From 4906e7b6b6c5b5b00c98e17b47cfc7d94d6849e6 Mon Sep 17 00:00:00 2001
From: binaryDiv <binarydiv@gmail.com>
Date: Sun, 1 Mar 2020 05:04:43 +0100
Subject: [PATCH] add bin/volctl (version 0.1.0) + bash completion

---
 .bash_completion.d/20-volctl.sh |   3 +
 bin/volctl                      | 167 ++++++++++++++++++++++++++++++++
 2 files changed, 170 insertions(+)
 create mode 100644 .bash_completion.d/20-volctl.sh
 create mode 100755 bin/volctl

diff --git a/.bash_completion.d/20-volctl.sh b/.bash_completion.d/20-volctl.sh
new file mode 100644
index 0000000..420038c
--- /dev/null
+++ b/.bash_completion.d/20-volctl.sh
@@ -0,0 +1,3 @@
+# Enable bash completion for volctl (if installed)
+[[ -x "$HOME/bin/volctl" ]] && source <($HOME/bin/volctl bash-completion)
+
diff --git a/bin/volctl b/bin/volctl
new file mode 100755
index 0000000..d5541ca
--- /dev/null
+++ b/bin/volctl
@@ -0,0 +1,167 @@
+#!/bin/bash
+
+# volctl -- Simple shell tool to control pulseaudio volume
+# Version: 0.1.0
+# Author: binaryDiv
+
+# Set bash strict mode
+set -euo pipefail
+IFS=$'\n\t'
+
+
+# Default settings
+# ----------------
+
+SINK="@DEFAULT_SINK@"
+DEFAULTSTEP="5%"
+DEFAULTVOLUME="60%"
+GUICOMMAND="pavucontrol"
+
+
+# Define command functions
+# ------------------------
+
+usage() {
+    cat << END_OF_HELPTEXT
+Usage: $(basename $0) COMMAND [...]
+
+Controls pulseaudio volume for default sink.
+
+General commands:
+  help             print this help message
+  bash-completion  output bash completion code
+
+Volume control:
+  up [STEP%]       increase volume by STEP% (default: $DEFAULTSTEP)
+  down [STEP%]     decrease volume by STEP% (default: $DEFAULTSTEP)
+  set VOL%         set volume to VOL%
+  set default      set volume to default value ($DEFAULTVOLUME)
+  mute             mute sound output
+  unmute           unmute sound output
+  mute toggle      toggle mute
+
+User interfaces:
+  gui              open GUI tool ($GUICOMMAND)
+END_OF_HELPTEXT
+}
+
+fail() {
+    echo "$@"
+    exit 1
+}
+
+vol_set() {
+    local VALUE=$1
+    pactl set-sink-volume "$SINK" "$VALUE"
+}
+
+vol_mute() {
+    local OPTION=$1
+    pactl set-sink-mute "$SINK" "$OPTION"
+}
+
+open_gui() {
+    exec $GUICOMMAND
+}
+
+print_bash_completion() {
+    cat << 'END_OF_BASHCOMPLETION'
+# Use "source <(volctl bash-completion)" to activate bash completion.
+
+_volctl() {
+    COMPREPLY=()
+    local cur="${COMP_WORDS[COMP_CWORD]}"
+    local commands="help up down set mute unmute gui"
+
+    if [[ $COMP_CWORD -eq 1 ]]; then
+        # First argument: command
+        COMPREPLY=($(compgen -W "$commands" -- $cur))
+    elif [[ $COMP_CWORD -eq 2 ]]; then
+        # Second argument
+        case "${COMP_WORDS[1]}" in
+            set)
+                compopt -o nosort
+                COMPREPLY=($(compgen -W "default 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%" -- $cur))
+            ;;
+            mute)
+                COMPREPLY=($(compgen -W "toggle" -- $cur))
+            ;;
+        esac
+    fi
+}
+complete -F _volctl volctl
+END_OF_BASHCOMPLETION
+}
+
+# Entrypoint
+# ----------
+
+main() {
+    # Get command from arguments
+    local COMMAND="${1:-}"
+
+    case "$COMMAND" in
+        help | --help | -h | '')
+            usage
+            exit 1
+        ;;
+
+        up)
+            # Command: up [STEP%]
+            local STEP="+${2:-$DEFAULTSTEP}"
+            vol_set "$STEP"
+        ;;
+
+        down)
+            # Command: down [STEP%]
+            local STEP="-${2:-$DEFAULTSTEP}"
+            vol_set "$STEP"
+        ;;
+
+        set)
+            # Command: set VOL% | set default
+            local VOL="${2:-}"
+            if [[ -z $VOL ]]; then
+                fail "Command 'set' needs an argument, see 'help'."
+            elif [[ $VOL == 'default' ]]; then
+                vol_set "$DEFAULTVOLUME"
+            else
+                vol_set "$VOL"
+            fi
+        ;;
+
+        mute)
+            # Command: mute | mute toggle
+            local OPTION="${2:-}"
+            if [[ -z $OPTION ]]; then
+                vol_mute 1
+            elif [[ $OPTION == 'toggle' ]]; then
+                vol_mute toggle
+            else
+                fail "Unknown option '$OPTION' for command 'mute', see 'help'."
+            fi
+        ;;
+
+        unmute)
+            # Command: unmute
+            vol_mute 0
+        ;;
+
+        gui)
+            # Command: gui
+            open_gui
+        ;;
+
+        bash-completion)
+            # Command: bash-completion
+            print_bash_completion
+        ;;
+
+        *)
+            fail "Unknown command '$COMMAND', use 'help' to show all commands."
+        ;;
+    esac
+}
+
+main "$@"
+