Add basics/checking-accounts/steel

basics/checking-accounts/steel/Cargo.toml

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+[workspace]
+members = ["api", "program"]
+resolver = "2"
+
+[workspace.dependencies]
+solana-program = "1.18.17"
+steel = "2.0"
+bytemuck = "1.14"
+num_enum = "0.7"

basics/checking-accounts/steel/api/Cargo.toml

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+[package]
+name = "checking-accounts-steel-api"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+solana-program.workspace = true
+steel.workspace = true
+bytemuck.workspace = true
+num_enum.workspace = true
+
+[lib]
+crate-type = ["cdylib", "lib"]

basics/checking-accounts/steel/api/src/instruction.rs

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+use solana_program::msg;
+use steel::*;
+
+#[repr(u8)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq, TryFromPrimitive)]
+pub enum SteelInstruction {
+    CheckingAccounts = 0,
+}
+
+instruction!(SteelInstruction, CheckingAccounts);
+// CheckingAccounts instruction
+#[repr(C, packed)]
+#[derive(Clone, Copy, Debug, Pod, Zeroable)]
+pub struct CheckingAccounts {}
+
+impl CheckingAccounts {
+    pub fn process(accounts: &[AccountInfo]) -> ProgramResult {
+        // Accounts passed in a vector must be in the expected order.
+        // You can verify the list has the correct number of accounts.
+        // This error will get thrown by default if you
+        // reach pass the exact no of accounts specified.
+        let [payer, account_to_create, account_to_change, system_program] = accounts else {
+            msg!("This instruction requires 4 accounts:");
+            msg!("  payer, account_to_create, account_to_change, system_program");
+            return Err(ProgramError::NotEnoughAccountKeys);
+        };
+
+        // you can make sure an account is indeed a signer
+        if let Err(err) = payer.is_signer() {
+            msg!("The program expects payer to be a signer.");
+            return Err(err);
+        };
+
+        // You can make sure an account has NOT been initialized.
+        msg!("New account: {}", account_to_create.key);
+        if account_to_create.lamports() != 0 {
+            msg!("The program expected the account to create to not yet be initialized.");
+            return Err(ProgramError::AccountAlreadyInitialized);
+        };
+        // (Create account...)
+
+        // You can also make sure an account has been initialized.
+        msg!("Account to change: {}", account_to_change.key);
+        if account_to_change.lamports() == 0 {
+            msg!("The program expected the account to change to be initialized.");
+            return Err(ProgramError::UninitializedAccount);
+        };
+
+        // If we want to modify an account's data, it must be owned by our program.
+        account_to_change.has_owner(&crate::ID)?;
+
+        // You can also check pubkeys against constants.
+        system_program.has_address(&system_program::ID)?;
+
+        Ok(())
+    }
+}

basics/checking-accounts/steel/api/src/lib.rs

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+mod instruction;
+
+use steel::*;
+
+declare_id!("z7msBPQHDJjTvdQRoEcKyENgXDhSRYeHieN1ZMTqo35");
+
+pub mod prelude {
+    pub use crate::instruction::*;
+}

basics/checking-accounts/steel/cicd.sh

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+#!/bin/bash
+
+# This script is for quick building & deploying of the program.
+# It also serves as a reference for the commands used for building & deploying Solana programs.
+# Run this bad boy with "bash cicd.sh" or "./cicd.sh"
+
+cargo build-sbf --manifest-path=./program/Cargo.toml --bpf-out-dir=./program/target/so
+solana program deploy ./program/target/so/program.so

basics/checking-accounts/steel/package.json

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+{
+  "scripts": {
+    "test": "pnpm ts-mocha -p ./tsconfig.json -t 1000000 ./tests/test.ts",
+    "build-and-test": "cargo build-sbf --manifest-path=./program/Cargo.toml --sbf-out-dir=./tests/fixtures && pnpm test",
+    "build": "cargo build-sbf --manifest-path=./program/Cargo.toml --sbf-out-dir=./program/target/so",
+    "deploy": "solana program deploy ./program/target/so/program.so"
+  },
+  "dependencies": {
+    "@solana/web3.js": "^1.95.4"
+  },
+  "devDependencies": {
+    "@types/chai": "^4.3.1",
+    "@types/node": "^22.8.5",
+    "@types/mocha": "^10.0.9",
+    "chai": "^4.3.4",
+    "mocha": "^10.8.2",
+    "solana-bankrun": "^0.4.0",
+    "ts-mocha": "^10.0.0",
+    "typescript": "^5"
+  }
+}