refactored install_os_dependencies.sh

add .idea on .gitignore

.gitignore

@@ -3,3 +3,4 @@
 *.pyc
 local_settings.py
 repo_name
+.idea

{{cookiecutter.repo_name}}/install_os_dependencies.sh

@@ -1,20 +1,82 @@
 #!/bin/bash
 
-if [[ $EUID -ne 0 ]]; then
+OS_REQUIREMENTS_FILENAME="requirements.apt"
+
+# Handle call with wrong command
+function wrong_command()
+{
+  echo "${0##*/} - unknown command: '${1}'"
+  usage_message
+}
+
+# Print help / script usage
+function usage_message()
+{
+  echo "usage: ./${0##*/} <command>"
+  echo "available commands are:"
+  echo -e "\tlist\t\tPrint a list of all packages defined on ${OS_REQUIREMENTS_FILENAME} file"
+  echo -e "\thelp\t\tPrint this help"
+  echo -e "\n\tCommands that require superuser permission:"
+  echo -e "\tinstall\t\tInstall packages defined on ${OS_REQUIREMENTS_FILENAME} file. Note: This\n\t\t\t   does not upgrade the packages already installed for new\n\t\t\t   versions, even if new version is available in the repository."
+  echo -e "\tupgrade\t\tSame that install, but upgrate the already installed packages,\n\t\t\t   if new version is available."
+
+}
+
+# Read the requirements.apt file, and remove comments and blank lines
+function list_packages(){
+     cat ${OS_REQUIREMENTS_FILENAME} | grep -v "#" | grep -v "^$";
+}
+
+function install()
+{
+    list_packages | xargs apt-get --no-upgrade install -y;
+}
+
+function upgrade()
+{
+    list_packages | xargs apt-get install -y;
+}
+
+
+function install_or_upgrade()
+{
+    P=${1}
+    PARAN=${P:-"install"}
+
+    if [[ $EUID -ne 0 ]]; then
         echo -e "\nYou must run this with root privilege" 2>&1
         echo -e "Please do:\n" 2>&1
-    echo "sudo ./${0##*/}" 2>&1
+        echo "sudo ./${0##*/} $PARAN" 2>&1
         echo -e "\n" 2>&1
 
         exit 1
-else
+    else
 
         apt-get update
 
         # Install the basic compilation dependencies and other required libraries of this project
-    cat requirements.apt | grep -v "#" | xargs sudo apt-get install -y
+        if [ "$PARAN" == "install" ]; then
+            install;
+        else
+            upgrade;
+        fi
 
         # cleaning downloaded packages from apt-get cache
         apt-get clean
 
-fi
+        exit 0
+    fi
+
+
+}
+
+
+# Handle command argument
+case "$1" in
+    install) install_or_upgrade;;
+    upgrade) install_or_upgrade "upgrade";;
+    list) list_packages;;
+    help) usage_message;;
+    *) wrong_command $1;;
+esac
+