97 lines
2.7 KiB
Plaintext
97 lines
2.7 KiB
Plaintext
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#!/bin/bash
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# Global readonly variables can't be shadowed by local variables so wrap
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# our code in a function so we can declare all variables local
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main() {
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# Customizable configuration constants
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local -r DEFAULT_RES=.25
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local -r DEFAULT_MOD_LIST='cpu mem bl vol-amixer bat dt'
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local -r DEFAULT_PRE=' '
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local -r DEFAULT_SEP_L='| '
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local -r DEFAULT_SEP_R=' '
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local -r DEFAULT_SUF=' '
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local -r res="${1-${DEFAULT_RES}}"
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local -r mod_list="${2-${DEFAULT_MOD_LIST}}"
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local -r pre="${3-${DEFAULT_PRE}}"
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local -r sep_l="${4-${DEFAULT_SEP_L}}"
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local -r sep_r="${5-${DEFAULT_SEP_R}}"
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local -r suf="${6-${DEFAULT_SUF}}"
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local -r MOD_DIR="$(dirname "$0")"/module
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local -r ACTION_DIR=/tmp/xrsb-action
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local -i ACTION_DIR_LEN=${#ACTION_DIR}
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# Cache module values so we can reuse them without recomputing them
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local -A stat_cache
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# Since stat_cache is hash ordered, maintain the display order of cache keys
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# so we can loop over the cache in display order to generate the full status
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local -a stat_ordered_keys
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local mod mod_file key
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# Process the module list
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for mod in ${mod_list}; do
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# Check if the module file exists
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mod_file="${MOD_DIR}/${mod}"
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if [[ -r "${mod_file}" ]]; then
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# Source the module, compute its key and add it to the ordered array,
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# and call the module function and store the value in the cache
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source "${mod_file}"
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key="${mod//-/_}"
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stat_ordered_keys+=("${key}")
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stat_cache["${key}"]="$("mod_${key}")"
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fi
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done
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draw_status() {
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local stat
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# Construct the status by looping over the cached values in display order
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for key in "${stat_ordered_keys[@]}"; do
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printf -v stat '%b%b%b%b' \
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"${stat}" "${sep_l}" "${stat_cache[${key}]}" "${sep_r}"
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done
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# Trim the leading left separator and trailing right separator, and
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# display the status
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local -ri offset=${#sep_l}
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local -ri len=$((${#stat} - offset - ${#sep_r}))
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xsetroot -name "${pre}${stat:${offset}:${len}}${suf}"
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}
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# Draw the initial status
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draw_status
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process_signal () {
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local -a actions
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local path do_redraw
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# Get the actions and purge the action directory
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readarray -d '' actions < \
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<(find "${ACTION_DIR}" -maxdepth 1 -type f -exec rm -f {} + -print0)
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# Process each action
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for path in "${actions[@]}"; do
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key="${path:$((ACTION_DIR_LEN + 1))}"
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# Call the module function if cache entry for the module is defined
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if [[ -v stat_cache[${key}] ]]; then
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stat_cache["${key}"]="$("mod_${key}")"
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do_redraw=1
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fi
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done
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if [[ -v do_redraw ]]; then draw_status; fi
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}
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# Wait for signals
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mkdir -p "${ACTION_DIR}"
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trap process_signal SIGUSR1
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while :; do
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sleep "${res}"
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done
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}
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main "$@"
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