Enhance issue handling by adding utils module

Introduce `append_related_issues` function and `IssueRelated` enum to manage related issue linking. Update Gitea action to utilize the new functionality for appending related issues in work package content. Add corresponding tests.

src/gitea/action.rs

@@ -7,6 +7,7 @@ use crate::openproject::user::{GetMe, User};
 use crate::openproject::work::WorkPackageWriter;
 use crate::planning::Issue2WorkActionTrait;
 use url::Url;
+use crate::planning::utils::{append_related_issues, IssueRelated};
 
 pub(crate) struct GiteaAction {}
 
@@ -37,6 +38,9 @@ impl Issue2WorkActionTrait for GiteaAction {
             config.openproject.base_url, args.project_id, work_package.id
         );
 
+        let content = append_related_issues(&IssueRelated::OpenProjectIssue(url.to_string()), &issue.body);
+
+
         println!(
             "new work package created: {:?}, edit at {}",
             work_package.subject, url

src/planning/mod.rs

@@ -4,6 +4,7 @@ use crate::error::GeneralError;
 use url::Url;
 
 pub(crate) mod issue2work;
+pub mod utils;
 
 pub trait Issue2WorkActionTrait {
     async fn run(&self, url: &Url, config: &Config, args: &Issue2Work) -> Result<(), GeneralError>;

src/planning/utils.rs

@@ -0,0 +1,180 @@
+pub enum IssueRelated {
+    OpenProjectIssue(String),
+}
+
+pub fn append_related_issues(issue: &IssueRelated, content: &String) -> String {
+    let mut splitted = content.lines();
+    let mut new_content: Vec<String> = Vec::new();
+
+    let mut found = false;
+    let mut iteration_started = false;
+    while let Some(line) = splitted.next() {
+        if line.contains("## Related issues") {
+            found = true;
+            new_content.push(line.parse().unwrap());
+            // we go to the end of the section
+            while let Some(line) = splitted.next() {
+                if line.starts_with("-") || line.starts_with("*") {
+                    iteration_started = true;
+                    new_content.push(line.parse().unwrap());
+                } else if (line.trim().is_empty()) && iteration_started {
+                    new_content.append(&mut add_related_issues_section(issue));
+                    iteration_started = false;
+                    found = true;
+                    new_content.push(line.parse().unwrap());
+                    break;
+                } else if line.starts_with("#") {
+                    new_content.push("new title found".to_string());
+                    found = true;
+                    new_content.append(&mut add_related_issues_section(issue));
+                    new_content.push("".to_string());
+                    new_content.push(line.parse().unwrap());
+                    break;
+                } else {
+                    new_content.push(line.parse().unwrap());
+                }
+            }
+        } else {
+            new_content.push(line.parse().unwrap());
+        }
+    }
+    if !found || iteration_started {
+        if !found {
+            new_content.append(&mut add_related_issues_title());
+        }
+        new_content.append(&mut add_related_issues_section(issue));
+    }
+
+    new_content.join(&"\n")
+}
+
+fn add_related_issues_title() -> Vec<String> {
+    let mut previous: Vec<String> = Vec::new();
+    previous.push("".to_string());
+    previous.push("## Related issues".to_string());
+    previous.push("".to_string());
+    previous
+}
+
+fn add_related_issues_section(issue: &IssueRelated) -> Vec<String> {
+    let mut previous: Vec<String> = Vec::new();
+    previous.push(convert_issue_link_items(issue));
+
+    previous
+}
+
+fn convert_issue_link_items(issue: &IssueRelated) -> String {
+    match issue {
+        IssueRelated::OpenProjectIssue(issue_url) => format!("- [{}]({})", issue_url, issue_url),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::planning::utils::{append_related_issues, IssueRelated};
+
+    #[test]
+    pub fn test_append_related_issues_content_empty() {
+        let issue = IssueRelated::OpenProjectIssue("https://example/wp/1".to_string());
+        assert_eq!(
+            r#"
+## Related issues
+
+- [https://example/wp/1](https://example/wp/1)"#,
+            append_related_issues(&issue, &("".to_string()))
+        );
+    }
+
+    #[test]
+    pub fn test_append_related_issues_content_not_empty() {
+        let issue = IssueRelated::OpenProjectIssue("https://example/wp/1".to_string());
+        assert_eq!(
+            r#"Something happens.
+
+## Some title
+
+Some content
+
+## Related issues
+
+- [https://example/wp/1](https://example/wp/1)"#,
+            append_related_issues(
+                &issue,
+                &"Something happens.\n\
+\n\
+## Some title\n\
+\n\
+Some content"
+                    .to_string()
+            ),
+        );
+    }
+
+    #[test]
+    pub fn test_append_related_issues_existing_section_related_issues() {
+        let issue = IssueRelated::OpenProjectIssue("https://example/wp/1".to_string());
+        assert_eq!(
+            r#"Something happens.
+
+## Some title
+
+Some content
+
+## Related issues
+
+- [https://example/wp/2](https://example/wp/2)
+- [https://example/wp/1](https://example/wp/1)"#,
+            append_related_issues(
+                &issue,
+                &r#"Something happens.
+
+## Some title
+
+Some content
+
+## Related issues
+
+- [https://example/wp/2](https://example/wp/2)"#
+                    .to_string()
+            ),
+        );
+    }
+
+    #[test]
+    pub fn test_append_related_issues_existing_section_related_issues_not_last() {
+        let issue = IssueRelated::OpenProjectIssue("https://example/wp/1".to_string());
+        assert_eq!(
+            r#"Something happens.
+
+## Some title
+
+Some content
+
+## Related issues
+
+- [https://example/wp/2](https://example/wp/2)
+- [https://example/wp/1](https://example/wp/1)
+
+## Other content
+
+Some other content"#,
+            append_related_issues(
+                &issue,
+                &r#"Something happens.
+
+## Some title
+
+Some content
+
+## Related issues
+
+- [https://example/wp/2](https://example/wp/2)
+
+## Other content
+
+Some other content"#
+                    .to_string()
+            ),
+        );
+    }
+}