Add command installed check

Author: evertramos

system/system-check-command-installed.sh

@@ -0,0 +1,47 @@
+#-----------------------------------------------------------------------
+#
+# Basescript function
+#
+# The basescript functions were designed to work as abstract function,
+# so it could be used in many different contexts executing specific job
+# always remembering Unix concept DOTADIW - "Do One Thing And Do It Well"
+#
+# Developed by
+#   Evert Ramos <evert.ramos@gmail.com>
+#
+# Copyright Evert Ramos
+#
+#-----------------------------------------------------------------------
+#
+# Be careful when editing this file, it is part of a bigger script!
+#
+# Basescript - https://github.com/evertramos/basescript
+#
+#-----------------------------------------------------------------------
+
+#-----------------------------------------------------------------------
+# This function has one main objective:
+# 1. Check if a command is installed 
+#
+# You must/might inform the parameters below:
+# 1. Command name
+#
+#-----------------------------------------------------------------------
+
+system_check_command_installed()
+{
+    local LOCAL_COMMAND
+     
+    LOCAL_COMMAND=${1:-null}
+
+    [[ $LOCAL_COMMAND == "" ]] && echoerror "You must inform the COMMAND NAME to the function: '${FUNCNAME[0]}'"
+ 
+    [[ "$DEBUG" == true ]] && echo "Checking if command '$LOCAL_COMMAND' is installed."
+
+    if [[ ! -x "$(command -v "$LOCAL_COMMAND")" ]]; then
+        COMMAND_IS_INSTALLED=true 
+    else
+        COMMAND_IS_INSTALLED=false
+    fi
+}
+