pleshevskiy/itconfig
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feat: add namespace to macro

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Dmitriy Pleshevskiy 2019-12-25 10:04:20 +03:00
parent 6abe819b35
commit a5912eb99b
3 changed files with 150 additions and 22 deletions
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2
itconfig/Cargo.toml
View file

@ -1,6 +1,6 @@
[package]
name = "itconfig"
version = "0.2.3"
version = "0.3.0"
authors = ["Dmitriy Pleshevskiy <dmitriy@ideascup.me>"]
description = "Easy build a configs from environment variables and use it in globally."
categories = ["config", "web-programming"]

150
itconfig/src/lib.rs
View file

@ -23,9 +23,7 @@
#[doc(hidden)]
macro_rules! __impl_from_for_numbers {
(
$($ty:ty),+
) => {
($($ty:ty),+) => {
$(
impl From<EnvValue> for $ty {
fn from(env: EnvValue) -> Self {
@ -39,13 +37,7 @@ macro_rules! __impl_from_for_numbers {
#[derive(Debug)]
#[doc(hidden)]
struct EnvValue(String);
impl EnvValue {
pub fn new(string: String) -> Self {
Self(string)
}
}
pub struct EnvValue(String);
__impl_from_for_numbers![
i8, i16, i32, i64, i128, isize,
@ -85,21 +77,25 @@ impl From<EnvValue> for String {
///
/// ```rust
/// # #[macro_use] extern crate itconfig;
/// # use std::env;
/// # env::set_var("DATABASE_URL", "postgres://u:p@localhost:5432/db");
/// config! {
/// DATABASE_URL: String,
/// }
/// # fn main () {}
/// # cfg::init()
/// ```
///
/// Config with default value
///
/// ```rust
/// # #[macro_use] extern crate itconfig;
/// # use std::env;
/// # env::set_var("DATABASE_URL", "postgres://u:p@localhost:5432/db");
/// config! {
/// DATABASE_URL: String,
/// HOST: String => "127.0.0.1".to_string(),
/// }
/// # fn main () {}
/// # cfg::init()
/// ```
///
/// By default itconfig lib creates module with 'cfg' name. But you can use simple meta instruction
@ -107,12 +103,38 @@ impl From<EnvValue> for String {
///
/// ```rust
/// # #[macro_use] extern crate itconfig;
/// # use std::env;
/// env::set_var("DEBUG", "t");
///
/// config! {
/// #![mod_name = configuration]
///
/// DEBUG: bool,
/// }
/// # fn main () {}
///
/// configuration::init();
/// assert_eq!(configuration::DEBUG(), true);
/// ```
///
/// You can use namespaces for env variables
///
/// ```rust
/// # #[macro_use] extern crate itconfig;
/// # use std::env;
/// env::set_var("DEBUG", "t");
/// env::set_var("DATABASE_USERNAME", "user");
/// env::set_var("DATABASE_PASSWORD", "pass");
/// env::set_var("DATABASE_HOST", "localhost");
///
/// config! {
/// DEBUG: bool,
/// DATABASE {
/// USERNAME: String,
/// PASSWORD: String,
/// HOST: String,
/// }
/// }
/// # cfg::init()
/// ```
///
///
@ -185,6 +207,7 @@ macro_rules! __itconfig_parse_module {
__itconfig_parse_variables! {
tokens = $tokens,
variables = [],
namespaces = [],
module = {
name = $name,
},
@ -201,6 +224,27 @@ macro_rules! __itconfig_parse_module {
#[macro_export]
#[doc(hidden)]
macro_rules! __itconfig_parse_variables {
// Find namespace
(
tokens = [
$ns_name:ident { $($ns_tokens:tt)* }
$($rest:tt)*
],
$($args:tt)*
) => {
__itconfig_parse_variables! {
tokens = [$($ns_tokens)*],
variables = [],
callback = {
current_namespace = {
name = $ns_name,
},
tokens = [$($rest)*],
$($args)*
},
}
};
// Find variable with default value
(
tokens = [
@ -256,6 +300,34 @@ macro_rules! __itconfig_parse_variables {
}
};
// Done parsing all variables of namespace
(
tokens = [],
variables = $ns_variables:tt,
callback = {
current_namespace = {
$($current_namespace:tt)*
},
tokens = $tokens:tt,
variables = $variables:tt,
namespaces = [$($namespaces:tt,)*],
$($args:tt)*
},
) => {
__itconfig_parse_variables! {
tokens = $tokens,
variables = $variables,
namespaces = [
$($namespaces,)*
{
variables = $ns_variables,
$($current_namespace)*
},
],
$($args)*
}
};
// Done parsing all variables
(
tokens = [],
@ -276,9 +348,16 @@ macro_rules! __itconfig_parse_variables {
macro_rules! __itconfig_impl {
(
variables = [$({
name = $name:ident,
name = $var_name:ident,
$($variable:tt)*
},)+],
},)*],
namespaces = [$({
variables = [$({
name = $ns_var_name:tt,
$($ns_variables:tt)*
},)*],
name = $ns_name:ident,
},)*],
module = {
name = $mod_name:ident,
},
@ -288,16 +367,37 @@ macro_rules! __itconfig_impl {
use std::env;
use $crate::EnvValue;
$(
pub mod $ns_name {
use std::env;
use $crate::EnvValue;
$(__itconfig_variable! {
name = $ns_var_name,
$($ns_variables)*
env_prefix = concat!(stringify!($ns_name), "_"),
})*
}
)*
pub fn init() {
$($name();)+
$($var_name();)*
$($($ns_name::$ns_var_name();)*)*
}
$(__itconfig_variable! {
name = $name,
name = $var_name,
$($variable)*
})+
env_prefix = "",
})*
}
};
// Invalid syntax
($($tokens:tt)*) => {
__itconfig_invalid_syntax!();
};
}
@ -310,9 +410,10 @@ macro_rules! __itconfig_variable {
ty = $ty:ty,
env_name = $env_name:expr,
default = $default:expr,
env_prefix = $env_prefix:expr,
) => {
pub fn $name() -> $ty {
env::var($env_name)
env::var(concat!($env_prefix, $env_name))
.map(|val| EnvValue::from(val).into())
.unwrap_or_else(|_| $default)
}
@ -323,15 +424,22 @@ macro_rules! __itconfig_variable {
name = $name:ident,
ty = $ty:ty,
env_name = $env_name:expr,
env_prefix = $env_prefix:expr,
) => {
pub fn $name() -> $ty {
env::var($env_name)
env::var(concat!($env_prefix, $env_name))
.map(|val| EnvValue::from(val).into())
.unwrap_or_else(|_| {
panic!(format!(r#"Cannot read "{}" environment variable"#, $env_name))
panic!(format!(r#"Cannot read "{}" environment variable"#,
concat!($env_prefix, $env_name)))
})
}
};
// Invalid syntax
($($tokens:tt)*) => {
__itconfig_invalid_syntax!();
};
}

20
itconfig_tests/tests/config_macro.rs
View file

@ -1,4 +1,7 @@
#![feature(trace_macros)]
use std::env;
#[macro_use]
extern crate itconfig;
@ -120,4 +123,21 @@ fn change_config_module_name() {
}
assert_eq!(custom_config_name::DEBUG(), true);
}
#[test]
fn config_namespace() {
config! {
DEBUG: bool => true,
POSTGRES {
HOST: bool => true,
PORT: bool => true,
USERNAME: bool => true,
}
}
assert_eq!(cfg::DEBUG(), true);
assert_eq!(cfg::POSTGRES::HOST(), true);
}