feat: add markdown renderer for review documents

src/lib.rs

@@ -2,6 +2,7 @@ pub mod cli;
 pub mod error;
 pub mod model;
 pub mod output;
+pub mod render;
 
 pub fn run() -> anyhow::Result<()> {
     Ok(())

src/render/markdown.rs

@@ -0,0 +1,109 @@
+use crate::model::{CommentThread, PrReviewDocument};
+
+fn backtick_fence(body: &str) -> String {
+    let mut max_run = 0usize;
+    let mut current_run = 0usize;
+
+    for ch in body.chars() {
+        if ch == '`' {
+            current_run += 1;
+            max_run = max_run.max(current_run);
+        } else {
+            current_run = 0;
+        }
+    }
+
+    let fence_len = std::cmp::max(3, max_run + 1);
+    "`".repeat(fence_len)
+}
+
+fn render_body(body: &str) -> String {
+    let fence = backtick_fence(body);
+    format!("{fence}md\n{body}\n{fence}\n")
+}
+
+fn render_thread(thread_index: usize, thread: &CommentThread) -> String {
+    let mut out = String::new();
+    out.push_str(&format!("### Comment {}.1\n", thread_index));
+    if let Some(file_path) = &thread.file_path {
+        if let Some(line) = thread.line {
+            out.push_str(&format!("{file_path}:{line}\n"));
+        } else {
+            out.push_str(&format!("{file_path}\n"));
+        }
+    }
+    out.push_str(&format!("{}:\n", thread.root_comment.user));
+    out.push_str(&render_body(&thread.root_comment.body));
+
+    for (reply_index, reply) in thread.replies.iter().enumerate() {
+        let reply_number = format!("{thread_index}.1.{}", reply_index + 1);
+        out.push_str(&format!("\n### Reply {reply_number}\n"));
+        out.push_str(&format!("{}:\n", reply.user));
+        out.push_str(&render_body(&reply.body));
+    }
+
+    out
+}
+
+pub fn render_markdown(doc: &PrReviewDocument) -> String {
+    let mut out = String::new();
+
+    out.push_str(&format!(
+        "# {} `#{}` {}\n\n",
+        doc.meta.repo, doc.meta.pr_index, doc.meta.title
+    ));
+
+    out.push_str("## Metadata\n\n");
+    out.push_str(&format!("- state: {}\n", doc.meta.state));
+    out.push_str(&format!("- author: {}\n", doc.meta.author));
+    out.push_str(&format!("- base branch: {}\n", doc.meta.base_branch));
+    out.push_str(&format!("- head branch: {}\n", doc.meta.head_branch));
+    out.push_str(&format!("- created at: {}\n", doc.meta.created_at));
+    out.push_str(&format!("- updated at: {}\n", doc.meta.updated_at));
+    out.push_str(&format!(
+        "- merged at: {}\n",
+        doc.meta.merged_at.as_deref().unwrap_or("null")
+    ));
+    out.push_str("\n");
+
+    out.push_str("## Commits\n\n");
+    for commit in &doc.commits {
+        out.push_str(&format!(
+            "- {} {} ({}, {})\n",
+            commit.short_sha, commit.title, commit.author, commit.date
+        ));
+    }
+    out.push_str("\n");
+
+    out.push_str("## Diff Stat\n\n");
+    out.push_str(&format!(
+        "- files changed: {}\n- additions: {}\n- deletions: {}\n",
+        doc.diff_stat.files_changed, doc.diff_stat.additions, doc.diff_stat.deletions
+    ));
+    for file in &doc.diff_stat.files {
+        out.push_str(&format!(
+            "- {}: +{}, -{}\n",
+            file.path, file.additions, file.deletions
+        ));
+    }
+    out.push_str("\n");
+
+    for (review_index, review) in doc.reviews.iter().enumerate() {
+        out.push_str(&format!(
+            "## Review {} ({})\n\n",
+            review_index + 1,
+            review.state
+        ));
+        out.push_str(&format!("> {}\n\n", review.reviewer));
+        if let Some(submitted_at) = &review.submitted_at {
+            out.push_str(&format!("- submitted at: {}\n\n", submitted_at));
+        }
+    }
+
+    for (thread_index, thread) in doc.threads.iter().enumerate() {
+        out.push_str(&render_thread(thread_index + 1, thread));
+        out.push('\n');
+    }
+
+    out.trim_end().to_string()
+}

src/render/mod.rs

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