79 lines
2.1 KiB
Bash
79 lines
2.1 KiB
Bash
#! /bin/bash
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# --- Configuration ---
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bar="▁▂▃▄▅▆▇█"
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# Number of bars Cava should output
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num_bars=8
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# Max height for ASCII output (should match length of bar string - 1)
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ascii_max_range=$((${#bar} - 1))
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# Temporary config file path (using PID $$ for uniqueness)
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config_file="/tmp/polybar_cava_config_$$"
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# --- Argument Handling ---
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if [ $# -lt 1 ]; then
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# Print error message to stderr
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echo "Error: Please provide the PulseAudio source name as an argument." >&2
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echo "Usage: $0 <cava_pulse_source_name>" >&2
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echo "Example: $0 alsa_output.pci-0000_00_1f.3.analog-stereo.monitor" >&2
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echo "You can find source names using: pactl list sources | grep 'Name:'" >&2
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exit 1
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fi
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# Assign the first argument to the pulse_source variable
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pulse_source="$1"
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# --- Functions ---
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# Function to clean up the temporary config file on exit
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cleanup() {
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rm -f "$config_file"
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}
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# --- Main Script ---
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# Set trap to call cleanup function on script exit (including Ctrl+C)
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trap cleanup EXIT
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# Build the sed dictionary string to replace numbers with bar characters
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dict="s/;//g;"
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i=0
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# Use modern arithmetic expansion and loop condition
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while ((i < ${#bar})); do
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# Safely append to the dictionary string
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dict="${dict}s/$i/${bar:$i:1}/g;"
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# Use modern arithmetic increment
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((i++))
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done
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# Create the Cava configuration file using printf for safety
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# Note: Using the pulse_source variable passed as an argument
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printf '%s\n' "
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[general]
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bars = $num_bars
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[input]
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method = pulse
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source = \"$pulse_source\"
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[output]
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method = raw
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raw_target = /dev/stdout
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data_format = ascii
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channels = mono
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mono_option = average
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ascii_max_range = $ascii_max_range
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" >"$config_file" || {
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echo "Error: Failed to write Cava config." >&2
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exit 1
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} # Exit if write fails
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# Run Cava with the generated config and process its output
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# Use 'exec cava' if you don't need the script to do anything after cava finishes
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cava -p "$config_file" | while IFS= read -r line; do
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# Translate numbers to bars using sed
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echo "$line" | sed "$dict"
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done
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# The trap will handle cleanup automatically here
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# If 'exec cava' was used above, this part is unreachable
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exit 0
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