Update volume

update script and add source links

.config/i3/scripts/volume

@@ -15,6 +15,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+# original source: https://github.com/vivien/i3blocks-contrib/tree/master/volume
+# check the readme: https://github.com/vivien/i3blocks-contrib/blob/master/volume/README.md
 #------------------------------------------------------------------------
 
 # The second parameter overrides the mixer selection
@@ -23,7 +25,7 @@
 # For ALSA users, you may use "default" for your primary card
 # or you may use hw:# where # is the number of the card desired
 if [[ -z "$MIXER" ]] ; then
-    MIXER="pulse"
+    MIXER="default"
     if command -v pulseaudio >/dev/null 2>&1 && pulseaudio --check ; then
         # pulseaudio is running, but not all installations use "pulse"
         if amixer -D pulse info >/dev/null 2>&1 ; then
@@ -50,15 +52,23 @@ if [[ -z "$STEP" ]] ; then
     STEP="${1:-5%}"
 fi
 
+# AMIXER(1):
+# "Use the mapped volume for evaluating the percentage representation like alsamixer, to be
+# more natural for human ear."
+NATURAL_MAPPING=${NATURAL_MAPPING:-0}
+if [[ "$NATURAL_MAPPING" != "0" ]] ; then
+    AMIXER_PARAMS="-M"
+fi
+
 #------------------------------------------------------------------------
 
 capability() { # Return "Capture" if the device is a capture device
-  amixer -D $MIXER get $SCONTROL |
+  amixer $AMIXER_PARAMS -D $MIXER get $SCONTROL |
     sed -n "s/  Capabilities:.*cvolume.*/Capture/p"
 }
 
 volume() {
-  amixer -D $MIXER get $SCONTROL $(capability)
+  amixer $AMIXER_PARAMS -D $MIXER get $SCONTROL $(capability)
 }
 
 format() {
@@ -75,9 +85,9 @@ format() {
 #------------------------------------------------------------------------
 
 case $BLOCK_BUTTON in
-  3) amixer -q -D $MIXER sset $SCONTROL $(capability) toggle ;;  # right click, mute/unmute
-  4) amixer -q -D $MIXER sset $SCONTROL $(capability) ${STEP}+ unmute ;; # scroll up, increase
-  5) amixer -q -D $MIXER sset $SCONTROL $(capability) ${STEP}- unmute ;; # scroll down, decrease
+  3) amixer $AMIXER_PARAMS -q -D $MIXER sset $SCONTROL $(capability) toggle ;;  # right click, mute/unmute
+  4) amixer $AMIXER_PARAMS -q -D $MIXER sset $SCONTROL $(capability) ${STEP}+ unmute ;; # scroll up, increase
+  5) amixer $AMIXER_PARAMS -q -D $MIXER sset $SCONTROL $(capability) ${STEP}- unmute ;; # scroll down, decrease
 esac
 
 volume | format