015b11
283
tools/shell-lg.sh
Executable file
283
tools/shell-lg.sh
Executable file
@ -0,0 +1,283 @@
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#!/bin/bash
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PROMPT_LINES=2
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input_buffer=""
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init_terminal() {
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# Hide cursor to avoid flickering
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tput civis
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# Scroll enough for the prompt in case we're at the
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# bottom of the screen
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for i in $(seq 1 $PROMPT_LINES); do
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echo
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done
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# Move cursor to the top of the room we just made
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tput cuu $((PROMPT_LINES + 1))
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# Save cursor position
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tput sc
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# Exclude prompt from scrollable area
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tput csr 0 "$(($(tput lines) - PROMPT_LINES - 1))"
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# Changing scrollable area moves cursor, so put it back
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tput rc
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}
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restore_terminal() {
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clear_status
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clear_prompt
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tput csr 0 "$(tput lines)"
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tput rc
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tput cnorm
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}
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eval_javascript_in_gnome_shell() {
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json=$(mktemp)
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busctl call --user --json=short \
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org.gnome.Shell \
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/org/gnome/Shell \
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org.gnome.Shell \
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Eval "s" "$1" > "$json"
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result=$(jq '.data[0]' < "$json")
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output=$(jq '.data[1] | select(. != null and . != "") | try fromjson catch .' < "$json")
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rm -f "$json"
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if [ "$result" = "false" ]; then
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echo -e "\e[31m${output:1:-1}\e[0m" > /dev/stderr
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return 1
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fi
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echo "$output"
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return 0
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}
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eval_javascript_in_looking_glass() {
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# encode the text so we can side-step complicated escaping rules
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ENCODED_TEXT=$(echo -n "$1" | hexdump -v -e '/1 "%02x"')
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eval_javascript_in_gnome_shell "
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const GLib = imports.gi.GLib;
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Main.createLookingGlass();
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const results = Main.lookingGlass._resultsArea;
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Main.lookingGlass._entry.text = '${ENCODED_TEXT}'.replace(/([0-9a-fA-F]{2})/g, (_, h) => String.fromCharCode(parseInt(h, 16)));
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Main.lookingGlass._entry.clutter_text.activate();
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GLib.timeout_add(GLib.PRIORITY_DEFAULT, 125, () => {
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const index = results.get_n_children() - 1;
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if (index < 0)
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return;
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const resultsActor = results.get_children()[index];
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const output = \`\${resultsActor.get_children()[1].get_children()[0].text}\${resultsActor.get_children()[1].get_children()[1].get_children()[0].text}\`;
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Main.lookingGlass._lastEncodedResult = output.split('').map(char => char.charCodeAt(0).toString(16).padStart(2, '0')).join('');
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});
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" > /dev/null
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if [ $? -ne 0 ]; then
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return
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fi
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sleep .250
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OUTPUT=$(echo -e $(eval_javascript_in_gnome_shell 'Main.lookingGlass._lastEncodedResult;' | sed 's/\([[:xdigit:]][[:xdigit:]]\)/\\x\1/g'))
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if [ -z "$OUTPUT" ]; then
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echo -e "\e[31mCould not fetch result from call\e[0m" > /dev/stderr
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return
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fi
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eval_javascript_in_gnome_shell "delete Main.lookingGlass._lastEncodedResult;" > /dev/null
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echo ">>> $1"
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echo "${OUTPUT}"
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}
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jump_to_prompt() {
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# Move to the bottom of the terminal
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tput cup $(($(tput lines) - PROMPT_LINES)) 0
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}
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clear_prompt() {
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jump_to_prompt
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tput el
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}
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jump_to_status() {
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# Move to just below the prompt
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tput cup $(($(tput lines) - PROMPT_LINES + 1)) 0
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}
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clear_status() {
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jump_to_status
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tput el
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}
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print_status_line() {
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jump_to_status
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echo -ne "Type quit to exit, ^G to inspect, ^L to clear screen"
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tput rc
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}
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clear_screen() {
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clear
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ask_user_for_input
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}
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ask_user_for_input() {
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# Save cursor position
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tput sc
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clear_prompt
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tput cnorm
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read -i "$READLINE_LINE" -p ">>> " -re input_buffer
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STATUS="$?"
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tput civis
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[ $STATUS != 0 ] && exit
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if [ "$input_buffer" = "quit" -o "$input_buffer" = "q" -o "$input_buffer" = "exit" ]; then
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exit
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fi
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# Save input to history
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history -s "$input_buffer"
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# Move cursor back to saved position before output
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tput rc
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}
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quit_message() {
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print_status_line
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ask_user_for_input
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}
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load_history() {
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while IFS= read -r line; do
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history -s "$line"
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done < <(eval_javascript_in_gnome_shell 'Main.lookingGlass._history._history.join("\n");' | jq -r '. | select(. != null and . != "") | tostring')
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}
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check_for_unsafe_mode() {
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unsafe_mode=$(eval_javascript_in_gnome_shell 'global.context.unsafe_mode')
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if [ "$unsafe_mode" != "true" ]; then
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echo -e "Please enable unsafe-mode in the Flags tab of looking glass." > /dev/stderr
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exit
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fi
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}
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eval_autocomplete_javascript() {
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ENCODED_TEXT=$(echo -n "$1" | hexdump -v -e '/1 "%02x"')
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OUTPUT=$(eval_javascript_in_gnome_shell '
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const AsyncFunction = async function () {}.constructor;
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const command = `
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const JsParse = await import("resource:///org/gnome/shell/misc/jsParse.js");
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function getGlobalState() {
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const keywords = ["true", "false", "null", "new"];
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const windowProperties = Object.getOwnPropertyNames(globalThis).filter(
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a => a.charAt(0) !== "_");
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const headerProperties = JsParse.getDeclaredConstants(commandHeader);
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return keywords.concat(windowProperties).concat(headerProperties);
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}
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const commandHeader = '"'"'const {Clutter, Gio, GLib, GObject, Meta, Shell, St} = imports.gi; const Main = await import("resource:///org/gnome/shell/ui/main.js"); const inspect = Main.lookingGlass.inspect.bind(Main.lookingGlass); const it = Main.lookingGlass.getIt(); const r = Main.lookingGlass.getResult.bind(Main.lookingGlass);'"'"';
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const text="'${ENCODED_TEXT}'".replace(/([0-9a-fA-F]{2})/g, (_, h) => String.fromCharCode(parseInt(h, 16)));
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const completions = await JsParse.getCompletions(text, commandHeader, getGlobalState());
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return {
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"completions": completions[0],
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"attrHead": completions[1]
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};`;
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AsyncFunction(command)();
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')
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if [ $? = 1 ]; then
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echo fail
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fi
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echo "$OUTPUT"
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}
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autocomplete() {
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RESULT="$(eval_autocomplete_javascript "$READLINE_LINE")"
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COMPLETIONS="$(echo "$RESULT" | jq '.completions[]' | sed 's/\"//g')"
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ATTR_HEAD=$(echo "$RESULT" | jq '.attrHead' | sed 's/\"//g')
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N_COMPLETIONS=$(echo "$COMPLETIONS" | wc -w)
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if [ $N_COMPLETIONS = 0 ]; then
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return
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elif [ $N_COMPLETIONS = 1 ]; then
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TO_ADD=$(echo $COMPLETIONS | sed s/$ATTR_HEAD//)
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READLINE_LINE+="$TO_ADD"
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(( READLINE_POINT += $(echo "$TO_ADD" | wc -c) ))
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else
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tput rc
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echo
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echo "$COMPLETIONS" | pr -T -2 -o 4
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ask_user_for_input
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fi
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}
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inspect() {
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eval_javascript_in_gnome_shell '
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const AsyncFunction = async function () {}.constructor;
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delete Main.lookingGlass._lastInspection;
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const command = `
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const Main = await import("resource:///org/gnome/shell/ui/main.js");
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const LookingGlass = await import("resource:///org/gnome/shell/ui/lookingGlass.js");
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Main.lookingGlass._inspector = new LookingGlass.Inspector(Main.lookingGlass);
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const inspector = Main.lookingGlass._inspector;
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inspector.connectObject("target", (i, obj, stageX, stageY) => {
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let command = "inspect(" + Math.round(stageX) + ", " + Math.round(stageY) + ")";
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Main.lookingGlass._lastInspection = command;
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},
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"closed", () => {
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delete Main.lookingGlass._inspector;
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});
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`;
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AsyncFunction(command)();
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'
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while sleep .250; do
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finished=$(eval_javascript_in_gnome_shell 'Main.lookingGlass._inspector? false : true')
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last_inspection=$(eval_javascript_in_gnome_shell 'Main.lookingGlass._lastInspection' | jq -r)
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[ "$finished" = "true" ] && break
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[ -n "$last_inspection" ] && break
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done
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tput rc
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[ -n "$last_inspection" ] && eval_javascript_in_looking_glass "$last_inspection"
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eval_javascript_in_gnome_shell 'delete Main.lookingGlass._lastInspection; Main.lookingGlass.setBorderPaintTarget(null);' > /dev/null
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ask_user_for_input
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}
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main_loop() {
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bind -x '"\a"':inspect 2> /dev/null
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bind -x '"\t"':autocomplete 2> /dev/null
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bind -x '"\f"':clear_screen 2> /dev/null
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while true; do
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ask_user_for_input
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eval_javascript_in_looking_glass "$input_buffer"
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done
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}
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check_for_unsafe_mode
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trap 'quit_message' SIGINT
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trap restore_terminal EXIT
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init_terminal
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load_history
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print_status_line
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main_loop
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restore_terminal
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