├── .github └── dependabot.yml ├── .gitignore ├── Cargo.toml ├── LICENSE-APACHE ├── LICENSE-MIT ├── README.md ├── img └── log_messages_styled.png └── src ├── lib.rs └── style.rs /.github/dependabot.yml: -------------------------------------------------------------------------------- 1 | version: 2 2 | updates: 3 | - package-ecosystem: cargo 4 | directory: "/" 5 | schedule: 6 | interval: daily 7 | open-pull-requests-limit: 10 8 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Created by https://www.gitignore.io/api/vim,rust 2 | # Edit at https://www.gitignore.io/?templates=vim,rust 3 | 4 | ### Rust ### 5 | # Generated by Cargo 6 | # will have compiled files and executables 7 | /target/ 8 | 9 | # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries 10 | # More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html 11 | Cargo.lock 12 | 13 | # These are backup files generated by rustfmt 14 | **/*.rs.bk 15 | 16 | ### Vim ### 17 | # Swap 18 | [._]*.s[a-v][a-z] 19 | [._]*.sw[a-p] 20 | [._]s[a-rt-v][a-z] 21 | [._]ss[a-gi-z] 22 | [._]sw[a-p] 23 | 24 | # Session 25 | Session.vim 26 | 27 | # Temporary 28 | .netrwhist 29 | *~ 30 | # Auto-generated tag files 31 | tags 32 | # Persistent undo 33 | [._]*.un~ 34 | 35 | # End of https://www.gitignore.io/api/vim,rust 36 | -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "console_log" 3 | version = "1.0.0" 4 | authors = ["Matthew Nicholson "] 5 | edition = "2018" 6 | keywords = ["log", "logging", "console", "web_sys", "wasm"] 7 | description = "A logging facility that routes Rust log messages to the browser's console." 8 | license = "MIT/Apache-2.0" 9 | readme = "README.md" 10 | categories = ["wasm"] 11 | repository = "https://github.com/iamcodemaker/console_log" 12 | documentation = "https://docs.rs/console_log" 13 | 14 | [dependencies.log] 15 | version = "0.4" 16 | 17 | [dependencies.web-sys] 18 | version = "0.3" 19 | features = ["console"] 20 | 21 | [dependencies.wasm-bindgen] 22 | version = "0.2" 23 | optional = true 24 | 25 | [features] 26 | default = [] 27 | color = ["wasm-bindgen"] 28 | -------------------------------------------------------------------------------- /LICENSE-APACHE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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IN NO EVENT SHALL THE 16 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 19 | SOFTWARE. 20 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # console_log [![Crates.io](https://img.shields.io/crates/v/console_log.svg)](https://crates.io/crates/console_log) 2 | 3 | A logger that routes messages to the browser's console. 4 | 5 | ## Usage 6 | 7 | ```rust 8 | use log::Level; 9 | fn main() { 10 | console_log::init_with_level(Level::Debug); 11 | 12 | info!("It works!"); 13 | 14 | // ... 15 | } 16 | ``` 17 | 18 | ## Details 19 | 20 | Rust's log levels map to the browser's console log in the following way. 21 | 22 | | Rust | Web Console | 23 | |------------|-------------------| 24 | | `trace!()` | `console.debug()` | 25 | | `debug!()` | `console.log()` | 26 | | `info!()` | `console.info()` | 27 | | `warn!()` | `console.warn()` | 28 | | `error!()` | `console.error()` | 29 | 30 | ## Colors 31 | 32 | The `"color"` feature adds styling to the log messages. 33 | 34 | `Cargo.toml` 35 | ```toml 36 | console_log = { version = "1", features = ["color"] } 37 | ``` 38 | 39 | The styled log messages will be rendered as follows: 40 | 41 | ![Styled log messages](img/log_messages_styled.png) 42 | 43 | ## Code Size 44 | 45 | [Twiggy](https://github.com/rustwasm/twiggy) reports this library adding about 46 | 180Kb to the size of a minimal wasm binary in a debug build. If you want to 47 | avoid this, mark the library as optional and conditionally initialize it in 48 | your code for non-release builds. 49 | 50 | `Cargo.toml` 51 | ```toml 52 | [dependencies] 53 | cfg-if = "0.1" 54 | log = "0.4" 55 | console_log = { version = "1", optional = true } 56 | 57 | [features] 58 | default = ["console_log"] 59 | ``` 60 | 61 | `lib.rs` 62 | ```rust 63 | use wasm_bindgen::prelude::*; 64 | use cfg_if::cfg_if; 65 | 66 | cfg_if! { 67 | if #[cfg(feature = "console_log")] { 68 | fn init_log() { 69 | use log::Level; 70 | console_log::init_with_level(Level::Trace).expect("error initializing log"); 71 | } 72 | } else { 73 | fn init_log() {} 74 | } 75 | } 76 | 77 | #[wasm_bindgen] 78 | pub fn main() { 79 | init_log(); 80 | // ... 81 | } 82 | ``` 83 | 84 | ## Limitations 85 | 86 | The file and line number information associated with the log messages reports 87 | locations from the shims generated by `wasm-bindgen`, not the location of the 88 | logger call. 89 | 90 | ## License 91 | 92 | This project is licensed under either of 93 | 94 | * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or 95 | http://www.apache.org/licenses/LICENSE-2.0) 96 | * MIT license ([LICENSE-MIT](LICENSE-MIT) or 97 | http://opensource.org/licenses/MIT) 98 | 99 | at your option. 100 | 101 | ## Contributing 102 | 103 | Unless you explicitly state otherwise, any contribution intentionally submitted 104 | for inclusion in this project by you, as defined in the Apache-2.0 license, 105 | shall be dual licensed as above, without any additional terms or conditions. 106 | 107 | ## See Also 108 | 109 | - [`wasm-logger`](https://gitlab.com/limira-rs/wasm-logger) 110 | - [`wasm-bindgen-console-logger`](https://github.com/blm768/wasm-bindgen-console-logger) 111 | - [`fern`](https://github.com/daboross/fern) (use with `console_log::log`) 112 | -------------------------------------------------------------------------------- /img/log_messages_styled.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/iamcodemaker/console_log/1ad307b4ca079fadeab3690a9493c542ae67465f/img/log_messages_styled.png -------------------------------------------------------------------------------- /src/lib.rs: -------------------------------------------------------------------------------- 1 | #![deny(missing_docs)] 2 | #![doc(html_root_url = "https://docs.rs/console_log/1.0.0")] 3 | 4 | //! A logger that logs to the browser's console. 5 | //! 6 | //! # Example 7 | //! 8 | //! ```rust,no_run 9 | //! use log::Level; 10 | //! use log::info; 11 | //! fn main() { 12 | //! console_log::init_with_level(Level::Debug); 13 | //! 14 | //! info!("It works!"); 15 | //! 16 | //! // ... 17 | //! } 18 | //! ``` 19 | //! 20 | //! # Log Levels 21 | //! 22 | //! Rust's log levels map to the browser's console log in the following way. 23 | //! 24 | //! | Rust | Web Console | 25 | //! |------------|-------------------| 26 | //! | `trace!()` | `console.debug()` | 27 | //! | `debug!()` | `console.log()` | 28 | //! | `info!()` | `console.info()` | 29 | //! | `warn!()` | `console.warn()` | 30 | //! | `error!()` | `console.error()` | 31 | //! 32 | //! # Getting Fancy 33 | //! 34 | //! The feature set provided by this crate is intentionally very basic. If you need more flexible 35 | //! formatting of log messages (timestamps, file and line info, etc.) this crate can be used with 36 | //! the [`fern`] logger via the [`console_log::log`] function. 37 | //! 38 | //! ## Colors 39 | //! 40 | //! The `"color"` feature adds styling to the log messages. 41 | //! 42 | //! `Cargo.toml` 43 | //! ```toml 44 | //! console_log = { version = "1", features = ["color"] } 45 | //! ``` 46 | //! 47 | //! The styled log messages will be rendered as follows: 48 | //! 49 | //! ![Styled log messages](img/log_messages_styled.png) 50 | //! 51 | //! # Code Size 52 | //! 53 | //! [Twiggy] reports this library adding about 180Kb to the size of a minimal wasm binary in a 54 | //! debug build. If you want to avoid this, mark the library as optional and conditionally 55 | //! initialize it in your code for non-release builds. 56 | //! 57 | //! `Cargo.toml` 58 | //! ```toml 59 | //! [dependencies] 60 | //! cfg-if = "0.1" 61 | //! log = "0.4" 62 | //! console_log = { version = "1", optional = true } 63 | //! 64 | //! [features] 65 | //! default = ["console_log"] 66 | //! ``` 67 | //! 68 | //! `lib.rs` 69 | //! ```rust,ignore 70 | //! use wasm_bindgen::prelude::*; 71 | //! use cfg_if::cfg_if; 72 | //! 73 | //! cfg_if! { 74 | //! if #[cfg(feature = "console_log")] { 75 | //! fn init_log() { 76 | //! use log::Level; 77 | //! console_log::init_with_level(Level::Trace).expect("error initializing log"); 78 | //! } 79 | //! } else { 80 | //! fn init_log() {} 81 | //! } 82 | //! } 83 | //! 84 | //! #[wasm_bindgen] 85 | //! pub fn main() { 86 | //! init_log(); 87 | //! // ... 88 | //! } 89 | //! ``` 90 | //! 91 | //! # Limitations 92 | //! 93 | //! The file and line number information associated with the log messages reports locations from 94 | //! the shims generated by `wasm-bindgen`, not the location of the logger call. 95 | //! 96 | //! [Twiggy]: https://github.com/rustwasm/twiggy 97 | //! [`console_log::log`]: fn.log.html 98 | //! [`fern`]: https://docs.rs/fern 99 | 100 | use log::{Level, Log, Metadata, Record, SetLoggerError}; 101 | use web_sys::console; 102 | 103 | #[cfg(feature = "color")] 104 | use wasm_bindgen::JsValue; 105 | 106 | #[cfg(feature = "color")] 107 | const STYLE: style::Style<'static> = style::Style::default(); 108 | 109 | #[cfg(feature = "color")] 110 | #[doc(hidden)] 111 | mod style; 112 | 113 | static LOGGER: WebConsoleLogger = WebConsoleLogger {}; 114 | 115 | struct WebConsoleLogger {} 116 | 117 | impl Log for WebConsoleLogger { 118 | #[inline] 119 | fn enabled(&self, metadata: &Metadata) -> bool { 120 | metadata.level() <= log::max_level() 121 | } 122 | 123 | fn log(&self, record: &Record) { 124 | if !self.enabled(record.metadata()) { 125 | return; 126 | } 127 | 128 | log(record); 129 | } 130 | 131 | fn flush(&self) {} 132 | } 133 | 134 | /// Print a `log::Record` to the browser's console at the appropriate level. 135 | /// 136 | /// This function is useful for integrating with the [`fern`](https://crates.io/crates/fern) logger 137 | /// crate. 138 | /// 139 | /// ## Example 140 | /// ```rust,ignore 141 | /// fern::Dispatch::new() 142 | /// .chain(fern::Output::call(console_log::log)) 143 | /// .apply()?; 144 | /// ``` 145 | #[cfg_attr(not(feature = "color"), inline)] 146 | pub fn log(record: &Record) { 147 | #[cfg(not(feature = "color"))] 148 | { 149 | // pick the console.log() variant for the appropriate logging level 150 | let console_log = match record.level() { 151 | Level::Error => console::error_1, 152 | Level::Warn => console::warn_1, 153 | Level::Info => console::info_1, 154 | Level::Debug => console::log_1, 155 | Level::Trace => console::debug_1, 156 | }; 157 | 158 | console_log(&format!("{}", record.args()).into()); 159 | } 160 | 161 | #[cfg(feature = "color")] 162 | { 163 | // pick the console.log() variant for the appropriate logging level 164 | let console_log = match record.level() { 165 | Level::Error => console::error_4, 166 | Level::Warn => console::warn_4, 167 | Level::Info => console::info_4, 168 | Level::Debug => console::log_4, 169 | Level::Trace => console::debug_4, 170 | }; 171 | 172 | let message = { 173 | let message = format!( 174 | "%c{level}%c {file}:{line} %c\n{text}", 175 | level = record.level(), 176 | file = record.file().unwrap_or_else(|| record.target()), 177 | line = record 178 | .line() 179 | .map_or_else(|| "[Unknown]".to_string(), |line| line.to_string()), 180 | text = record.args(), 181 | ); 182 | JsValue::from(&message) 183 | }; 184 | 185 | let level_style = { 186 | let style_str = match record.level() { 187 | Level::Trace => STYLE.trace, 188 | Level::Debug => STYLE.debug, 189 | Level::Info => STYLE.info, 190 | Level::Warn => STYLE.warn, 191 | Level::Error => STYLE.error, 192 | }; 193 | 194 | JsValue::from(style_str) 195 | }; 196 | 197 | let file_line_style = JsValue::from_str(STYLE.file_line); 198 | let text_style = JsValue::from_str(STYLE.text); 199 | console_log(&message, &level_style, &file_line_style, &text_style); 200 | } 201 | } 202 | 203 | /// Initializes the global logger setting `max_log_level` to the given value. 204 | /// 205 | /// ## Example 206 | /// 207 | /// ``` 208 | /// use log::Level; 209 | /// fn main() { 210 | /// console_log::init_with_level(Level::Debug).expect("error initializing logger"); 211 | /// } 212 | /// ``` 213 | #[inline] 214 | pub fn init_with_level(level: Level) -> Result<(), SetLoggerError> { 215 | log::set_logger(&LOGGER)?; 216 | log::set_max_level(level.to_level_filter()); 217 | Ok(()) 218 | } 219 | 220 | /// Initializes the global logger with `max_log_level` set to `Level::Info` (a sensible default). 221 | /// 222 | /// ## Example 223 | /// 224 | /// ``` 225 | /// fn main() { 226 | /// console_log::init().expect("error initializing logger"); 227 | /// } 228 | /// ``` 229 | #[inline] 230 | pub fn init() -> Result<(), SetLoggerError> { 231 | init_with_level(Level::Info) 232 | } 233 | -------------------------------------------------------------------------------- /src/style.rs: -------------------------------------------------------------------------------- 1 | /// Log message styling. 2 | /// 3 | /// Adapted from 4 | pub(crate) struct Style<'s> { 5 | pub trace: &'s str, 6 | pub debug: &'s str, 7 | pub info: &'s str, 8 | pub warn: &'s str, 9 | pub error: &'s str, 10 | pub file_line: &'s str, 11 | pub text: &'s str, 12 | } 13 | 14 | impl Style<'static> { 15 | /// Returns default style values. 16 | pub const fn default() -> Self { 17 | macro_rules! bg_color { 18 | ($color:expr) => { 19 | concat!("color: white; padding: 0 3px; background: ", $color, ";") 20 | }; 21 | }; 22 | 23 | Style { 24 | trace: bg_color!("gray"), 25 | debug: bg_color!("blue"), 26 | info: bg_color!("green"), 27 | warn: bg_color!("orange"), 28 | error: bg_color!("darkred"), 29 | file_line: "font-weight: bold; color: inherit", 30 | text: "background: inherit; color: inherit", 31 | } 32 | } 33 | } 34 | --------------------------------------------------------------------------------