94 lines
3.2 KiB
Bash
94 lines
3.2 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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VCP_INPUT=0x60
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CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/monitor-input"
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CACHE_FILE="$CACHE_DIR/displays"
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CACHE_TTL=60
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# Output one line per DDC-capable display: BUS MODEL MFG (from ddcutil detect, cached for CACHE_TTL seconds).
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list_ddc_displays() {
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mkdir -p "$CACHE_DIR"
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local now ts
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now=$(date +%s)
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ts=$(stat -c %Y "$CACHE_FILE" 2>/dev/null || echo 0)
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if [[ -s "$CACHE_FILE" ]] && (( ts + CACHE_TTL > now )); then
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cat "$CACHE_FILE"
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return
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fi
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ddcutil detect 2>/dev/null | awk '
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/^Display [0-9]+$/ { bus=""; model=""; mfg=""; next }
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/^Invalid display|^ DDC communication failed/ { next }
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/^ I2C bus:/ { if (match($0, /i2c-[0-9]+/)) bus=substr($0, RSTART+4, RLENGTH-4); next }
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/^ Mfg id:[[:space:]]+/ { mfg=substr($0, index($0,":")+1); gsub(/^[[:space:]]+/, "", mfg); next }
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/^ Model:[[:space:]]+/ { model=substr($0, index($0,":")+1); gsub(/^[[:space:]]+/, "", model); next }
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/^ VCP version:/ { if (bus != "") print bus "\t" model "\t" mfg }
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' | tee "$CACHE_FILE"
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}
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# Resolve DISP (bus number or name substring) to bus number. Exits 1 if not found or ambiguous.
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# When DISP is numeric, use it directly (no slow ddcutil detect).
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resolve_display() {
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local disp="$1"
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if [[ "$disp" =~ ^[0-9]+$ ]]; then
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echo "$disp"
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return 0
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fi
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local bus r
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bus=$(list_ddc_displays | awk -v disp="$disp" '
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BEGIN { d = tolower(disp); found = 0 }
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{
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if (index(tolower($2), d) || index(tolower($3), d)) {
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if (found) exit 2
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found = $1
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}
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}
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END { if (found) print found; exit (found ? 0 : 1) }
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')
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r=$?
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[[ $r -eq 2 ]] && { echo "monitor-input: '$disp' matches multiple displays (use bus number)" >&2; return 1; }
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[[ $r -eq 0 && -n "$bus" ]] || { echo "monitor-input: no DDC display matching '$disp'" >&2; return 1; }
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echo "$bus"
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}
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# Map input name to VCP 0x60 value (common assignments; use hex for others).
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input_to_hex() {
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case "$(echo "$1" | tr '[:upper:]' '[:lower:]')" in
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dp|dp1) echo "0x0f" ;;
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dp2) echo "0x10" ;;
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hdmi|hdmi1) echo "0x11" ;;
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hdmi2) echo "0x12" ;;
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0x*) echo "$1" ;;
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*) echo "monitor-input: unknown input '$1' (use dp, dp1, dp2, hdmi, hdmi1, hdmi2, or 0xNN)" >&2; return 1 ;;
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esac
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}
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case "${1:-}" in
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list)
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echo "Bus Model Mfg"
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list_ddc_displays
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;;
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*)
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[[ -n "${1:-}" ]] || { echo "Usage: monitor-input list | monitor-input <display> get|set [input]" >&2; exit 1; }
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case "${2:-}" in
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get)
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bus=$(resolve_display "$1") || exit 1
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exec ddcutil --bus "$bus" getvcp "$VCP_INPUT"
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;;
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set)
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[[ -n "${3:-}" ]] || { echo "Usage: monitor-input <display> set <input>" >&2; exit 1; }
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bus=$(resolve_display "$1") || exit 1
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hex=$(input_to_hex "$3") || exit 1
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exec ddcutil --bus "$bus" setvcp "$VCP_INPUT" "$hex"
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;;
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*)
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echo "Usage: monitor-input list" >&2
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echo " monitor-input <display> get" >&2
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echo " monitor-input <display> set <input>" >&2
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echo " display: bus number (e.g. 23) or name match (e.g. benq, zowie, lg, 34GL750)" >&2
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echo " input: dp, dp1, dp2, hdmi, hdmi1, hdmi2, or 0xNN" >&2
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exit 1
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;;
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esac
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;;
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esac
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