fix: Make sure the plc json path is relative (#972)

When building a project from a given json file, make sure the json file
is absolute.

Refs: #971

Author: ghaith

compiler/plc_driver/src/lib.rs

@@ -272,6 +272,14 @@ fn get_project(compile_parameters: &CompileParameters) -> Result<Project<PathBuf
         let config = command
             .get_build_configuration()
             .map(PathBuf::from)
+            .map(|it| {
+                if it.is_relative() {
+                    //Make the build path absolute
+                    current_dir.join(it)
+                } else {
+                    it
+                }
+            })
             .or_else(|| get_config(&current_dir))
             .ok_or_else(|| Diagnostic::param_error("Could not find 'plc.json'"))?;
         Project::from_config(&config)

examples/prog/build/ProjectName.out

@@ -0,0 +1,3 @@
+FUNCTION main : DINT
+	main := 10;
+END_FUNCTION

examples/prog/main.st

@@ -0,0 +1,9 @@
+{
+		"name": "ProjectName",
+    "files" : [
+			"./main.st"
+    ],
+    "compile_type" : "Static",
+    "libraries" : [
+    ]
+}