pleshevskiy/itconfig
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feat: add custom meta for vars

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Dmitriy Pleshevskiy 2019-12-27 23:57:13 +03:00
parent 8510b534ce
commit b305b7334b
7 changed files with 97 additions and 10 deletions
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7
README.md
View file

@ -24,6 +24,10 @@ config! {
FOO: bool,
BAR: i32 => 10,
#[cfg(feature = "feature")]
#[env_name = "POSTGRES_CONNECTION_STRING"]
DATABASE_URL: String
}
}
@ -48,7 +52,8 @@ cargo test
* [x] Add namespace for variables
* [x] Custom env name
* [ ] Add if condition for feature variables
* [x] Support feature config and other meta directives
* [ ] Concat env variables to one variable
## License

7
itconfig/Cargo.toml
View file

@ -1,6 +1,6 @@
[package]
name = "itconfig"
version = "0.4.0"
version = "0.5.0"
authors = ["Dmitriy Pleshevskiy <dmitriy@ideascup.me>"]
description = "Easy build a configs from environment variables and use it in globally."
categories = ["config", "web-programming"]
@ -14,7 +14,8 @@ readme = "README.md"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[badges.travis-ci]
repository = "icetemple/itconfig-rs"
[badges]
travis-ci = { repository = "icetemple/itconfig-rs" }
maintenance = { status = "actively-developed" }
[dependencies]

7
itconfig/README.md
View file

@ -21,6 +21,10 @@ config! {
FOO: bool,
BAR: i32 => 10,
#[cfg(feature = "feature")]
#[env_name = "POSTGRES_CONNECTION_STRING"]
DATABASE_URL: String
}
}
@ -39,7 +43,8 @@ fn main () {
* [x] Add namespace for variables
* [x] Custom env name
* [ ] Add if condition for feature variables
* [x] Support feature config and other meta directives
* [ ] Concat env variables to one variable
## License

59
itconfig/src/lib.rs
View file

@ -172,6 +172,20 @@ impl From<EnvValue> for String {
/// assert_eq!(cfg::APP::RECIPES_PER_PAGE(), 95);
/// ```
///
/// Also you can add custom meta for each variable. For example feature configurations.
///
/// ```rust
/// # #[macro_use] extern crate itconfig;
/// config! {
/// #[cfg(feature = "postgres")]
/// DATABASE_URL: String,
///
/// #[cfg(not(feature = "postgres"))]
/// DATABASE_URL: String,
/// }
/// # fn main() {}
/// ```
///
///
/// This module will also contain helper method:
///
@ -296,6 +310,7 @@ macro_rules! __itconfig_parse_variables {
__itconfig_parse_variables! {
current_variable = {
unparsed_meta = [$(#$meta)*],
meta = [],
name = $name,
ty = $ty,
default = $default,
@ -317,6 +332,7 @@ macro_rules! __itconfig_parse_variables {
__itconfig_parse_variables! {
current_variable = {
unparsed_meta = [$(#$meta)*],
meta = [],
name = $name,
ty = $ty,
},
@ -325,12 +341,14 @@ macro_rules! __itconfig_parse_variables {
}
};
// Find meta with custom env name
(
current_variable = {
unparsed_meta = [
#[env_name = $env_name:expr]
$($meta:tt)*
$($rest:tt)*
],
meta = $meta:tt,
name = $name:ident,
$($current_variable:tt)*
},
@ -338,7 +356,8 @@ macro_rules! __itconfig_parse_variables {
) => {
__itconfig_parse_variables! {
current_variable = {
unparsed_meta = [$($meta)*],
unparsed_meta = [$($rest)*],
meta = $meta,
name = $name,
env_name = $env_name,
$($current_variable)*
@ -347,6 +366,30 @@ macro_rules! __itconfig_parse_variables {
}
};
// Find stranger meta
(
current_variable = {
unparsed_meta = [
#$stranger_meta:tt
$($rest:tt)*
],
meta = [$(#$meta:tt,)*],
name = $name:ident,
$($current_variable:tt)*
},
$($args:tt)*
) => {
__itconfig_parse_variables! {
current_variable = {
unparsed_meta = [$($rest)*],
meta = [$(#$meta,)* #$stranger_meta,],
name = $name,
$($current_variable)*
},
$($args)*
}
};
// Done parsing variable
(
current_variable = {
@ -412,12 +455,14 @@ macro_rules! __itconfig_parse_variables {
macro_rules! __itconfig_impl {
(
variables = [$({
meta = $var_meta:tt,
name = $var_name:ident,
$($variable:tt)*
},)*],
namespaces = [$({
variables = [$({
name = $ns_var_name:tt,
meta = $ns_var_meta:tt,
name = $ns_var_name:ident,
$($ns_variables:tt)*
},)*],
env_prefix = $ns_env_prefix:expr,
@ -439,6 +484,7 @@ macro_rules! __itconfig_impl {
use $crate::EnvValue;
$(__itconfig_variable! {
meta = $ns_var_meta,
name = $ns_var_name,
env_prefix = $ns_env_prefix,
$($ns_variables)*
@ -453,6 +499,7 @@ macro_rules! __itconfig_impl {
}
$(__itconfig_variable! {
meta = $var_meta,
name = $var_name,
env_prefix = $env_prefix,
$($variable)*
@ -471,12 +518,14 @@ macro_rules! __itconfig_impl {
#[doc(hidden)]
macro_rules! __itconfig_variable {
(
meta = $meta:tt,
name = $name:ident,
env_prefix = $env_prefix:expr,
ty = $ty:ty,
$($args:tt)*
) => {
__itconfig_variable! {
meta = $meta,
name = $name,
env_prefix = $env_prefix,
env_name = concat!($env_prefix, stringify!($name)).to_uppercase(),
@ -487,12 +536,14 @@ macro_rules! __itconfig_variable {
// Add method without default value
(
meta = $meta:tt,
name = $name:ident,
env_prefix = $env_prefix:expr,
env_name = $env_name:expr,
ty = $ty:ty,
) => {
__itconfig_variable! {
meta = $meta,
name = $name,
env_prefix = $env_prefix,
env_name = $env_name,
@ -503,12 +554,14 @@ macro_rules! __itconfig_variable {
// Add method with default value
(
meta = [$(#$meta:tt,)*],
name = $name:ident,
env_prefix = $env_prefix:expr,
env_name = $env_name:expr,
ty = $ty:ty,
default = $default:expr,
) => {
$(#$meta)*
pub fn $name() -> $ty {
env::var($env_name)
.map(|val| EnvValue::from(val).into())

23
itconfig_tests/tests/config_macro.rs
View file

@ -218,3 +218,26 @@ fn custom_environment_name_for_variable() {
assert_eq!(cfg::APP::RECIPES_PER_PAGE(), 95);
env::remove_var("MY_CUSTOM_NAME");
}
#[test]
fn stranger_meta_data() {
env::set_var("MY_CUSTOM_NAME", "95");
config! {
#[cfg(feature = "postgres")]
#[env_name = "MY_CUSTOM_NAME"]
DATABASE_URL: String,
#[cfg(not(feature = "postgres"))]
#[env_name = "MY_CUSTOM_NAME"]
DATABASE_URL: i32,
}
cfg::init();
#[cfg(not(feature = "postgres"))]
assert_eq!(cfg::DATABASE_URL(), 95);
#[cfg(feature = "postgres")]
assert_eq!(cfg::DATABASE_URL(), "95");
env::remove_var("MY_CUSTOM_NAME");
}