Greyson Parrelli
738cead680
Uses libghostty-vt (the API Ghostty documents for external embedders) for the terminal core. Ghostty's other C API, ghostty.h, exposes a full terminal surface but only supports macOS and iOS platform tags, so it cannot be embedded on Linux. We supply the layers libghostty-vt deliberately leaves out: PTY and process management, a Cairo/Pango cell renderer, and a GTK4/libadwaita UI with a Zen-style vertical tab sidebar. Nix pins the whole toolchain (Zig 0.16 via zig-overlay, GTK 4.22, libadwaita) so no host setup is needed.
118 lines
3.7 KiB
Bash
Executable File
118 lines
3.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Run vtabs inside a throwaway headless Sway and screenshot it.
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#
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# This keeps UI checks out of the developer's real Wayland session: nothing
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# pops up on screen, and it works even while the session is locked.
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#
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# Usage: ./shot.sh OUT.png ["keys to type"] [settle-seconds]
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set -u
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cd "$(dirname "$0")"
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OUT="${1:-/tmp/vtabs-shot.png}"
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KEYS="${2:-}"
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SETTLE="${3:-2}"
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RUNDIR="$(mktemp -d)"
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trap 'rm -rf "$RUNDIR"' EXIT
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cat > "$RUNDIR/sway.conf" <<CONF
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output HEADLESS-1 resolution 1200x800
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default_border none
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exec "'$RUNDIR/launch.sh' >'$RUNDIR/app.log' 2>&1"
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CONF
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# The nix dev shell exports bash functions into the environment. Any /bin/sh
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# the terminal's child spawns tries to import them and spews parse errors that
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# have nothing to do with vtabs, so drop them just before exec.
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cat > "$RUNDIR/launch.sh" <<'LAUNCH'
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#!/usr/bin/env bash
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while read -r fn; do unset -f "$fn" 2>/dev/null; done < <(declare -Fx | awk '{print $3}')
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exec "$VTABS_BIN"
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LAUNCH
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chmod +x "$RUNDIR/launch.sh"
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export VTABS_BIN="$PWD/zig-out/bin/vtabs"
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export WLR_BACKENDS=headless
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export WLR_LIBINPUT_NO_DEVICES=1
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# No GPU is available to a headless compositor here, so force software
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# rendering on both the compositor and GTK sides.
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export WLR_RENDERER=pixman
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export LIBGL_ALWAYS_SOFTWARE=1
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export GSK_RENDERER=cairo
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export XDG_RUNTIME_DIR="${XDG_RUNTIME_DIR:-/run/user/$(id -u)}"
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# The nix dev shell points SHELL at a minimal bash (no readline, no
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# programmable completion), which makes screenshots look broken for reasons
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# that have nothing to do with vtabs. Use the system shell instead.
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export SHELL="${VTABS_SHOT_SHELL:-/bin/bash}"
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export SWAYSOCK="$RUNDIR/sway.sock"
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# Don't let the app fall back to the real session.
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unset DISPLAY
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unset WAYLAND_DISPLAY
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for sock in "$XDG_RUNTIME_DIR"/wayland-*; do
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[ -S "$sock" ] && basename "$sock"
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done > "$RUNDIR/pre-sockets" 2>/dev/null || true
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sway -c "$RUNDIR/sway.conf" >"$RUNDIR/sway.log" 2>&1 &
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SWAY_PID=$!
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# Wait for the compositor socket before talking to it.
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for _ in $(seq 1 50); do
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[ -S "$SWAYSOCK" ] && break
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sleep 0.2
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done
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# Sway picks its own socket name, so discover it by diffing the sockets in
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# XDG_RUNTIME_DIR against the ones that existed before we started.
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DISPLAY_NAME=""
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for _ in $(seq 1 50); do
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for sock in "$XDG_RUNTIME_DIR"/wayland-*; do
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case "$sock" in *.lock) continue;; esac
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[ -S "$sock" ] || continue
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name="$(basename "$sock")"
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grep -qx "$name" "$RUNDIR/pre-sockets" && continue
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DISPLAY_NAME="$name"
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break
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done
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[ -n "$DISPLAY_NAME" ] && break
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sleep 0.2
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done
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if [ -z "$DISPLAY_NAME" ]; then
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echo "could not determine wayland display" >&2
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cat "$RUNDIR/sway.log" >&2
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exit 1
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fi
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export WAYLAND_DISPLAY="$DISPLAY_NAME"
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sleep "$SETTLE"
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if [ -n "$KEYS" ]; then
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# wtype drops the first keystroke of every invocation while the compositor
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# takes up its freshly uploaded keymap, so burn one on a harmless key.
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wtype -k Shift_L 2>/dev/null || true
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sleep 0.3
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wtype "$KEYS" 2>/dev/null || true
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sleep 1.5
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fi
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if [ -n "${VTABS_SHOT_DEBUG:-}" ]; then
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echo "--- swaymsg get_tree (apps) ---" >&2
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swaymsg -t get_tree 2>&1 | grep -E '"(app_id|name|pid)"' | head -30 >&2
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echo "--- sway log ---" >&2
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cat "$RUNDIR/sway.log" >&2
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echo "--- app log ---" >&2
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cat "$RUNDIR/app.log" >&2 2>/dev/null || echo "(no app log)" >&2
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fi
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if ! grim -o HEADLESS-1 "$OUT"; then
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echo "grim -o failed, trying full capture" >&2
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grim "$OUT" || echo "grim failed entirely" >&2
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fi
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swaymsg exit >/dev/null 2>&1 || kill "$SWAY_PID" 2>/dev/null
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wait "$SWAY_PID" 2>/dev/null
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echo "wrote $OUT"
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# Surface app-side errors, which sway captures on its stdout.
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grep -iE "error|warn|panic|segfault" "$RUNDIR/sway.log" | grep -v "portal" | head -20 || true
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