Nix Fix

- Return the first ancestor PID if root_name is not found.
- Return the process' own PID if its own name is root_name.

README.md

@@ -67,8 +67,8 @@ Then schedule the CPU and memory usage to be updated every 5 seconds.
 avds 'cpu mem' 5000 true &
 ```
 
-Finally, you can add these commmands to your volume and brightness keybindings
-to update the status when those keys are pressed. Note that these jobs don't
+You can add these commmands to your volume and brightness keybindings to
+update the status when those keys are pressed. Note that these jobs don't
 need to be backgrounded since they run immediately and exit.
 
 ```Shell
@@ -76,6 +76,15 @@ avds vol-amixer
 avds bl
 ```
 
+In case you have multiple daemons running, e.g., in different login sessions,
+you can update them all simultaneously. This would have all running daemons
+update the volume and backlight sections of their statuses at once.
+
+```Shell
+avds '>>* vol-amixer'
+avds '>>* bl'
+```
+
 You can also bind keys to commands like those in the `cmd` directory to
 perform actions and also update the status bar. For instance, you can bind
 keys to these commands to control the backlight and volume while also updating

avdd

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 USAGE="
 USAGE: avdd [<mod_list>='cpu mem bl vol-amixer bat dt'|-h|-[-]help]
@@ -38,13 +38,15 @@ EXAMPLES:
 
                 avdd 'vol-amixer dt' '[<' '<' '>' '>]' &
 "
-DEFAULT_MOD_LIST='cpu mem bl vol-amixer bat dt'
+DEFAULT_MOD_LIST='cpu mem vol-amixer bat dt'
 DEFAULT_PRE=' '
 DEFAULT_SEP_L='| '
 DEFAULT_SEP_R=' '
 DEFAULT_SUF=' '
-MOD_DIR="$(dirname "$0")"/mod
-FIFO=/tmp/avdd-fifo-"$("$(dirname "$0")"/rpid $$)"
+DIR="$(dirname "$0")"
+MOD_DIR="${DIR}/mod"
+DAEMON="$(basename "$0")"
+FIFO="/tmp/${DAEMON}-fifo-$("${DIR}/rpid" $$)"
 
 mod_list="${1-${DEFAULT_MOD_LIST}}"
 
@@ -78,7 +80,7 @@ for mod in "${mods[@]}"; do
   fi
 done
 
-# Construct and display the status by looping over the cached values in  order
+# Construct and display the status by looping over the cached values in order
 draw_status() {
   local mod stat
   for mod in "${stat_cache_ordered_mods[@]}"; do
@@ -100,7 +102,7 @@ draw_status
 # function to get the new value for that section of the status bar. If any
 # of the new values are different from the cached ones, update the cache
 # and redraw the status bar once after all the mods are processed.
-process_mods () {
+process_mods() {
   local mod new_val is_changed
   for mod in "$@"; do
     if [[ -v stat_cache[${mod}] ]]; then

avds

@@ -1,11 +1,12 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 USAGE="
 USAGE: avds <mod_list|-h|-[-]help> [<when>] [<repeat>]
 
         mod_list
                 A comma or space separated list of modules to request that
-                the daemon execute.
+                the daemon execute. If mod_list begins this '>>* ', then
+                requests are sent to all running daemons.
 
         when    The integer number of milliseconds to wait before sending the
                 request, or one of the following values:
@@ -31,6 +32,10 @@ EXAMPLES:
 
                 avds 'vol,bl'
 
+        Send the previous requests to all running daemons.
+
+                avds '>>* vol,bl'
+
         If there are cpu and memory usage modules named 'cpu' and 'mem'
         that update the cpu and memory usage statuses, send a requst to
         update both of those statuses every 5 seconds.
@@ -44,10 +49,9 @@ EXAMPLES:
                 avds 'bat,dt' m true
 "
 DAEMON=avdd
-FIFO=/tmp/"${DAEMON}"-fifo-"$("$(dirname "$0")"/rpid $$)"
 
 # Convert integer milliseconds to floating point seconds
-ms_to_s () {
+ms_to_s() {
   printf '%.3f' "${1}e-3"
 }
 
@@ -65,6 +69,15 @@ if [[ "${mod_list}" =~ ^(-h|-(-)?help)$ ]]; then
   exit 0
 fi
 
+# Check if we will be sending requests to all daemons, or set the named pipe
+# for this login session
+if [[ "${mod_list}" =~ ^\>\>\*\  ]]; then
+  mod_list="${mod_list:4}"
+  is_request_all=1
+else
+  fifo="/tmp/${DAEMON}-fifo-$("$(dirname "$0")/rpid" $$)"
+fi
+
 when="${2:-0}"
 
 # Validate when
@@ -87,7 +100,7 @@ while [[ "${first_run}" -eq 1 || -n "${repeat}" ]]; do
     else
       case "${when}" in
         m)
-          sleep $((60 - $(date +%S)))
+          sleep $((60 - 10#$(date +%S)))
           ;;
         h)
           readarray -t ms < <(date +'%M%n%S')
@@ -103,11 +116,24 @@ while [[ "${first_run}" -eq 1 || -n "${repeat}" ]]; do
     fi
   fi
 
-  # Write each command to the pipe
-  if [[ ! -p "${FIFO}" ]]; then
-    printf 'The daemon %s is not running\n' "${DAEMON}" 1>&2
-    exit 1
+  # Write each command to the named pipe for this login session
+  if [[ ! -v is_request_all ]]; then
+    if [[ ! -p "${fifo}" ]]; then
+      printf 'The daemon %s is not running\n' "${DAEMON}" 1>&2
+      exit 1
+    fi
+    printf '%s\n' "${mod_list}" >> "${fifo}"
+  # Write each command to all the daemon named pipes
+  else
+    readarray -d '' fifos \
+      < <(find /tmp -maxdepth 1 -type p -name "${DAEMON}-fifo-*" -print0)
+    if [[ "${#fifos[@]}" -eq 0 ]]; then
+      printf 'There are no daemons running\n' 1>&2
+      exit 1
+    fi
+    for fifo in "${fifos[@]}"; do
+      printf '%s\n' "${mod_list}" >> "${fifo}"
+    done
   fi
-  printf '%s\n' "${mod_list}" >> "${FIFO}"
 done
 

mod/bat

@@ -1,11 +1,11 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 mod_bat () {
   # Customizable configuration constants
   local -r DEFAULT_CNT=1
-  local -r DEFAULT_PRE_PLG=' '
-  local -r DEFAULT_PRE_UPLG=' '
-  local -r DEFAULT_PRE_UNK=' '
+  local -r DEFAULT_PRE_PLG=$'\u26A1 '
+  local -r DEFAULT_PRE_UPLG=$'\u2755 '
+  local -r DEFAULT_PRE_UNK='?? '
   local -r DEFAULT_SUF='%'
 
   local -r cnt="${1:-${DEFAULT_CNT}}"

mod/bl

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 mod_bl () {
   # Customizable configuration constants

mod/cpu

@@ -1,8 +1,8 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 mod_cpu () {
   # Customizable configuration constants
-  local -r DEFAULT_PRE=' '
+  local -r DEFAULT_PRE=$'\U0001F7E9 '
   local -r DEFAULT_SUF=''
 
   local -r pre="${1-${DEFAULT_PRE}}"

mod/dt

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 mod_dt () {
   # Customizable configuration constants

mod/mem

@@ -1,8 +1,8 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 mod_mem () {
   # Customizable configuration constants
-  local -r DEFAULT_PRE=' '
+  local -r DEFAULT_PRE=$'\U0001F9E0 '
   local -r DEFAULT_SUF='%'
 
   local -r pre="${1-${DEFAULT_PRE}}"

mod/vol-amixer

@@ -1,12 +1,12 @@
-#!/bin/bash
+#!/usr/bin/env 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_PRE_LOW=$'\U0001F508 '
+  local -r DEFAULT_PRE_HI=$'\U0001F50A '
+  local -r DEFAULT_PRE_MUTE=$'\U0001F507 '
   local -r DEFAULT_SUF='%'
 
   local -r pre_low="${1-${DEFAULT_PRE_LOW}}"

rpid

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 USAGE='
 USAGE: rpid <pid|-h|-[-]help> [<root_name>=login]
@@ -22,6 +22,16 @@ EXAMPLES:
         process.
 
                 rpid
+
+        Get the PID of the first ancestor of the current process, if there
+        is no ancestor named "not_a_process."
+
+                rpid $$ not_a_process
+
+        Get the PID of the current process itself, if it is named
+        "current_process."
+
+                rpid $$ current_process
 '
 
 # Validate the arguments
@@ -40,25 +50,19 @@ fi
 
 root_name="${2:-login}"
 
-get_info() {
-  local -ri current_pid="$1"
-  if [[ ! -r "/proc/${current_pid}/status" ]]; then exit 1; fi
+prev_pid="${pid}"
+current_pid="${pid}"
+while [[ "${name}" != "${root_name}" && -r "/proc/${current_pid}/status" ]]; do
   mapfile info < \
     <(grep --null -E -m 2 '^(Name|PPid):' "/proc/${current_pid}/status" \
       | sort | cut -f 2)
   name="${info[0]##[[:space:]]}"
   name="${name%%[[:space:]]}"
-  ppid="${info[1]##[[:space:]]}"
-  ppid="${ppid%%[[:space:]]}"
-}
-
-next_pid="${pid}"
-while [[ "${name}" != "${root_name}" && "${ppid}" -ne 1 ]]; do
-  get_info "${next_pid}";
-  name_pid="${next_pid}"
-  next_pid="${ppid}"
+  prev_pid="${current_pid}"
+  current_pid="${info[1]##[[:space:]]}"
+  current_pid="${current_pid%%[[:space:]]}"
 done
 
+printf '%s\n' "${prev_pid}"
 if [[ "${name}" != "${root_name}" ]]; then exit 1; fi
-printf '%s\n' "${name_pid}"
 

util

@@ -0,0 +1,95 @@
+#!/usr/bin/env bash
+
+if [[ -v IS_SOURCED_UTIL ]]; then return 0; fi
+IS_SOURCED_UTIL=1
+
+# Show the usage if requested and exit
+maybe_show_usage_and_exit() {
+  local -r arg="${1}"
+  if [[ "${arg}" =~ ^(-h|-(-)?help)$ ]]; then
+    printf %s "${USAGE:-No help}" 1>&2
+    exit 0
+  fi
+}
+
+# Get the ms since the epoch until now
+tick_now() {
+  local -r out_name="${1}"
+  printf -v "${out_name}" %.0f "$(date +%s.%N)"e3
+}
+
+# Get the ms since the epoch until the given at spec
+tick_at() {
+  local -r out_name="${1}" at_spec="${2}"
+  local -i now_ms now_s h m s s_to_d
+  tick_now now_ms
+  if [[ "${at_spec}" =~ ^[0-9]+$ ]]; then
+    printf -v "${out_name}" %d $((now_ms + at_spec))
+  else
+    now_s=$((now_ms / 1000))
+    case "${at_spec}" in
+      m)
+        printf -v "${out_name}" %d $(((now_s + 60 - now_s % 60) * 1000))
+        ;;
+      h)
+        printf -v "${out_name}" %d $(((now_s + 3600 - now_s % 3600) * 1000))
+        ;;
+      d)
+        # Work off the local time to account for the timezone since the
+        # epoch is aligned to a UTC day boundary
+        read -r h m s < <(date +'%H %M %S')
+        s_to_d=$(((24 - h) * 3600 - m * 60 - s))
+        printf -v "${out_name}" %d $(((now_s + s_to_d) * 1000))
+        ;;
+      *)
+        return 1
+        ;;
+    esac
+  fi
+}
+
+# Get the ms from now until the given ms since the epoch
+ms_until() {
+  local -r out_name="${1}" until_ms="${2}"
+  local -i now_ms
+  tick_now now_ms
+  printf -v "${out_name}" %d $((until_ms - now_ms))
+}
+
+# Convert integer milliseconds to floating point seconds
+ms_to_s() {
+  local -r out_name="${1}"
+  local -ri ms="${2}"
+  printf -v "${out_name}" %.3f "${ms}e-3"
+}
+
+# Map the module file name to the module function
+mod_to_fn() {
+  local -r out_name="${1}" file_name="${2}"
+  printf mod_%s "${file_name//-/_}"
+}
+
+# Get the pid of the ancestor process with the given name
+root_pid() {
+  local -r out_name="${1}"
+  local -ri pid="${2:-$$}"
+  local -r root_name="${3:-login}"
+  local -i current_pid="${pid}"
+  local name
+  while [[ "${current_pid}" -ne 1 ]]; do
+    if [[ ! -r "/proc/${current_pid}/status" ]]; then return 1; fi
+    mapfile info < \
+      <('grep' --null -E -m 2 '^(Name|PPid):' "/proc/${current_pid}/status" \
+        | 'sort' | 'cut' -f 2)
+    name="${info[0]##[[:space:]]}"
+    name="${name%%[[:space:]]}"
+    if [[ "${name}" = "${root_name}" ]]; then
+      printf -v "${out_name}" %s "${current_pid}"
+      return 0
+    fi
+    current_pid="${info[1]##[[:space:]]}"
+    current_pid="${current_pid%%[[:space:]]}"
+  done
+  return 1
+}
+