*readd* install.sh file

scripts/install.sh

@@ -0,0 +1,185 @@
+#!/usr/bin/env bash
+# shellcheck disable=SC2059
+
+set -eo pipefail
+
+reset="\033[0m"
+red="\033[31m"
+green="\033[32m"
+yellow="\033[33m"
+cyan="\033[36m"
+white="\033[37m"
+
+letsh_get_binary() {
+  local os
+  case "$(uname -s)" in
+  Darwin)
+    #      printf "${green}> macOS detected$reset\n"
+    os='darwin'
+    ;;
+
+  Linux)
+    #      printf "${green}> Linux detected$reset\n"
+    os='linux'
+    ;;
+
+#  CYGWIN* | MINGW32* | MSYS* | MINGW*)
+#    #      printf "${green}> Windows detected$reset\n"
+#    os='win'
+#    ;;
+
+  *)
+    printf "$red> Unsupported OS.$reset\n"
+    exit 1
+    ;;
+  esac
+
+  printf "$cyan> Downloading binary...$reset\n"
+  if [ "$1" = '--version' ]; then
+    # Validate that the version matches MAJOR.MINOR.PATCH to avoid garbage-in/garbage-out behavior
+    version=$2
+    if echo "$version" | grep -qE "^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$"; then
+      url="https://install.let.sh.cn/cli_${version}_${os}_amd64.tar.gz"
+    else
+      printf "$red> Version number invalid.$reset\n"
+      exit 1
+    fi
+  else
+    version=$(curl -sS https://install.let.sh.cn/version | grep "latest:" | cut -f 2 -d ":")
+    url="https://install.let.sh.cn/cli_${version}_${os}_amd64.tar.gz"
+  fi
+
+  mkdir -p ~/.let/bin
+
+#  if [ $os = 'win' ]; then
+#    url="$url.exe"
+#  fi
+
+  # Get both the tarball and its GPG signature
+  # if curl --fail --progress-bar -L -o ~/.let/bin/lets "$url"; then
+  if curl --fail --progress-bar -L "$url" 2> /dev/null | tar xzvf - -C ~/.let/bin/ > /dev/null 2>&1; then
+    mv ~/.let/bin/let ~/.let/bin/lets
+    printf "$cyan> Chmod-ing file ~/.let/bin/lets...$reset\n"
+    chmod +x ~/.let/bin/lets
+  else
+    printf "$red> Failed to download $url.$reset\n"
+    exit 1
+  fi
+}
+
+letsh_detect_profile() {
+  if [ -n "${PROFILE}" ] && [ -f "${PROFILE}" ]; then
+    echo "${PROFILE}"
+    return
+  fi
+
+  local DETECTED_PROFILE
+  DETECTED_PROFILE=''
+  local SHELLTYPE
+  SHELLTYPE="$(basename "/$SHELL")"
+
+  if [ "$SHELLTYPE" = "bash" ]; then
+    if [ -f "$HOME/.bashrc" ]; then
+      DETECTED_PROFILE="$HOME/.bashrc"
+    elif [ -f "$HOME/.bash_profile" ]; then
+      DETECTED_PROFILE="$HOME/.bash_profile"
+    fi
+  elif [ "$SHELLTYPE" = "zsh" ]; then
+    DETECTED_PROFILE="$HOME/.zshrc"
+  elif [ "$SHELLTYPE" = "fish" ]; then
+    DETECTED_PROFILE="$HOME/.config/fish/config.fish"
+  fi
+
+  if [ -z "$DETECTED_PROFILE" ]; then
+    if [ -f "$HOME/.profile" ]; then
+      DETECTED_PROFILE="$HOME/.profile"
+    elif [ -f "$HOME/.bashrc" ]; then
+      DETECTED_PROFILE="$HOME/.bashrc"
+    elif [ -f "$HOME/.bash_profile" ]; then
+      DETECTED_PROFILE="$HOME/.bash_profile"
+    elif [ -f "$HOME/.zshrc" ]; then
+      DETECTED_PROFILE="$HOME/.zshrc"
+    elif [ -f "$HOME/.config/fish/config.fish" ]; then
+      DETECTED_PROFILE="$HOME/.config/fish/config.fish"
+    fi
+  fi
+
+  if [ -n "$DETECTED_PROFILE" ]; then
+    echo "$DETECTED_PROFILE"
+  fi
+}
+
+letsh_link() {
+  printf "$cyan> Adding to \$PATH...$reset\n"
+  LETSH_PROFILE="$(letsh_detect_profile)"
+  SOURCE_STR="\nexport PATH=\"\$HOME/.let/bin:\$PATH\"\n"
+
+  if [ -z "${LETSH_PROFILE-}" ]; then
+    printf "$red> Profile not found. Tried ${LETSH_PROFILE} (as defined in \$PROFILE), ~/.bashrc, ~/.bash_profile, ~/.zshrc, and ~/.profile.\n"
+    echo "> Create one of them and run this script again"
+    echo "> Create it (touch ${LETSH_PROFILE}) and run this script again"
+    echo "   OR"
+    printf "> Append the following lines to the correct file yourself:$reset\n"
+    command printf "${SOURCE_STR}"
+  else
+    if ! grep -q 'let/bin' "$LETSH_PROFILE"; then
+      if [[ $LETSH_PROFILE == *"fish"* ]]; then
+        # shellcheck disable=SC2016
+        command fish -c 'set -U fish_user_paths $fish_user_paths ~/.let/bin'
+        printf "$cyan> We've added ~/.let/bin to your fish_user_paths universal variable\n"
+      else
+        command printf "$SOURCE_STR" >>"$LETSH_PROFILE"
+        printf "$cyan> We've added the following to your $LETSH_PROFILE\n"
+      fi
+
+      echo "> If this isn't the profile of your current shell then please add the following to your correct profile:"
+      printf "   $SOURCE_STR$reset\n"
+    fi
+
+    version=$($HOME/.let/bin/lets version) || (
+      printf "$red> let.sh was installed, but doesn't seem to be working :(.$reset\n"
+      exit 1
+    )
+
+    printf "$green> Successfully installed let.sh $version! Please open another terminal where the \`lets\` command will now be available.$reset\n"
+  fi
+}
+
+letsh_reset() {
+  unset -f letsh_install letsh_reset letsh_get_binary letsh_link letsh_detect_profile
+}
+
+letsh_install() {
+  printf "${white}Installing let.sh!$reset\n"
+
+  if [ -d "$HOME/.let/bin" ]; then
+    if which lets; then
+      local specified_version
+      if [ "$1" = '--version' ]; then
+        specified_version=$2
+      else
+        specified_version=$(curl -sS https://install.let.sh.cn/version | grep "latest:" | cut -f 2 -d ":")
+      fi
+      letsh_version=$(lets version)
+
+      if [ "$specified_version" = "$letsh_version" ]; then
+        printf "$green> let.sh is already at the $specified_version version.$reset\n"
+        exit 0
+      else
+        printf "$yellow> $letsh_version is already installed, Specified version: $specified_version.$reset\n"
+        rm -rf "$HOME/.let/bin"
+      fi
+    else
+      printf "$red> $HOME/.let/bin already exists, possibly from a past let.sh install.$reset\n"
+      printf "$red> Remove it (rm -rf $HOME/.let/bin) and run this script again.$reset\n"
+      exit 0
+    fi
+  fi
+
+  letsh_get_binary $1 $2
+  letsh_link
+  letsh_reset
+}
+
+cd ~
+letsh_install $1 $2