feat(wpcarro/rust): Include std::fmt::Display example r/4396

Gotta know how to `to_string` things

Change-Id: I259ef61ecaf6ae7fabe0b3d211706ba5f429b3a7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6057
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

6 files changed, 123 insertions, 50 deletions

diff --git a/users/wpcarro/scratch/rust/Cargo.lock b/users/wpcarro/scratch/rust/Cargo.lock
new file mode 100644
index 0000000000..28aa1250ce
--- /dev/null
+++ b/users/wpcarro/scratch/rust/Cargo.lock
@@ -0,0 +1,89 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+
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+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rust"
+version = "0.1.0"
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+ "serde",
+ "serde_json",
+]
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+ "quote",
+ "syn",
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+ "itoa",
+ "ryu",
+ "serde",
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+ "unicode-ident",
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diff --git a/users/wpcarro/scratch/rust/json/Cargo.toml b/users/wpcarro/scratch/rust/Cargo.toml
index 76235d11d3..76235d11d3 100644
--- a/users/wpcarro/scratch/rust/json/Cargo.toml
+++ b/users/wpcarro/scratch/rust/Cargo.toml
diff --git a/users/wpcarro/scratch/rust/json/Cargo.lock b/users/wpcarro/scratch/rust/json/Cargo.lock
deleted file mode 100644
index a3b92976ec..0000000000
--- a/users/wpcarro/scratch/rust/json/Cargo.lock
+++ /dev/null
@@ -1,39 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
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-
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- "serde_json",
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-dependencies = [
- "itoa",
- "ryu",
- "serde",
-]
diff --git a/users/wpcarro/scratch/rust/src/display/mod.rs b/users/wpcarro/scratch/rust/src/display/mod.rs
new file mode 100644
index 0000000000..8384631091
--- /dev/null
+++ b/users/wpcarro/scratch/rust/src/display/mod.rs
@@ -0,0 +1,13 @@
+use std::fmt;
+
+pub struct Person {
+    pub fname: String,
+    pub lname: String,
+    pub age: i8,
+}
+
+impl fmt::Display for Person {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}, {} ({} years old)", self.lname, self.fname, self.age)
+    }
+}
diff --git a/users/wpcarro/scratch/rust/json/src/main.rs b/users/wpcarro/scratch/rust/src/json/mod.rs
index 6481224fff..d3307b394e 100644
--- a/users/wpcarro/scratch/rust/json/src/main.rs
+++ b/users/wpcarro/scratch/rust/src/json/mod.rs
@@ -37,7 +37,7 @@ struct Person {
 //    TL;DR:
 //    - read:  serde_json::from_str(data)
 //    - write: x.to_string()
-fn one() {
+pub fn one() {
     let data = json!({
         "fname": "William",
         "lname": "Carroll",
@@ -52,7 +52,7 @@ fn one() {
 //    TL;DR:
 //    - read:  serde_json::from_str(data)
 //    - write: x.to_string()
-fn two() {
+pub fn two() {
     let data = r#"{"fname":"William","lname":"Carroll","age":30}"#;
 
     let mut parsed: Value = serde_json::from_str(data).unwrap();
@@ -68,7 +68,7 @@ fn two() {
 //    TL;DR:
 //    - read:  serde_json::from_str(data)
 //    - write: serde_json::to_string(x).unwrap()
-fn three() {
+pub fn three() {
     let data = r#"{"fname":"William","lname":"Carroll","age":30}"#;
 
     let mut read: Person = serde_json::from_str(data).unwrap();
@@ -79,11 +79,3 @@ fn three() {
     let write = serde_json::to_string(&read).unwrap();
     println!("result: {:?}", write);
 }
-
-////////////////////////////////////////////////////////////////////////////////
-// Main
-////////////////////////////////////////////////////////////////////////////////
-
-fn main() {
-    three()
-}
diff --git a/users/wpcarro/scratch/rust/src/main.rs b/users/wpcarro/scratch/rust/src/main.rs
new file mode 100644
index 0000000000..da9e3d3c63
--- /dev/null
+++ b/users/wpcarro/scratch/rust/src/main.rs
@@ -0,0 +1,18 @@
+use serde::{Deserialize, Serialize};
+use serde_json::{json, Value};
+
+mod display;
+mod json;
+
+////////////////////////////////////////////////////////////////////////////////
+// Main
+////////////////////////////////////////////////////////////////////////////////
+
+fn main() {
+    let john: display::Person = display::Person {
+        fname: "John".to_string(),
+        lname: "Cleese".to_string(),
+        age: 82,
+    };
+    println!("Person: {}", john)
+}