bootstrap: zsh: feat: Add macOS support

.config/yadm/bootstrap.d/zsh.sh

@@ -1,17 +1,72 @@
-#!/bin/bash
+source $HOME/.zshenv
 
 if ! command -v zsh &> /dev/null; then
     echo 'Installing zsh'
+
+    if [[ "$OSNAME" == "Linux" ]]; then
+        # Linux
+        if [[ "$DISTRO_TYPE" == "debian" ]]; then
+            # Debian-based
             sudo apt update
             sudo apt install zsh -y
+        elif [[ "$DISTRO_TYPE" == "rpm" ]]; then
+            # RPM-based
+            echo 'ERROR: Currently unsupported'
+            echo 'Exiting...'
+            exit 1
+        elif [[ "$DISTRO_TYPE" == "arch" ]]; then
+            # Arch-based
+            echo 'ERROR: Currently unsupported'
+            echo 'Exiting...'
+            exit 1
+        else
+            # Unknown distro
+            echo 'ERROR: Unknown distro'
+            echo 'Exiting...'
+            exit 1
+        fi
+    elif [[ "$OSNAME" == "macOS" ]]; then
+        # macOS
+        brew install zsh
+    else
+        # Unknown
+        echo 'ERROR: Unknown OS'
+        echo 'Exiting...'
+        exit 1
+    fi
 fi
 
 echo 'zsh is installed'
 
+
+if [[ "$OSNAME" == "Linux" ]]; then
+    # Linux
     if [ ! $(awk -F: -v user="$USER" '$1 == user {print $NF}' /etc/passwd) = $(which zsh) ]; then
         echo 'zsh is not default shell'
         echo 'Setting zsh as default shell...'
         sudo chsh -s $(which zsh) $(whoami)
     fi
+elif [[ "$OSNAME" == "macOS" ]]; then
+    # macOS
+    if [[ "$SHELL" == "/bin/zsh" ]]; then
+        echo 'Homebrew zsh is not default shell'
+
+        if ! brew list zsh > /dev/null ; then
+            # Homebrew zsh not installed
+            echo 'Installing zsh from Homebrew'
+            brew install zsh
+        fi
+        echo 'Homebrew zsh installed'
+
+        echo 'Setting Homebrew zsh as default shell...'
+        grep -qxF "$(brew --prefix zsh)/bin/zsh" /etc/shells || sudo bash -c "echo $(brew --prefix zsh)/bin/zsh >> /etc/shells"
+        sudo chsh -s "$(brew --prefix zsh)/bin/zsh" $(whoami)
+    fi
+else
+    # Unknown
+    echo 'ERROR: Unknown OS'
+    echo 'Exiting...'
+    exit 1
+fi
 
 echo 'zsh is default shell'