Chapter 0103 done

Projects/hello_cargo/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "hello_cargo"
+version = "0.1.0"
+edition = "2021"
+authors = ["HaQadosch Berraka <haqadosch+rust@pm.me>"]
+description = "displays hello world"
+documentation = "./docs/ref.org"
+readme = "./docs/readme.org"
+
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

Projects/hello_cargo/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

README.org

@@ -1,3 +1,6 @@
+:PROPERTIES:
+:header-args:shell: :results output
+:END:
 #+title: RustBook
 #+author: HaQadosch Berraka
 #+date: [2024-02-09 Fri]
@@ -8,7 +11,7 @@
 * Getting Started
 
 ** Chapter 01: Installation
-Recommendation is to use ~rustup~ using the command:
+Recommendation is to use *rustup* using the command:
 #+name: install rustup
 #+begin_src shell
   curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh
@@ -23,18 +26,16 @@ To confirm it's installed:
 #+RESULTS: confirm rustup installed
 : rustup 1.26.0 (5af9b9484 2023-04-05)
 *** Update
-To update ~rustup~ and please do regularly
+To update *rustup* and please do regularly
 #+name: update rustup
 #+begin_src shell :results output
   rustup update
 #+end_src
 
 #+RESULTS: update rustup
-: 
 : stable-x86_64-unknown-linux-gnu unchanged - rustc 1.76.0 (07dca489a 2024-02-04)
-: 
 *** Documentation
-~rustup~ comes with documentation, just type
+*rustup* comes with documentation, just type
 #+begin_src shell
   rustup doc
 #+end_src
@@ -67,10 +68,118 @@ To execute this program:
 #+RESULTS: 0102 call main
 : Hello, World!
 
-The program wordes, I'm now done.
+The program works, I'm now done.
 
 *** Note
 All rust program starts by calling the function ~main~.
 Functions with ~!~ appended to their name, like ~println!~, are macros.
 
+** Chapter 03: Hello, Cargo!
+:PROPERTIES:
+:header-args:shell: :dir ./Projects/hello_cargo :results output
+:END:
 
+Make sure *Cargo* is installed
+#+name: cargo version
+#+begin_src shell
+  cargo --version
+#+end_src
+
+#+RESULTS: cargo version
+: cargo 1.76.0 (c84b36747 2024-01-18)
+
+*** New project with *Cargo*
+#+name: new cargo
+#+begin_src shell
+  cargo new Projects/hello_cargo
+  tree Projects/hello_cargo
+#+end_src
+
+#+RESULTS: new cargo
+: Projects/hello_cargo
+: ├── Cargo.toml
+: └── src
+:     └── main.rs
+: 
+: 2 directories, 2 files
+
+*Cargo* creates:
+- a directory with the project name given,
+- and a project with the same name
+
+The *Cargo* configuration file =Cargo.toml= in the root folder and
+the projcet code in the =src/= directiory is what makes it a *Rust* project.
+
+*** Building with Cargo
+From the root folder, run
+#+name: buiild cargo
+#+begin_src shell
+  cargo build
+#+end_src
+
+#+RESULTS: buiild cargo
+
+This will create a =Cargo.lock= file in the root directory, and
+an executable in =src/target/debug/hello_cargo=.
+Which means you can display the text "hello, World!" by calling directly the file
+#+name: direct call
+#+begin_src shell
+  ./target/debug/hello_cargo
+#+end_src
+
+#+RESULTS: direct call
+: Hello, world!
+
+*** Running a cargo
+You can both build and run the program with
+#+name: run hello_cargo
+#+begin_src shell
+  cargo run
+#+end_src
+
+#+RESULTS: run hello_cargo
+: Hello, world!
+
+*** Checking a cargo
+*Cargo* can check if the program can compile. It doesn't execute it.
+#+name: check hello_cargo
+#+begin_src shell
+  cargo check
+#+end_src
+
+#+RESULTS: check hello_cargo
+:     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
+: [ Babel evaluation exited with code 0 ]
+
+*** Releasing a cargo
+To build a cargo with an optimised build, run
+
+#+name: release hello_cargo
+#+begin_src shell
+  cargo build --release
+  tree
+#+end_src
+
+#+RESULTS: release hello_cargo
+#+begin_example
+.
+├── Cargo.lock
+├── Cargo.toml
+├── src
+│   └── main.rs
+└── target
+    ├── CACHEDIR.TAG
+    └── release
+        ├── build
+        ├── deps
+        │   ├── hello_cargo-ac6d8d77e18d4d6b
+        │   └── hello_cargo-ac6d8d77e18d4d6b.d
+        ├── examples
+        ├── hello_cargo
+        ├── hello_cargo.d
+        └── incremental
+
+8 directories, 8 files
+#+end_example
+
+The build results are in the folder =target/release/= now.