install

#!/usr/bin/env bash
# shellcheck disable=SC2145
set -euo pipefail
IFS=$'\n\t'
normal=$'\e[0m'
bold=$'\e[1m'
dimmed=$'\e[2m'
red=$'\e[31m'
green=$'\e[92m'
cyan=$'\e[96m'

log() {
  echo "$@" 1>&2
}

info() {
  log "${dimmed}==> $@${normal}"
}

success() {
  log "${cyan}✓ $@${normal}"
}

throw() {
  log " ${red}Error: $@${normal}"
  exit 1
}

yn() {
  # shellcheck disable=SC2064
  trap "echo $normal" SIGINT
  read -r -n 1 -p "${green}${bold}?${normal} $1 [y/n]: ${cyan}${bold}" yn
  echo "${normal}"
  trap - SIGINT
  if [[ "$yn" != [Yy]* ]]; then
    return 1
  fi
}

# ==========================
# Install icsp
# ==========================
REPO_ZIP_DOWNLOAD_URL="https://github.com/loteoo/icsp/archive/refs/heads/main.zip"
BIN_HOME="${XDG_BIN_HOME:-$HOME/.local/bin}"
SCRIPT_NAME="icsp"
INSTALL_PATH="$BIN_HOME/$SCRIPT_NAME-main"
SCRIPT_FILE_PATH="$INSTALL_PATH/$SCRIPT_NAME"
SYMLINK_PATH="$BIN_HOME/$SCRIPT_NAME"


## Validation steps
## ==================

# Validate dependencies
for dependency in curl unzip awk date sed tr; do
  if ! command -v $dependency &> /dev/null; then
    throw "\"$dependency\" command is not available. Installation aborted."
  fi
done

# Warn reinstall if already installed
if  [[ -f "$SYMLINK_PATH" || -d "$INSTALL_PATH" || -n "$(which $SCRIPT_NAME)" ]]; then
  if ! yn "$SCRIPT_NAME already exists. Uninstall before reinstall?"; then
    throw "Installation aborted."
  fi
  if [[ -f "$SYMLINK_PATH" ]]; then
    info "Remove symlink..."
    rm "$SYMLINK_PATH"
  fi
  if [[ -d "$INSTALL_PATH" ]]; then
    info "Remove script files..."
    rm -r "$INSTALL_PATH"
  fi
  if [[ -n "$(which $SCRIPT_NAME)" ]]; then
    info "Remove previous installation..."
    rm "$(which $SCRIPT_NAME)"
  fi
  success "Uninstalled $SCRIPT_NAME."
fi

# Confirm install
if ! yn "Install $SCRIPT_NAME?"; then
  throw "Installation aborted."
fi

# Create bin directory if needed.
if [[ ! -d "$BIN_HOME" ]]; then
  if ! yn "Create \"$BIN_HOME\" directory?"; then
    throw "Installation aborted."
  fi

  info "Create \"$BIN_HOME\"..."
  mkdir -p "$BIN_HOME"

  # Add to bin directory to $PATH if needed.
  if ! echo "$PATH" | tr ':' $'\n' | grep -q "$BIN_HOME"; then
    profile_file=".bashrc"
    if [[ -f "$HOME/.zshrc" ]]; then
      profile_file=".zshrc"
    fi
    if ! yn "\"$BIN_HOME\" is not in \$PATH. Add to path via $profile_file?"; then
      throw "Installation aborted."
    fi
    bash -c "echo 'export PATH=\$PATH:$BIN_HOME' >> $HOME/$profile_file"
    info "\"$BIN_HOME\" was added to \$PATH. Shell session restart required."
  fi
  success "Created \"$BIN_HOME\" directory."
fi


## Install steps
## ==================

info "Downloading $REPO_ZIP_DOWNLOAD_URL..."
curl -fsSL "$REPO_ZIP_DOWNLOAD_URL" -o "$INSTALL_PATH.zip"

info "Unpacking to $INSTALL_PATH..."
unzip -q "$INSTALL_PATH.zip" -d "$BIN_HOME"

info "Delete archive..."
rm "$INSTALL_PATH.zip"

info "Make script executable..."
chmod +x "$SCRIPT_FILE_PATH"

info "Create symbolic link at $SYMLINK_PATH..."
ln -s "$SCRIPT_FILE_PATH" "$SYMLINK_PATH"


## Post-install
## ==================

success "$SCRIPT_NAME installed! 🎉"
log "Give $SCRIPT_NAME it a star on Github if you like it! 🙏"

if [[ -z "$(which "$SCRIPT_NAME")" ]]; then
  log "Please restart your terminal to make $SCRIPT_NAME available."
  exit
fi

info "Running \"$SCRIPT_NAME -h\"..."
eval "$SCRIPT_NAME -h"