Add fetch git last commit info example

Author: pymongo

examples/basic_execute_shell_command.rs

@@ -1,12 +1,19 @@
-use std::process::Command;
+#[derive(serde::Deserialize, Debug)]
+struct CommitInfo {
+    hash: String,
+    date: String,
+    message: String
+}
 
-fn main() {
-    let mut cmd = Command::new("df");
-    cmd.arg("-h");
-    match cmd.output() {
-        Ok(output) => unsafe {
-            println!("{}", String::from_utf8_unchecked(output.stdout));
-        },
-        Err(e) => println!("{}", e),
-    }
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let cmd_res = std::process::Command::new("git")
+        .arg("log")
+        .arg("-1")
+        .arg("--pretty=format:hash=\"%h\"\ndate=\"%ad\"\nmessage=\"%s\"")
+        .env("DATABASE_URL", "null")
+        .output()?;
+    let last_commit_str = String::from_utf8(cmd_res.stdout)?;
+    let last_commit: CommitInfo = toml::de::from_str(&last_commit_str)?;
+    dbg!(last_commit);
+    Ok(())
 }

examples/double_linked_list.rs

@@ -23,7 +23,7 @@ struct List<T> {
     tail: Node<T>,
 }
 
-// impl List<T> {
+// impl<T> List<T> {
 //     fn new(dummy_val: T) -> Self {
 //         let mut head = Node::new(dummy_val);
 //         let mut tail = Node::new(dummy_val);
@@ -37,5 +37,5 @@ struct List<T> {
 // }
 
 fn main() {
-    let mut head: Node<i32> = Node::new(-1);
+    let _head: Node<i32> = Node::new(-1);
 }

examples/gzip.rs

@@ -22,6 +22,4 @@ fn main() {
     let decode_str = decode_gzip_bytes_to_str(gzip_bytes);
     println!("{}", decode_str);
     assert_eq!(decode_str.as_str(), s);
-
-    use std::collections::BinaryHeap;
 }

examples/rust_decimal_lib_test.rs

@@ -1,7 +1,7 @@
 use bigdecimal::BigDecimal;
 use rust_decimal::Decimal;
 // use rust_decimal::prelude::FromStr;
-use rust_decimal::prelude::ToPrimitive;
+
 use std::mem::size_of_val;
 use std::str::FromStr;