GitLab, Azure DevOps, and Bitbucket support

[haasonsaas]

Problem

DiffScope is GitHub-only for its Git platform integration (PR comments, GitHub App auth, webhook support). This is a hard blocker for enterprises running GitLab, Azure DevOps, or Bitbucket. Qodo Merge supports all four platforms and uses this as a direct competitive wedge.

Proposed Solution

Phase 1: GitLab

• GitLab Merge Request API for posting inline comments
• GitLab webhook receiver for MR events
• GitLab OAuth/PAT authentication
• .gitlab-ci.yml example

Phase 2: Bitbucket

• Bitbucket PR API for inline comments
• Bitbucket App authentication
• bitbucket-pipelines.yml example

Phase 3: Azure DevOps

• Azure DevOps PR API for inline comments (threads)
• Azure DevOps service hook for PR events
• Azure Pipelines YAML example

Architecture

• Abstract the Git platform behind a trait:

  trait GitPlatform {
      async fn post_inline_comment(&self, file: &str, line: u32, body: &str) -> Result<()>;
      async fn post_summary_comment(&self, body: &str) -> Result<()>;
      async fn get_pr_diff(&self, pr_id: &str) -> Result<String>;
      async fn get_pr_files(&self, pr_id: &str) -> Result<Vec<ChangedFile>>;
  }

• Current GitHub implementation moves behind this trait
• Platform auto-detected from git remote URL or explicit --platform flag

Competitive Context

Tool	GitHub	GitLab	Azure DevOps	Bitbucket
CodeRabbit	✅	✅	✅	✅
Qodo Merge	✅	✅	✅	✅
Bito	✅	✅	✅ (planned)	✅
Sourcery	✅	✅	❌	❌
DiffScope	✅	❌	❌	❌

Priority

Tier 3 — Enterprise requirement. GitLab alone would unlock a large segment.