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//! An example using the Builder pattern API to configure the logger based on conditional
//! compilation.
//!
//! The default output is `module::path: message`, and the "tag", which is the text to the left of
//! the colon, is colorized. This example shows how to change the output based on a conditional
//! compilation, such as a Debug versus Release build. In a Debug build, the default output is
//! used with a maximum level of TRACE. In a Release build, the module path is replaced with the
//! level and the maximum level is limited to INFO.
//!
//! The [clap](https://crates.io/crates/clap) argument parser is used in this example, but loggerv
//! works with any argument parser.
extern crate ansi_term;
#[macro_use] extern crate log;
extern crate loggerv;
fn main() {
// Add the following line near the beginning of the main function for an application to enable
// colorized output on Windows 10.
//
// Based on documentation for the ansi_term crate, Windows 10 supports ANSI escape characters,
// but it must be enabled first using the `ansi_term::enable_ansi_support()` function. It is
// conditionally compiled and only exists for Windows builds. To avoid build errors on
// non-windows platforms, a cfg guard should be put in place.
#[cfg(windows)] ansi_term::enable_ansi_support().unwrap();
// This is the correct way to determine the build profile using the `cfg` macro according to
// this [discussion](https://users.rust-lang.org/t/conditional-compilation-for-debug-release/1098)
// and the [documentation](http://doc.crates.io/manifest.html#the-profile-sections) for the
// Cargo manifest.
if cfg!(debug_assertions) {
loggerv::Logger::new()
.max_level(log::Level::Trace)
} else {
loggerv::Logger::new()
.no_module_path()
.level(true)
.max_level(log::Level::Info)
}.init().unwrap();
error!("This is printed to stderr with a Debug or Release build");
warn!("This is printed to stderr with a Debug or Release build");
info!("This is printed to stdout with a Debug or Release build");
debug!("This is only printed to stdout with a Debug build");
trace!("This is not printed to stdout with a Debug build");
}
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