*: add Makefile and adjust test folder (#14)

Cargo.toml

@@ -11,7 +11,7 @@ exclude = [
   ".gitignore",
   ".travis.yml",
   "deploy.sh",
-  "test/**/*",
+  "tests/**/*",
 ]
 
 [features]
@@ -23,7 +23,7 @@ portable = ["librocksdb_sys/portable"]
 [[test]]
 
 name = "test"
-path = "test/test.rs"
+path = "tests/test.rs"
 
 [dependencies]
 libc = "0.2.11"

Makefile

+.PHONY: all format
+
+# format rust code using the specified command for the specified file or directory.
+# $(call do-format-with-cmd,cmd,file-or-dir)
+define do-format-with-cmd
+	$1 --write-mode diff $2 |  grep -E "Diff .*at line" > /dev/null && $1 --write-mode overwrite $2 || exit 0
+endef
+
+# format rust code in the specified file or directory
+# a file of rust code follows the convention of having suffix '.rs'
+# $(call format-code-in,file-or-dir)
+define format-code-in
+	$(if $(filter %.rs, $1),  \
+    $(call do-format-with-cmd, rustfmt, $1), \
+    cd $1 && $(call do-format-with-cmd, cargo fmt --))
+endef
+
+all: format build test
+
+build:
+	@cargo build 
+
+test:
+	@export RUST_BACKTRACE=1 && cargo test -- --nocapture 
+
+format: 
+	@$(call format-code-in, .)
+	@$(call format-code-in, tests/test.rs)
+	@$(call format-code-in, librocksdb_sys)
+
+clean:
+	@cargo clean
+	@cd librocksdb_sys && cargo clean 
\ No newline at end of file

librocksdb_sys/src/lib.rs

@@ -490,7 +490,8 @@ extern "C" {
                                                                  klen: size_t));
     pub fn crocksdb_writebatch_data(batch: *mut DBWriteBatch, size: *mut size_t) -> *const u8;
     pub fn crocksdb_writebatch_set_save_point(batch: *mut DBWriteBatch);
-    pub fn crocksdb_writebatch_rollback_to_save_point(batch: *mut DBWriteBatch, err: *mut *mut c_char);
+    pub fn crocksdb_writebatch_rollback_to_save_point(batch: *mut DBWriteBatch,
+                                                      err: *mut *mut c_char);
 
     // Comparator
     pub fn crocksdb_options_set_comparator(options: *mut DBOptions, cb: *mut DBComparator);