From 78230815814ee4f4e8af4c1ad72b83b1ede242d0 Mon Sep 17 00:00:00 2001
From: NerdyPepper <akshayoppiliappan@gmail.com>
Date: Tue, 21 May 2019 22:48:40 +0530
Subject: add commit distance indicator

---
 src/vcs.rs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/vcs.rs b/src/vcs.rs
index 8d493de..5201886 100644
--- a/src/vcs.rs
+++ b/src/vcs.rs
@@ -21,6 +21,17 @@ pub fn vcs_status() -> Option<(colored::ColoredString, colored::ColoredString)>
         return None
     }
     let repo = repo.unwrap();
+
+    let mut commit_dist: String = "".into();
+    if let Some((ahead, behind)) = get_ahead_behind(&repo) {
+        if ahead > 0 {
+            commit_dist.push_str(" ↑");
+        }
+        if behind > 0 {
+            commit_dist.push_str(" ↓");
+        }
+    }
+
     let reference = match repo.head() {
         Ok(r) => r,
         Err(_) => return None
@@ -71,3 +82,19 @@ pub fn vcs_status() -> Option<(colored::ColoredString, colored::ColoredString)>
     }
     return Some((branch, repo_stat))
 }
+
+fn get_ahead_behind(r: &Repository) -> Option<(usize, usize)> {
+  let head = (r.head().ok())?;
+  if !head.is_branch() {
+    return None
+  }
+
+  let head_name    = (head.shorthand())?;
+  let head_branch  = (r.find_branch(head_name, git2::BranchType::Local).ok())?;
+  let upstream     = (head_branch.upstream().ok())?;
+  let head_oid     = (head.target())?;
+  let upstream_oid = (upstream.get().target())?;
+
+  r.graph_ahead_behind(head_oid, upstream_oid).ok()
+}
+
-- 
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