ARROW-4071: [Rust] Add rustfmt as a pre-commit hook

Author: Nicolas Trinquier <[email protected]> Closes apache#3753 from ntrinquier/ARROW-4071 and squashes the following commits: ecdf6e3 <Nicolas Trinquier> Add pre-commit hook to check formatting
abandy · Mar 1, 2019 · b536457 · b536457
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commit b536457
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diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
@@ -29,6 +29,14 @@ repos:
         entry: bash -c "git archive HEAD --prefix=apache-arrow/ --output=arrow-src.tar && ./dev/release/run-rat.sh arrow-src.tar"
         always_run: true
         pass_filenames: false
+      - id: rustfmt
+        name: rustfmt
+        language: system
+        entry: bash -c "cd rust && cargo +stable fmt --all -- --check"
+        files: ^rust/.*\.rs$
+        types:
+          - file
+          - rust
   - repo: git://github.com/pre-commit/pre-commit-hooks
     sha: v1.2.3
     hooks:

diff --git a/rust/README.md b/rust/README.md
@@ -59,4 +59,3 @@ and check for lint issues:
 ```bash
 cargo +stable fmt --all -- --check
 ```
-
Original file line number	Diff line number	Diff line change
Expand Up		@@ -59,4 +59,3 @@ and check for lint issues:
		```bash
		cargo +stable fmt --all -- --check
		```