feat: Implement common utility functions in common.bash

Author: WhiteHyun

scripts/common.bash

@@ -0,0 +1,104 @@
+#!/usr/bin/env bash
+
+source scripts/languages.bash
+
+# Load environment variables from .env file
+function load_env_vars() {
+  if [ -f .env ]; then
+    # shellcheck disable=SC2046
+    export echo $(sed <.env 's/#.*//g' | xargs | envsubst)
+
+    # Check if required variables are set and not equal to default values
+    if [ "$NICKNAME" = "your_nickname" ] || [ "$LANGUAGE" = "choose_your_language" ]; then
+      echo "Error: Required environment variables are set to default values."
+      echo "Please update NICKNAME and LANGUAGE in the .env file with appropriate values."
+      exit 1
+    fi
+
+    # Check if the specified language is valid
+
+    if [[ ! "${!language_extensions[@]}" =~ $LANGUAGE ]]; then
+      echo "Error: Invalid language specified in the .env file."
+      echo "Please set LANGUAGE to one of the following valid languages:"
+      echo "${!language_extensions[@]}"
+      exit 1
+    fi
+  fi
+}
+
+# Check if a command is installed
+function check_command() {
+  local command="$1"
+  if ! command -v "$command" &>/dev/null; then
+    echo "The $command command is not installed."
+    read -r -p "Do you want to install $command? (Y/n): " install_command
+    case "$install_command" in
+    [nN] | [nN][oO])
+      echo "Installation of $command has been rejected. Exiting the script."
+      exit 1
+      ;;
+    *)
+      echo "Proceeding with the installation of $command..."
+      brew install "$command"
+      ;;
+    esac
+  fi
+}
+
+# Generates the solution code template with question details and author information
+function make_solution_code() {
+  local question_id=$1
+  local question_name=$2
+  local question_url=$3
+  local code=$4
+  local comment=${language_comments[$LANGUAGE]}
+  local nickname
+  if [ -n "$NICKNAME" ]; then
+    nickname=$NICKNAME
+  else
+    nickname=Unknown
+  fi
+  local content
+  content=$(
+    cat <<EOF
+${comment}
+${comment}$question_id. $question_name
+${comment}$question_url
+${comment}Dale-Study
+${comment}
+${comment}Created by $nickname on $(date "+%Y/%m/%d").
+${comment}
+
+$code
+
+EOF
+  )
+  echo "$content"
+}
+
+# Saves the solution code to a file in the appropriate directory based on the question slug and author's nickname
+function save_file() {
+  local DIR
+  local title_slug="$1"
+  local content="$2"
+  local nickname
+  local language_extension
+  local solution_folder
+  local solution_file
+
+  if [ -n "$NICKNAME" ]; then
+    nickname=$NICKNAME
+  else
+    nickname=Unknown
+  fi
+
+  DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
+  language_extension=${language_extensions[$LANGUAGE]}
+
+  solution_folder="$DIR/../$title_slug"
+  mkdir -p "$solution_folder"
+
+  solution_file="$solution_folder/$nickname.$language_extension"
+  echo "$content" >"$solution_file"
+  echo "File creation completed"
+}