Update install script for M1 Macs and Homebrew (#3496)

* Update install script for M1 Macs and Homebrew

Hi!

I saw this comment https://github.com/tuist/tuist/issues/3299#issuecomment-900088290 while exploring the repo and I thought I might make a small fix. I'm a little unsure about a couple things (I'm primarily a fish user so my bash is a little rusty 😅). Completely open to feedback though!

* Update patch to not depend on homebrew

* Move to not depending on homebrew for INSTALL_DIR

* Address Feedback

* Tiny fixes

1. Turns out, `bash -c` expects quotes around arguments
2. Add a sudo check for making the installation directory in case it doesn't exist and it needs root access

* fix: spacing

Co-authored-by: Daniele Formichelli <df@bendingspoons.com>

script/install

@@ -33,16 +33,27 @@ ohai "Unzipping tuistenv..."
 unzip -o /tmp/tuistenv.zip -d /tmp/tuistenv > /dev/null
 ohai "Installing tuistenv..."
 
-if [[ ! -d "/usr/local/bin" ]]; then
-  mkdir -p /usr/local/bin/
+INSTALL_DIR="/usr/local/bin"
+
+sudo_if_install_dir_not_writeable() {
+  local command="$1"
+  if [ -w $INSTALL_DIR ]; then
+    bash -c "${command}"
+  else
+    bash -c "sudo ${command}"
+  fi
+}
+
+if [[ ! -d $INSTALL_DIR ]]; then
+  sudo_if_install_dir_not_writeable "mkdir -p ${INSTALL_DIR}"
 fi
 
-if [[ -f "/usr/local/bin/tuist" ]]; then
-  rm /usr/local/bin/tuist
+if [[ -f "${INSTALL_DIR}/tuist" ]]; then
+  sudo_if_install_dir_not_writeable "rm ${INSTALL_DIR}/tuist"
 fi
 
-mv /tmp/tuistenv/tuistenv /usr/local/bin/tuist
-chmod +x /usr/local/bin/tuist
+sudo_if_install_dir_not_writeable "mv /tmp/tuistenv/tuistenv \"${INSTALL_DIR}/tuist\""
+sudo_if_install_dir_not_writeable "chmod +x \"${INSTALL_DIR}/tuist\""
 
 rm -rf /tmp/tuistenv
 rm /tmp/tuistenv.zip

script/uninstall

@@ -20,7 +20,18 @@ warn() {
   printf "${tty_red}Warning${tty_reset}: %s\n" "$(chomp "$1")"
 }
 
-rm -rf /usr/local/bin/tuist
+INSTALL_DIR="/usr/local/bin"
+
+sudo_if_install_dir_not_writeable() {
+  local command="$1"
+  if [ -w $INSTALL_DIR ]; then
+    bash -c $command
+  else
+    bash -c "sudo ${command}"
+  fi
+}
+
+sudo_if_install_dir_not_writeable "rm -rf /usr/local/bin/tuist"
 rm -rf ~/.tuist
 
 ohai "Tuist uninstalled"