Refactor build.sh and add support for different platforms

Signed-off-by: somebody_master <somebody_master@somebodyserver.mooo.com>

build/build.sh

@@ -1,20 +1,62 @@
 #!/usr/bin/env bash
+# Export to make android build and clean work
+export ANDROID_NDK_ROOT="$HOME/.android-sdk/ndk/23.2.8568313"
 
+# Folders
+_build_folder="gdextension"
+
+# Error variables
+_error_build_folder="${_build_folder} doesn't exist"
+_error_no_option="\nYou have to indicate an option"
+
+# Platform variables
+_platform_linux="platform=linux"
+_platform_windows="platform=windows"
+_platform_android="platform=android"
+
+# Clean variables and exit
+function clean_exit() {
+
+    if [ -v 2 ]; then
+        echo -e "$2"
+        unset 2
+    fi
+
+    unset _platform_android
+    unset _platform_windows
+    unset _platform_linux
+
+    unset _error_no_option
+    unset _error_build_folder
+
+    unset _build_folder
+
+    unset ANDROID_NDK_ROOT
+    exit "$1"
+}
+
+# Clean compilations
 function clean() {
-    cd gdextension || return 1
+    cd "$_build_folder" || clean_exit 1 "$_error_build_folder"
-    scons --clean
+    scons "$_platform_linux" --clean
+    scons "$_platform_windows" --clean
+    scons "$_platform_android" --clean
     cd ..
 }
 
+# Build by passing the platform as a variable
 function build() {
-    cd gdextension || return 1
+    cd "$_build_folder" || clean_exit 1 "$_error_build_folder"
-    scons
+    scons "$1" target=template_release
+    scons "$1" target=template_debug
+    unset 1
     cd ..
 }
 
+# Analize build process to create compile_commands.json
 function build_db() {
     clean
-    cd gdextension || return 1
+    cd "$_build_folder" || clean_exit 1 "$_error_build_folder"
     bear -- scons
 
     if [ ! -d ../build ]; then
@@ -31,16 +73,64 @@ function build_db() {
     cd ..
 }
 
-while getopts "bdch" flag; do
+# Display the help
+function Help() {
+    echo -e "Compiles gdextension using scons\n"
+    echo -e "Syntax: build [-b|d|c|a|l|w|A|h]"
+    echo -e "Options:"
+    echo -e "\t-b for build default"
+    echo -e "\t-d for generating a compile_commands.json"
+    echo -e "\t-c for cleaning"
+    echo -e "\t-a for building for Android"
+    echo -e "\t-l for building for Linux"
+    echo -e "\t-w for building for Windows"
+    echo -e "\t-A for building all"
+    echo -e "\t-h for displaying this help"
+}
+
+while getopts "bdchawlA" flag; do
     case "$flag" in
-        d) build_db && exit 0 ;;
+        A) # Builds for all platforms
-        b) build && exit 0 ;;
+            build "$_platform_linux"
-        c) clean ;;
+            build "$_platform_windows"
-        h) echo "Use -b for build , -d for generating a compile_commands.json or -c for cleaning" ;;
+            build "$_platform_android"
-        ?)
+            clean_exit 0
-            echo "script usage: $(basename \$0) [-b] [-d] [-c] [-h]" >&2
+            ;;
-            exit 1
+        a) # Build for android
+            build "$_platform_android"
+            clean_exit 0
+            ;;
+        w) # Build for windows
+            build "$_platform_windows"
+            clean_exit 0
+            ;;
+        l) # Build for linux
+            build "$_platform_linux"
+            clean_exit 0
+            ;;
+        d) # Generate compile_commands.json
+            build_db
+            clean_exit 0
+            ;;
+        b) # Default build
+            build
+            clean_exit 0
+            ;;
+        c) # Clean compilations
+            clean
+            clean_exit 0
+            ;;
+        h) # Invoque help
+            Help
+            clean_exit 0
+            ;;
+        \?) # Erroneus call
+            Help
+            dirty_exit 0
             ;;
     esac
 done
-exit 0
+
+# In case there is no option pass
+Help
+clean_exit 1 "$_error_no_option"