added test for helper function

src/app/builder/asciidoctor.rs

@@ -29,7 +29,7 @@ fn asciidoctor_docs(in_path: &str, out_path: &str) -> process::Command {
 
 fn asciidoctor_slides(in_path: &str, out_path: &str) -> process::Command {
     let mut command = process::Command::new(format!("asciidoctor-revealjs-linux"));
-    let revealjs_path = path_between(out_path, "./dist/slides/revealjs");
+    let revealjs_path = path_between(out_path.to_string(), "./dist/slides/revealjs".to_string());
 
     command
         .arg(format!("{in_path}"))
@@ -38,10 +38,26 @@ fn asciidoctor_slides(in_path: &str, out_path: &str) -> process::Command {
     return command;
 }
 
-fn path_between(from: &str, to: &str) -> &str {
-    let from_segments = from.split("/");
-    let to_segments = to.split("/");
-    let last_common
+fn path_between(from: String, to: String) -> String {
+    let from_segments: Vec<&str> = from.split("/").collect();
+    let to_segments: Vec<&str> = to.split("/").collect();
+    let last_matching_index = last_matching_index(&from_segments, &to_segments);
+    let number_of_backs = from_segments.len() - last_matching_index;
+    return "".to_string();
+}
+
+pub fn last_matching_index(from_segments: &Vec<&str>, to_segments: &Vec<&str>) -> usize {
+    for (index, from_segment) in from_segments.iter().enumerate() {
+        if let Some(to_segment) = to_segments.get(index){
+            if  from_segment != to_segment  {
+                return index - 1;
+            }
+        } else {
+            return index - 1;
+        }
+    }
+
+    return from_segments.len();
 }
 
 pub struct AsciiDoctorDocsBuilder;

src/test/builder/asciidoctor.rs

@@ -0,0 +1,19 @@
+use crate::app::builder::asciidoctor;
+
+#[test]
+fn last_matching_index_0() {
+    let vec1 = vec!["dings", "dings", "dingens"];
+    let vec2 = vec!["dings", "dings", "dings"];
+
+    let last_maching = asciidoctor::last_matching_index(&vec1, &vec2);
+    assert_eq!(last_maching, 1);
+}
+
+#[test]
+fn last_matching_index_1() {
+    let vec1 = vec!["dings", "dings", "dingens", "dings", "dingens"];
+    let vec2 = vec!["dings", "dings", "dingens", "dings"];
+
+    let last_maching = asciidoctor::last_matching_index(&vec1, &vec2);
+    assert_eq!(last_maching, 3);
+}

src/test/builder/mod.rs

@@ -0,0 +1 @@
+pub mod asciidoctor;