98 lines
3.0 KiB
Bash
Executable File
98 lines
3.0 KiB
Bash
Executable File
#!/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_MOD_LIST='cpu mem bl vol-amixer bat dt'
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local -r DEFAULT_RES=.25
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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 mod_list="${1-${DEFAULT_MOD_LIST}}"
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local -r res="${2:-${DEFAULT_RES}}"
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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 (as defined
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# by mod_list) of the keys so we can loop over the cache in display order
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# when generating the full status
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local -a stat_cache_ordered_mods
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local mod mod_file
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# Map the module file name to the module function
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mod_to_fn() {
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printf 'mod_%s' "${1//-/_}"
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}
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# For each module in the list, if the module file exists then source it, add
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# its name to the ordered array, and call its function and cache the value
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for mod in ${mod_list}; do
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mod_file="${MOD_DIR}/${mod}"
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if [[ -r "${mod_file}" ]]; then
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# shellcheck source=/dev/null
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source "${mod_file}"
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stat_cache_ordered_mods+=("${mod}")
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stat_cache["${mod}"]="$("$(mod_to_fn "${mod}")")"
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fi
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done
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# Construct and display the status by looping over the cached values in order
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draw_status() {
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local mod stat
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for mod in "${stat_cache_ordered_mods[@]}"; do
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printf -v stat '%b%b%b%b' \
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"${stat}" "${sep_l}" "${stat_cache[${mod}]}" "${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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# For each file in the action directory, remove the file, and if a module for
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# the action is cached, call the module function and update the cache. If
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# any cache entries were updated, redraw the status.
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process_signal () {
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local -a action_paths
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local action_path mod is_changed
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readarray -d '' action_paths< \
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<(find "${ACTION_DIR}" -maxdepth 1 -type f -exec rm -f {} + -print0)
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for action_path in "${action_paths[@]}"; do
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mod="${action_path:$((ACTION_DIR_LEN + 1))}"
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if [[ -v stat_cache[${mod}] ]]; then
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stat_cache["${mod}"]="$("$(mod_to_fn "${mod}")")"
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is_changed=1
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fi
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done
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if [[ -v is_changed ]]; then draw_status; fi
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}
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# Wait for signals
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mkdir -p "${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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