Read a blob from a repository

Work out the code required to get a file blob's contents from a Git
repository using the 'git2' crate.

We'll be using this to get the original file for patching.

3 files changed, 180 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index bb425da..3cad2f3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -81,6 +81,9 @@ name = "cc"
 version = "1.0.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f9a06fb2e53271d7c279ec1efea6ab691c35a2ae67ec0d91d7acec0caf13b518"
+dependencies = [
+ "jobserver",
+]
 
 [[package]]
 name = "cfg-if"
@@ -227,6 +230,7 @@ checksum = "aaf91faf136cb47367fa430cd46e37a788775e7fa104f8b4bcb3861dc389b724"
 name = "git-suggested-patch"
 version = "0.0.1"
 dependencies = [
+ "git2",
  "github-rs",
  "regex",
  "serde",
@@ -236,6 +240,21 @@ dependencies = [
 ]
 
 [[package]]
+name = "git2"
+version = "0.13.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6ac22e49b7d886b6802c66662b12609452248b1bc9e87d6d83ecea3db96f557"
+dependencies = [
+ "bitflags",
+ "libc",
+ "libgit2-sys",
+ "log",
+ "openssl-probe",
+ "openssl-sys",
+ "url",
+]
+
+[[package]]
 name = "github-rs"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -363,6 +382,17 @@ dependencies = [
 ]
 
 [[package]]
+name = "idna"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02e2673c30ee86b5b96a9cb52ad15718aa1f966f5ab9ad54a8b95d5ca33120a9"
+dependencies = [
+ "matches",
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
+[[package]]
 name = "indexmap"
 version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -388,6 +418,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc6f3ad7b9d11a0c00842ff8de1b60ee58661048eb8049ed33c73594f359d7e6"
 
 [[package]]
+name = "jobserver"
+version = "0.1.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c71313ebb9439f74b00d9d2dcec36440beaf57a6aa0623068441dd7cd81a7f2"
+dependencies = [
+ "libc",
+]
+
+[[package]]
 name = "kernel32-sys"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -410,6 +449,46 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a9f8082297d534141b30c8d39e9b1773713ab50fdbe4ff30f750d063b3bfd701"
 
 [[package]]
+name = "libgit2-sys"
+version = "0.12.9+1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b33bf3d9d4c45b48ae1ea7c334be69994624dc0a69f833d5d9f7605f24b552b"
+dependencies = [
+ "cc",
+ "libc",
+ "libssh2-sys",
+ "libz-sys",
+ "openssl-sys",
+ "pkg-config",
+]
+
+[[package]]
+name = "libssh2-sys"
+version = "0.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eafa907407504b0e683786d4aba47acf250f114d37357d56608333fd167dd0fc"
+dependencies = [
+ "cc",
+ "libc",
+ "libz-sys",
+ "openssl-sys",
+ "pkg-config",
+ "vcpkg",
+]
+
+[[package]]
+name = "libz-sys"
+version = "1.0.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2eb5e43362e38e2bca2fd5f5134c4d4564a23a5c28e9b95411652021a8675ebe"
+dependencies = [
+ "cc",
+ "libc",
+ "pkg-config",
+ "vcpkg",
+]
+
+[[package]]
 name = "lock_api"
 version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -428,6 +507,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "matches"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
+
+[[package]]
 name = "maybe-uninit"
 version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -527,6 +612,25 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ab52be62400ca80aa00285d25253d7f7c437b7375c4de678f5405d3afe82ca5"
 
 [[package]]
+name = "openssl-probe"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77af24da69f9d9341038eba93a073b1fdaaa1b788221b00a69bce9e762cb32de"
+
+[[package]]
+name = "openssl-sys"
+version = "0.9.58"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a842db4709b604f0fe5d1170ae3565899be2ad3d9cbc72dedc789ac0511f78de"
+dependencies = [
+ "autocfg",
+ "cc",
+ "libc",
+ "pkg-config",
+ "vcpkg",
+]
+
+[[package]]
 name = "parking_lot"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -553,6 +657,18 @@ dependencies = [
 ]
 
 [[package]]
+name = "percent-encoding"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
+
+[[package]]
+name = "pkg-config"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d36492546b6af1463394d46f0c834346f31548646f6ba10849802c9c9a27ac33"
+
+[[package]]
 name = "proc-macro2"
 version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -792,6 +908,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "tinyvec"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53953d2d3a5ad81d9f844a32f14ebb121f50b650cd59d0ee2a07cf13c617efed"
+
+[[package]]
 name = "tokio"
 version = "0.1.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1022,6 +1144,24 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "59547bce71d9c38b83d9c0e92b6066c4253371f15005def0c30d9657f50c7642"
 
 [[package]]
+name = "unicode-bidi"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49f2bd0c6468a8230e1db229cff8029217cf623c767ea5d60bfbd42729ea54d5"
+dependencies = [
+ "matches",
+]
+
+[[package]]
+name = "unicode-normalization"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fb19cf769fa8c6a80a162df694621ebeb4dafb606470b2b2fce0be40a98a977"
+dependencies = [
+ "tinyvec",
+]
+
+[[package]]
 name = "unicode-xid"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1045,6 +1185,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55cd1f4b4e96b46aeb8d4855db4a7a9bd96eeeb5c6a1ab54593328761642ce2f"
 
 [[package]]
+name = "url"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "829d4a8476c35c9bf0bbce5a3b23f4106f79728039b726d292bb93bc106787cb"
+dependencies = [
+ "idna",
+ "matches",
+ "percent-encoding",
+]
+
+[[package]]
+name = "vcpkg"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6454029bf181f092ad1b853286f23e2c507d8e8194d01d92da4a55c274a5508c"
+
+[[package]]
 name = "version_check"
 version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
index eef7b03..8fb2e65 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,6 +4,7 @@ version = "0.0.1"
 edition = "2018"
 
 [dependencies]
+git2 = "0.13.8"
 github-rs = "0.7.0"
 regex = "1.3.9"
 serde = { version = "1.0.114", features = ["derive"] }
diff --git a/src/lib.rs b/src/lib.rs
index f65b637..fe945be 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -204,4 +204,26 @@ mod tests {
     fn patches_file() {
         // File::open("../testdata/");
     }
+
+    #[test]
+    fn read_git_blob() {
+        use std::path::Path;
+
+        use git2::Repository;
+
+        let repo = Repository::open("./private/suggestion-test").unwrap();
+        let commit = repo.find_commit("b58be52880a0a0c0d397052351be31f19acdeca4".parse().unwrap()).unwrap();
+
+        let object = commit
+            .tree().unwrap()
+            .get_path(Path::new("src/server.rs")).unwrap()
+            .to_object(&repo).unwrap();
+
+        let blob = object
+            .as_blob().unwrap()
+            .content();
+
+        println!("{:?}", commit);
+        println!("{}", std::str::from_utf8(blob).unwrap());
+    }
 }