Feat: CPU, memory, backlight and volume modules

module/bl

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+mod_bl () {
+  # Customizable configuration constants
+  local -r DEFAULT_PRE=' '
+  local -r DEFAULT_SUF='%'
+
+  local -r pre="${1-${DEFAULT_PRE}}"
+  local -r suf="${2-${DEFAULT_SUF}}"
+
+  local bl_file bl max_bl_file max_bl
+
+  bl_file="$(find /sys/class/backlight/*/brightness | head -n 1)"
+  max_bl_file="$(dirname "${bl_file}")/max_brightness"
+  read -r bl < "${bl_file}"
+  read -r max_bl < "${max_bl_file}"
+  # Use printf to do floating point arithmetic
+  printf '%b%3.0f%b' "${pre}" "$((bl * 1000 / max_bl))e-1" "${suf}"
+}
+

module/cpu

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+mod_cpu () {
+  # Customizable configuration constants
+  local -r DEFAULT_PRE=' '
+  local -r DEFAULT_SUF=''
+
+  local -r pre="${1-${DEFAULT_PRE}}"
+  local -r suf="${2-${DEFAULT_SUF}}"
+
+  printf '%b' "${pre}"
+  ps --no-headers -A -o %cpu | awk '{cpu = cpu + $1} END {printf "%3.0f", cpu}'
+  printf '%b' "${suf}"
+}
+

module/mem

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+mod_mem () {
+  # Customizable configuration constants
+  local -r DEFAULT_PRE=' '
+  local -r DEFAULT_SUF='%'
+
+  local -r pre="${1-${DEFAULT_PRE}}"
+  local -r suf="${2-${DEFAULT_SUF}}"
+
+  printf '%b' "${pre}"
+  free | awk 'NR == 2 {printf "%3.0f", $3 * 100 / $2}'
+  printf '%b' "${suf}"
+}
+

module/vol-amixer

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Requires amixer from the alsa-utils package
+
+mod_vol_amixer () {
+  # Customizable configuration constants
+  local -r DEFAULT_PRE_LOW=' '
+  local -r DEFAULT_PRE_HI=' '
+  local -r DEFAULT_PRE_MUTE=' '
+  local -r DEFAULT_SUF='%'
+
+  local -r pre_low="${1-${DEFAULT_PRE_LOW}}"
+  local -r pre_hi="${2-${DEFAULT_PRE_HI}}"
+  local -r pre_mute="${3-${DEFAULT_PRE_MUTE}}"
+  local -r suf="${4-${DEFAULT_SUF}}"
+
+  local pre info stat vol
+
+  info="$(amixer get Master | tail -n 1)"
+  stat="$(sed -E 's/.*\[(.*)\]/\1/' <<< "${info}")"
+  vol="$(sed -E 's/.*\[(.*)%\].*/\1/' <<< "${info}")"
+
+  case "${stat}" in
+    on)
+      if [[ "${vol}" -lt 50 ]]; then pre="${pre_low}";
+      else pre="${pre_hi}"; fi
+      ;;
+    *)
+      pre="${pre_mute}"
+      ;;
+  esac
+  printf '%b%3d%b' "${pre}" "${vol}" "${suf}"
+}
+