Revert "Suggestion.diff_command: Diff an index instead of a file"

This reverts commit 588cd526fd78b3a0e0ec1dfb9fc194ca385de902.

Since each suggestion has its own associated commit, we can't compare a
tree and a single commit. We'll probably have to invoke `git diff` once
for each suggestion.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/bin/git-sugdiff.rs b/src/bin/git-sugdiff.rs
index 362eb15..9c7ff1f 100644
--- a/src/bin/git-sugdiff.rs
+++ b/src/bin/git-sugdiff.rs
@@ -43,12 +43,12 @@ fn main() {
         &config,
         |suggestion| {
             // TODO: Needs to work for multiple suggestions at once
-            let tree = suggestion.diff_command().unwrap();
+            let blob = suggestion.diff_command().unwrap();
 
             Command::new("git")
                 .arg("diff")
-                .arg(suggestion.commit())
-                .arg(tree.to_string())
+                .arg(format!("{}:{}", suggestion.commit(), suggestion.path()))
+                .arg(blob.to_string())
                 .spawn()
                 .unwrap();
         },