Rebase to flake parts #6

2026-05-08 19:05:10 -03:00
parent d51f41566c
commit 1015cf4577
18 changed files with 934 additions and 35 deletions
@@ -0,0 +1,22 @@
+# DDC/CI helper + i2c-dev + ddcutil (implementation under `package/`).
+{ ... }: {
+  flake.nixosModules.systemMonitorInput =
+    { config, lib, pkgs, ... }:
+    let
+      cfg = config.chiasson.system.monitorInput;
+      monitorInputPkg = pkgs.callPackage ./package { };
+    in
+    {
+      options.chiasson.system.monitorInput.enable = lib.mkEnableOption ''
+        `i2c-dev`, ddcutil, and `monitor-input` for DDC/CI input switching.
+      '';
+
+      config = lib.mkIf cfg.enable {
+        boot.kernelModules = [ "i2c-dev" ];
+        environment.systemPackages = [
+          pkgs.ddcutil
+          monitorInputPkg
+        ];
+      };
+    };
+}
@@ -0,0 +1,12 @@
+# DDC/CI monitor input control: list displays, get/set input by bus or name.
+{ pkgs }:
+let
+  script = builtins.readFile ./monitor-input.sh;
+  unwrapped = pkgs.writeShellScriptBin "monitor-input" script;
+in
+pkgs.runCommand "monitor-input" { nativeBuildInputs = [ pkgs.makeWrapper ]; } ''
+  mkdir -p $out/bin
+  cp ${unwrapped}/bin/monitor-input $out/bin/monitor-input
+  chmod +x $out/bin/monitor-input
+  wrapProgram $out/bin/monitor-input --prefix PATH : ${pkgs.lib.makeBinPath [ pkgs.ddcutil ]}
+''
@@ -0,0 +1,93 @@
+#!/usr/bin/env bash
+set -euo pipefail
+VCP_INPUT=0x60
+CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/monitor-input"
+CACHE_FILE="$CACHE_DIR/displays"
+CACHE_TTL=60
+
+# Output one line per DDC-capable display: BUS	MODEL	MFG (from ddcutil detect, cached for CACHE_TTL seconds).
+list_ddc_displays() {
+  mkdir -p "$CACHE_DIR"
+  local now ts
+  now=$(date +%s)
+  ts=$(stat -c %Y "$CACHE_FILE" 2>/dev/null || echo 0)
+  if [[ -s "$CACHE_FILE" ]] && (( ts + CACHE_TTL > now )); then
+    cat "$CACHE_FILE"
+    return
+  fi
+  ddcutil detect 2>/dev/null | awk '
+    /^Display [0-9]+$/ { bus=""; model=""; mfg=""; next }
+    /^Invalid display|^   DDC communication failed/ { next }
+    /^   I2C bus:/ { if (match($0, /i2c-[0-9]+/)) bus=substr($0, RSTART+4, RLENGTH-4); next }
+    /^      Mfg id:[[:space:]]+/ { mfg=substr($0, index($0,":")+1); gsub(/^[[:space:]]+/, "", mfg); next }
+    /^      Model:[[:space:]]+/ { model=substr($0, index($0,":")+1); gsub(/^[[:space:]]+/, "", model); next }
+    /^   VCP version:/ { if (bus != "") print bus "\t" model "\t" mfg }
+  ' | tee "$CACHE_FILE"
+}
+
+# Resolve DISP (bus number or name substring) to bus number. Exits 1 if not found or ambiguous.
+# When DISP is numeric, use it directly (no slow ddcutil detect).
+resolve_display() {
+  local disp="$1"
+  if [[ "$disp" =~ ^[0-9]+$ ]]; then
+    echo "$disp"
+    return 0
+  fi
+  local bus r
+  bus=$(list_ddc_displays | awk -v disp="$disp" '
+    BEGIN { d = tolower(disp); found = 0 }
+    {
+      if (index(tolower($2), d) || index(tolower($3), d)) {
+        if (found) exit 2
+        found = $1
+      }
+    }
+    END { if (found) print found; exit (found ? 0 : 1) }
+  ')
+  r=$?
+  [[ $r -eq 2 ]] && { echo "monitor-input: '$disp' matches multiple displays (use bus number)" >&2; return 1; }
+  [[ $r -eq 0 && -n "$bus" ]] || { echo "monitor-input: no DDC display matching '$disp'" >&2; return 1; }
+  echo "$bus"
+}
+
+# Map input name to VCP 0x60 value (common assignments; use hex for others).
+input_to_hex() {
+  case "$(echo "$1" | tr '[:upper:]' '[:lower:]')" in
+    dp|dp1)   echo "0x0f" ;;
+    dp2)      echo "0x10" ;;
+    hdmi|hdmi1) echo "0x11" ;;
+    hdmi2)    echo "0x12" ;;
+    0x*)      echo "$1" ;;
+    *)       echo "monitor-input: unknown input '$1' (use dp, dp1, dp2, hdmi, hdmi1, hdmi2, or 0xNN)" >&2; return 1 ;;
+  esac
+}
+
+case "${1:-}" in
+  list)
+    echo "Bus	Model	Mfg"
+    list_ddc_displays
+    ;;
+  *)
+    [[ -n "${1:-}" ]] || { echo "Usage: monitor-input list | monitor-input <display> get|set [input]" >&2; exit 1; }
+    case "${2:-}" in
+      get)
+        bus=$(resolve_display "$1") || exit 1
+        exec ddcutil --bus "$bus" getvcp "$VCP_INPUT"
+        ;;
+      set)
+        [[ -n "${3:-}" ]] || { echo "Usage: monitor-input <display> set <input>" >&2; exit 1; }
+        bus=$(resolve_display "$1") || exit 1
+        hex=$(input_to_hex "$3") || exit 1
+        exec ddcutil --bus "$bus" setvcp "$VCP_INPUT" "$hex"
+        ;;
+      *)
+        echo "Usage: monitor-input list" >&2
+        echo "       monitor-input <display> get" >&2
+        echo "       monitor-input <display> set <input>" >&2
+        echo "  display: bus number (e.g. 23) or name match (e.g. benq, zowie, lg, 34GL750)" >&2
+        echo "  input:   dp, dp1, dp2, hdmi, hdmi1, hdmi2, or 0xNN" >&2
+        exit 1
+        ;;
+    esac
+    ;;
+esac