Static pubkey example.

examples/tutorial/basic-0/programs/basic-0/Cargo.toml

@@ -14,3 +14,4 @@ cpi = ["no-entrypoint"]
 
 [dependencies]
 anchor-lang = { path = "../../../../../lang" }
+pubkey = { path = "./src/pubkey" }

examples/tutorial/basic-0/programs/basic-0/src/lib.rs

@@ -1,11 +1,14 @@
 use anchor_lang::prelude::*;
+use pubkey;
 
 declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
 
 #[program]
 mod basic_0 {
+
     use super::*;
     pub fn initialize(_ctx: Context<Initialize>) -> ProgramResult {
+        let hmm = pubkey::pubkey!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
         Ok(())
     }
 }

examples/tutorial/basic-0/programs/basic-0/src/pubkey/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "pubkey"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+proc-macro = true
+
+[dependencies]
+proc-macro2 = "1.0"
+quote = "1.0"
+syn = { version = "1.0.60", features = ["full"] }
+anchor-syn = { path = "../../../../../../../lang/syn", version = "0.16.1", features = [
+    "hash",
+] }
+bs58 = "0.4.0"

examples/tutorial/basic-0/programs/basic-0/src/pubkey/src/lib.rs

@@ -0,0 +1,28 @@
+use proc_macro2::Span;
+use quote::quote;
+use syn::{parse_macro_input, LitByte, LitStr};
+
+#[proc_macro]
+pub fn pubkey(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    use std::convert::TryFrom;
+    let id_literal = parse_macro_input!(input as LitStr);
+    let id_vec = bs58::decode(id_literal.value())
+        .into_vec()
+        .map_err(|_| syn::Error::new_spanned(&id_literal, "failed to decode base58 string"))
+        .unwrap();
+    let id_array = <[u8; 32]>::try_from(<&[u8]>::clone(&&id_vec[..]))
+        .map_err(|_| {
+            syn::Error::new_spanned(
+                &id_literal,
+                format!("pubkey array is not 32 bytes long: len={}", id_vec.len()),
+            )
+        })
+        .unwrap();
+    let bytes = id_array.iter().map(|b| LitByte::new(*b, Span::call_site()));
+    let output = quote! {
+        ::anchor_lang::solana_program::pubkey::Pubkey::new_from_array(
+            [#(#bytes,)*]
+        )
+    };
+    output.into()
+}

lang/attribute/account/src/lib.rs

@@ -1,7 +1,8 @@
 extern crate proc_macro;
 
+use proc_macro2::Span;
 use quote::quote;
-use syn::parse_macro_input;
+use syn::{parse_macro_input, LitByte, LitStr};
 
 mod id;