feat: add script to adjust microphone volume to 100% on macOS, to avoid "auto adjusting"

README.md

@@ -13,6 +13,7 @@ Additionally I install next software, that is not (yet) presented in Brew:
 
 1. Install Brew from here: https://brew.sh/
 2. Copy Brewfile to your computer and run `brew bundle` from the same folder where you copied the file.
+3. Run `chmod +x ./cron-adjust-microphone-gain-to-100.sh` and `./cron-adjust-microphone-gain-to-100.sh` [to change microphone gain to 100% on macOS](https://apple.stackexchange.com/questions/97810/mac-osx-microphone-input-volume-level-auto-adjusts-can-it-be-disabled).
 
 Note: Brew will ask you for the root password and other apps inside Brewfile might ask you for your password as well.  
 Usually installation takes 10-20 min, so make sure to brew a cup of tea or coffee :)

cron-adjust-microphone-gain-to-100.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+# If the microphone gain is less than 100, increase it by 3 every 0.1 seconds until it reaches 100
+CRON_JOB="* * * * * while (( \$(osascript -e \"input volume of (get volume settings)\") < 100 )); do osascript -e \"set volume input volume (input volume of (get volume settings) + 3)\"; sleep 0.1; done;"
+
+# Escape percent signs for cron
+ESCAPED_CRON_JOB=$(echo "${CRON_JOB}" | sed 's/%/\\%/g')
+
+# Backup current crontab (just in case)
+CRONTAB_BACKUP=$(crontab -l)
+
+# Check if the cron job already exists
+if echo "${CRONTAB_BACKUP}" | grep -F -- "${CRON_JOB}" > /dev/null 2>&1; then
+    echo "Cron job already exists. Not adding again."
+else
+    # Add the cron job to the crontab
+    (echo "${CRONTAB_BACKUP}"; echo "${ESCAPED_CRON_JOB}") | crontab -
+    echo "Cron job added."
+fi