docs: add unix install script

website/static/install.sh

@@ -0,0 +1,158 @@
+#!/usr/bin/env sh
+
+install_dir=""
+
+help() {
+    # Display Help
+    echo "Installs Oh My Posh"
+    echo
+    echo "Syntax: install.sh [-h|d]"
+    echo "options:"
+    echo "h     Print this Help."
+    echo "d     Specify the installation directory. Defaults to /usr/local/bin or the directory where oh-my-posh is installed."
+    echo
+}
+
+while getopts ":hd:" option; do
+   case $option in
+      h) # display Help
+         help
+         exit;;
+      d) # Enter a name
+         install_dir=$OPTARG;;
+     \?) # Invalid option
+         echo "Invalid option command line option. Use -h for help."
+         exit 1
+   esac
+done
+
+SUPPORTED_TARGETS="linux-amd64 linux-arm linux-arm64 darwin-amd64 darwin-arm64"
+
+validate_dependency() {
+    if ! command -v $1 >/dev/null; then
+        printf "$1 is required to install Oh My Posh. Please install $1 and try again.\n"
+        exit 1
+    fi
+}
+
+validate_dependencies() {
+    validate_dependency curl
+    validate_dependency unzip
+    validate_dependency realpath
+    validate_dependency dirname
+}
+
+set_install_directory() {
+    if [ -n "$install_dir" ]; then
+        # expand directory
+        install_dir="${install_dir/#\~/$HOME}"
+        return 0
+    fi
+
+    # check if we have oh-my-posh installed, if so, use the executable directory
+    # to install into and follow symlinks
+    if command -v oh-my-posh >/dev/null; then
+        posh_dir=$(command -v oh-my-posh)
+        real_dir=$(realpath $posh_dir)
+        install_dir=$(dirname $real_dir)
+        printf "Oh My Posh is already installed, updating existing installation in:\n"
+        printf "  ${install_dir}\n"
+    else
+        install_dir="/usr/local/bin"
+    fi
+}
+
+validate_install_directory() {
+    if [ ! -d "$install_dir" ]; then
+        printf "Directory ${install_dir} does not exist, set a different directory and try again."
+        exit 1
+    fi
+
+    # check if we can write to the install directory
+    if [ ! -w $install_dir ]; then
+        printf "Cannot write to ${install_dir}. Please run the script with sudo and try again:\n"
+        printf "  sudo ./install.sh"
+        exit 1
+    fi
+}
+
+install() {
+    arch=$(detect_arch)
+    platform=$(detect_platform)
+    target="${platform}-${arch}"
+
+    good=$(
+        IFS=" "
+        for t in $SUPPORTED_TARGETS; do
+        if [ "${t}" = "${target}" ]; then
+            printf 1
+            break
+        fi
+        done
+    )
+
+    if [ "${good}" != "1" ]; then
+        printf "${arch} builds for ${platform} are not available for Oh My Posh"
+        exit 1
+    fi
+
+    printf "\nℹ️  Installing oh-my-posh for ${target} in ${install_dir}\n"
+
+    executable=${install_dir}/oh-my-posh
+    url=https://github.com/JanDeDobbeleer/oh-my-posh/releases/latest/download/posh-${target}
+
+    printf "⬇️  Downloading oh-my-posh from ${url}\n"
+
+    curl -s -L https://github.com/JanDeDobbeleer/oh-my-posh/releases/latest/download/posh-${target} -o $executable
+    chmod +x $executable
+
+    # install themes in cache
+    cache_dir=$(oh-my-posh cache path)
+
+    printf "🎨 Installing oh-my-posh themes in ${cache_dir}/themes\n\n"
+
+    theme_dir="${cache_dir}/themes"
+    mkdir -p $theme_dir
+    curl -s -L https://github.com/JanDeDobbeleer/oh-my-posh/releases/latest/download/themes.zip -o ${cache_dir}/themes.zip
+    unzip -o -q ${cache_dir}/themes.zip -d $theme_dir
+    chmod u+rw ${theme_dir}/*.omp.*
+    rm ${cache_dir}/themes.zip
+
+    printf "🚀 Installation complete.\n\nYou can follow the instructions at https://ohmyposh.dev/docs/installation/prompt\n"
+    printf "to setup your shell to use oh-my-posh.\n\n"
+    printf "If you want to use a built-in theme, you can find them in the ${theme_dir} directory:\n"
+    printf "  oh-my-posh init {shell} --config theme ${theme_dir}/{theme}.omp.json\n\n"
+}
+
+detect_arch() {
+  arch="$(uname -m | tr '[:upper:]' '[:lower:]')"
+
+  case "${arch}" in
+    amd64) arch="386" ;;
+    armv*) arch="arm" ;;
+    arm64) arch="arm64" ;;
+  esac
+
+  if [ "${arch}" = "arm64" ] && [ "$(getconf LONG_BIT)" -eq 32 ]; then
+    arch=arm
+  fi
+
+  printf '%s' "${arch}"
+}
+
+
+detect_platform() {
+  platform="$(uname -s | tr '[:upper:]' '[:lower:]')"
+
+  case "${platform}" in
+    linux) platform="linux" ;;
+    darwin) platform="darwin" ;;
+  esac
+
+  printf '%s' "${platform}"
+}
+
+validate_dependencies
+set_install_directory
+validate_install_directory
+install