144 lines
4 KiB
Bash
Executable file
144 lines
4 KiB
Bash
Executable file
#!/bin/sh
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#
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# Turn WLED installations in the C4 hackspace on/off, change brightness or
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# switch between presets.
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#
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# Author: Shy
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# License: CC0
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NAME="wled.sh"
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COMMAND="wled"
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VERSION="0.1.1"
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print_usage() {
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echo "\
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Usage: $COMMAND -f(norcenter)|-w(wohnzimmer) [on|off]
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$COMMAND -f|-w [1-17|list]
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$COMMAND -f|-w -b [1-255]"
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}
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print_help() {
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print_usage
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echo "
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host selection:
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-f,--fnordcenter select fnordcenter
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-w,--wohnzimmer select wohnzimmer
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commands:
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on|off switch on/off
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[1-17] switch preset
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l, list list presets
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-b,--brightness [1-255] set brightness"
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}
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curl_cmd() {
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curl --silent --show-error --fail --ipv4 --max-filesize 32K "$@"
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}
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active_preset() {
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# Find number of active preset. API returns -1 if none is active, we return
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# an empty string.
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preset="$(curl_cmd "http://$1/json" | \
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# -1 will be a no-match.
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sed -n 's/.*"ps"[[:space:]]*:[[:space:]]*\(1\?[0-9]\).*/\1/p')"
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printf '%u' "$preset"
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}
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# Parse host argument.
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case "$1" in
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""|-h|--help) # Missing host parameter.
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print_help
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exit 0
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;;
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-v|--version)
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echo "$NAME version $VERSION"
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exit 0
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;;
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-f|--fnordcenter)
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wled_host='wled-fnordcenter.local'
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;;
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-w|--wohnzimmer)
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wled_host='wled-wohnzimmer.local'
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;;
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*) # Unknown host parameter.
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echo "Error: unknown host \"$1\"." >&2
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print_usage
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exit 1
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;;
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esac
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# Parse and execute command argument.
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case "$2" in
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on) # Switch on.
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api_resp=$(curl_cmd --json '{"on":true}' "http://$wled_host/json")
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;;
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off) # Switch off.
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api_resp=$(curl_cmd --json '{"on":false}' "http://$wled_host/json")
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;;
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-b|--brightness) # Set brightness.
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if test -z "$3"; then
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echo "Error: missing parameter for brightness." >&2
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exit 1
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fi
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# Try to convert 3rd parameter to an integer between 1 an 255.
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bright=$(printf '%u' "$3" 2>/dev/null)
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if test $? -gt 0; then # Conversion failed.
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echo "Error: unable to parse parameter for brightness." >&2
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exit 1
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elif test "$bright" -lt 1 -o "$bright" -gt 255; then
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echo "Error: parameter for brightness is out of range." >&2
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exit 1
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fi
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api_resp=$(curl_cmd --json "{'bri':$bright}" "http://$wled_host/json")
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;;
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[1-9]|1[0-7]) # Switch to preset.
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api_resp=$(curl_cmd --json "{'ps':$2}" "http://$wled_host/json")
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;;
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l|list) # List presets.
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printf "loading ...\r"
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active_ps=$(active_preset "$wled_host")
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curl_cmd "http://$wled_host/presets.json" | \
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# Split into lines - one line per preset.
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sed --sandbox 's/"1\?[0-9]"[[:space:]]*:/\n&/g' | \
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# Prepend description, extract number and name of every preset,
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# match active preset, right-align numbers and finally select
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# lines to print.
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sed --sandbox -n \
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-e "1i\\Presets on $wled_host:" \
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-e 's/^"\(1\?[0-9]\)"[[:space:]]*:.*"n"[[:space:]]*:[[:space:]]*"\([[:print:]]*\)".*$/\1: \2/' \
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-e "s/^$active_ps:.*/& */" \
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-e 's/^[0-9]:/ &/' \
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-e '/^[1 ]\?[0-9]: [[:print:]]\+/p' | \
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# Sort.
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sort -b -n
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exit $?
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;;
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dump) # Dump JSON response from API.
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curl_cmd -w '\n' "http://$wled_host/json"
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exit 0
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;;
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"") # Missing command.
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echo "Error: missing command." >&2
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print_usage
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exit 1
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;;
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*) # Unknown command.
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echo "Error: unknown command \"$2\"." >&2
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print_usage
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exit 1
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;;
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esac
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# Check curl exit status
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curl_exit=$?
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if test $curl_exit -ne 0; then
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echo "Error: curl exited with exit code $curl_exit." >&2
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exit 1
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fi
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# Check API responce.
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if echo "$api_resp" | grep -qv '{\s*"success"\s*:\s*true\s*}'; then
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echo "Error: unexpected responce from WLED API." >&2
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exit 1
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fi
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