swadhin / de-omarchy public
/ de-omarchy / bin / omarchy-brightness-display-ddc
swadhinbiswas Initial de-omarchy: Omarchy UI layer for Arch-based distros · 8/22/2026
9f393b2
169 lines · 4.2 KB
Raw Download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
#!/bin/bash

# omarchy:summary=Show or adjust DDC/CI display brightness for a Hyprland monitor.
# omarchy:args=<monitor> [+N%|N%-|N%]
# omarchy:examples=omarchy-brightness-display-ddc DP-1 | omarchy-brightness-display-ddc DP-1 50%

monitor="${1:-}"
step="${2:-}"

[[ -n $monitor ]] || exit 1

cache_dir="${XDG_RUNTIME_DIR:-/tmp}/omarchy-brightness-display-ddc"
cache_name="${monitor//[^[:alnum:]_.-]/_}"
cache_file="$cache_dir/$cache_name.bus"
unavailable_cache_seconds=60
range_cache_seconds=10

cache_unavailable() {
  mkdir -p "$cache_dir" 2>/dev/null || true
  printf 'unavailable %s\n' "$(date +%s)" >"$cache_file" 2>/dev/null || true
}

detect_bus() {
  ddcutil --skip-ddc-checks detect --brief 2>/dev/null | awk -v monitor="$monitor" '
    /I2C bus:/ {
      bus = $NF
      sub(/^.*\/i2c-/, "", bus)
    }

    /DRM connector:/ {
      connector = $NF
      sub(/^card[0-9]+-/, "", connector)
      if (connector == monitor && bus != "") {
        print bus
        exit
      }
      bus = ""
    }
  '
}

find_bus() {
  local bus=""
  local cached_value=""
  local now=0

  if [[ -r $cache_file ]]; then
    read -r bus cached_value <"$cache_file" || true
  fi

  if [[ $bus == "unavailable" ]]; then
    now=$(date +%s)
    if [[ $cached_value =~ ^[0-9]+$ ]] && (( now - cached_value < unavailable_cache_seconds )); then
      return 1
    fi
    bus=""
    rm -f "$cache_file"
  fi

  if [[ -z $bus ]]; then
    bus="$(detect_bus)" || return 1
    if [[ ! $bus =~ ^[0-9]+$ ]]; then
      cache_unavailable
      return 1
    fi
    mkdir -p "$cache_dir" 2>/dev/null || true
    printf '%s\n' "$bus" >"$cache_file" 2>/dev/null || true
  fi

  printf '%s\n' "$bus"
}

read_vcp() {
  local bus="$1"

  ddcutil --bus "$bus" --skip-ddc-checks getvcp 10 --brief 2>/dev/null | awk '
    $1 == "VCP" && toupper($2) == "10" && $3 == "C" && $4 ~ /^[0-9]+$/ && $5 ~ /^[0-9]+$/ && $5 > 0 {
      print $4, $5
      found = 1
      exit
    }

    END { exit !found }
  '
}

read_brightness() {
  local bus=""
  local now=0
  local values=""

  bus="$(find_bus)" || return 1
  values="$(read_vcp "$bus")" || {
    rm -f "$cache_file"
    return 1
  }

  now=$(date +%s)
  mkdir -p "$cache_dir" 2>/dev/null || true
  printf '%s %s %s\n' "$bus" "${values##* }" "$now" >"$cache_file" 2>/dev/null || true
  printf '%s %s\n' "$bus" "$values"
}

bus=""
current=""
maximum=""
percent=""
range_cached_at=""

if [[ -z $step ]]; then
  read -r bus current maximum < <(read_brightness) || exit 1
  [[ -n ${bus:-} && -n ${current:-} && -n ${maximum:-} ]] || exit 1
  (( percent = (current * 100 + maximum / 2) / maximum ))
  printf '%s\n' "$percent"
  exit 0
fi

if [[ $step =~ ^([0-9]+)%$ ]]; then
  target="${BASH_REMATCH[1]}"
  range_cache_fresh=0
  if [[ -r $cache_file ]]; then
    read -r bus maximum range_cached_at <"$cache_file" || true
  fi

  if [[ $bus =~ ^[0-9]+$ && $maximum =~ ^[0-9]+$ && $range_cached_at =~ ^[0-9]+$ ]] && (( maximum > 0 )); then
    now=$(date +%s)
    if (( range_cached_at <= now && now - range_cached_at < range_cache_seconds )); then
      range_cache_fresh=1
    fi
  fi

  if (( ! range_cache_fresh )); then
    read -r bus current maximum < <(read_brightness) || exit 1
  fi
elif [[ $step =~ ^\+([0-9]+)%$ ]]; then
  read -r bus current maximum < <(read_brightness) || exit 1
  [[ -n ${bus:-} && -n ${current:-} && -n ${maximum:-} ]] || exit 1
  (( percent = (current * 100 + maximum / 2) / maximum ))
  amount="${BASH_REMATCH[1]}"
  if (( amount == 5 && percent < 5 )); then
    (( target = percent + 1 ))
  else
    (( target = percent + amount ))
  fi
elif [[ $step =~ ^([0-9]+)%-$ ]]; then
  read -r bus current maximum < <(read_brightness) || exit 1
  [[ -n ${bus:-} && -n ${current:-} && -n ${maximum:-} ]] || exit 1
  (( percent = (current * 100 + maximum / 2) / maximum ))
  amount="${BASH_REMATCH[1]}"
  if (( amount == 5 && percent <= 5 )); then
    (( target = percent - 1 ))
  else
    (( target = percent - amount ))
  fi
else
  exit 1
fi

(( target < 1 )) && target=1
(( target > 100 )) && target=100
(( raw_target = (target * maximum + 50) / 100 ))

if ! ddcutil --bus "$bus" --skip-ddc-checks --noverify setvcp 10 "$raw_target" >/dev/null 2>&1; then
  rm -f "$cache_file"
  exit 1
fi

printf '%s\n' "$target"