cli: Refactor `rad issue open`

Lift the issue editing logic into its own function.

radicle-cli/src/commands/issue.rs

@@ -407,27 +407,35 @@ fn list(
     Ok(())
 }
 
-fn open<G: Signer>(
-    issues: &mut Issues,
-    signer: &G,
-    options: &Options,
-    title: Option<String>,
-    description: Option<String>,
-    tags: Vec<Tag>,
-) -> anyhow::Result<()> {
+fn prompt_issue(
+    title: &str,
+    description: &str,
+    tags: &[Tag],
+    assignees: &[Did],
+) -> anyhow::Result<Option<(Metadata, String)>> {
+    let title = if title.is_empty() {
+        "Enter a title"
+    } else {
+        title
+    };
+    let description = if description.is_empty() {
+        "Enter a description..."
+    } else {
+        description
+    };
+
     let meta = Metadata {
-        title: title.unwrap_or("Enter a title".to_owned()),
-        tags,
-        assignees: vec![],
+        title: title.to_string(),
+        tags: tags.to_vec(),
+        assignees: assignees.to_vec(),
     };
     let yaml = serde_yaml::to_string(&meta)?;
-    let doc = format!(
-        "{}---\n\n{}",
-        yaml,
-        description.unwrap_or("Enter a description...".to_owned())
-    );
+    let doc = format!("{yaml}---\n\n{description}");
+
+    let Some(text) = term::Editor::new().edit(&doc)? else {
+        return Ok(None);
+    };
 
-    if let Some(text) = term::Editor::new().edit(&doc)? {
     let mut meta = String::new();
     let mut frontmatter = false;
     let mut lines = text.lines();
@@ -451,6 +459,26 @@ fn open<G: Signer>(
     let meta: Metadata =
         serde_yaml::from_str(&meta).context("failed to parse yaml front-matter")?;
 
+    Ok(Some((meta, description)))
+}
+
+fn open<G: Signer>(
+    issues: &mut Issues,
+    signer: &G,
+    options: &Options,
+    title: Option<String>,
+    description: Option<String>,
+    tags: Vec<Tag>,
+) -> anyhow::Result<()> {
+    let Some((meta, description)) = prompt_issue(
+        &title.unwrap_or_default(),
+        &description.unwrap_or_default(),
+        &tags,
+        &[],
+    )? else {
+        return Ok(());
+    };
+
     let issue = issues.create(
         &meta.title,
         description.trim(),
@@ -465,7 +493,6 @@ fn open<G: Signer>(
     if !options.quiet {
         show_issue(&issue)?;
     }
-    }
 
     Ok(())
 }