feat: add command line option for log file

Cargo.lock

@@ -1853,6 +1853,20 @@ dependencies = [
  "miniz_oxide",
 ]
 
+[[package]]
+name = "flexi_logger"
+version = "0.28.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cca927478b3747ba47f98af6ba0ac0daea4f12d12f55e9104071b3dc00276310"
+dependencies = [
+ "chrono",
+ "glob",
+ "log",
+ "nu-ansi-term",
+ "regex",
+ "thiserror",
+]
+
 [[package]]
 name = "flume"
 version = "0.11.0"
@@ -2051,6 +2065,12 @@ dependencies = [
  "xml-rs",
 ]
 
+[[package]]
+name = "glob"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2fabcfbdc87f4758337ca535fb41a6d701b65693ce38287d856d1674551ec9b"
+
 [[package]]
 name = "glow"
 version = "0.13.1"
@@ -2200,6 +2220,7 @@ dependencies = [
  "env_logger",
  "figment",
  "flate2",
+ "flexi_logger",
  "image 0.25.1",
  "is_elevated",
  "log",
@@ -3072,6 +3093,15 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "nu-ansi-term"
+version = "0.50.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd2800e1520bdc966782168a627aa5d1ad92e33b984bf7c7615d31280c83ff14"
+dependencies = [
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "num-bigint"
 version = "0.4.5"

Cargo.toml

@@ -76,6 +76,7 @@ chrono = {version="0.4.38", default-features=false, features=["clock", "std"]}
 enclose = "1.2.0"
 bounded-vec-deque = {version="0.1.1", default-features=false}
 cfg-if = "1.0"
+flexi_logger = "0.28"
 # Unix dependencies
 [target.'cfg(unix)'.dependencies]
 eframe = { version = "0.27.2", features = ["wgpu"] }

src/cli.rs

@@ -1,5 +1,3 @@
-use std::process::exit;
-
 use clap::crate_authors;
 use clap::crate_description;
 use clap::crate_name;
@@ -9,6 +7,7 @@ use clap::Subcommand;
 use log::debug;
 use log::info;
 use log::warn;
+use std::process::exit;
 
 use crate::app::App;
 use crate::miscs::print_disk_file;
@@ -29,6 +28,8 @@ use crate::resets::reset_state;
 pub struct Cli {
     #[command(subcommand)]
     pub info: Option<GupaxxData>,
+    #[clap(long, short, action)]
+    pub logfile: bool,
 }
 
 #[derive(Subcommand)]

src/inits.rs

@@ -16,6 +16,7 @@ use egui::TextStyle::{Body, Button, Heading, Monospace, Name};
 use egui::*;
 use env_logger::fmt::style::Style;
 use env_logger::{Builder, WriteStyle};
+use flexi_logger::{FileSpec, Logger};
 use log::LevelFilter;
 use std::sync::Arc;
 use std::time::Instant;
@@ -74,18 +75,25 @@ pub fn init_text_styles(ctx: &egui::Context, width: f32, pixels_per_point: f32)
 
 #[cold]
 #[inline(never)]
-pub fn init_logger(now: Instant) {
+pub fn init_logger(now: Instant, logfile: bool) {
-    let filter_env = std::env::var("RUST_LOG").unwrap_or_else(|_| "INFO".to_string());
+    if logfile {
-    let filter = match filter_env.as_str() {
+        Logger::try_with_env_or_str("info")
-        "error" | "Error" | "ERROR" => LevelFilter::Error,
+            .unwrap()
-        "warn" | "Warn" | "WARN" => LevelFilter::Warn,
+            .log_to_file(FileSpec::default())
-        "debug" | "Debug" | "DEBUG" => LevelFilter::Debug,
+            .start()
-        "trace" | "Trace" | "TRACE" => LevelFilter::Trace,
+            .unwrap();
-        _ => LevelFilter::Info,
+    } else {
-    };
+        let filter_env = std::env::var("RUST_LOG").unwrap_or_else(|_| "INFO".to_string());
-    std::env::set_var("RUST_LOG", format!("off,gupax={}", filter_env));
+        let filter = match filter_env.as_str() {
+            "error" | "Error" | "ERROR" => LevelFilter::Error,
+            "warn" | "Warn" | "WARN" => LevelFilter::Warn,
+            "debug" | "Debug" | "DEBUG" => LevelFilter::Debug,
+            "trace" | "Trace" | "TRACE" => LevelFilter::Trace,
+            _ => LevelFilter::Info,
+        };
+        std::env::set_var("RUST_LOG", format!("off,gupax={}", filter_env));
 
-    Builder::new()
+        Builder::new()
         .format(move |buf, record| {
             let level = record.level();
             let level_style = buf.default_level_style(level);
@@ -105,8 +113,9 @@ pub fn init_logger(now: Instant) {
         .parse_default_env()
         .format_timestamp_millis()
         .init();
+        info!("Log level ... {}", filter);
+    }
     info!("init_logger() ... OK");
-    info!("Log level ... {}", filter);
 }
 
 #[cold]

src/main.rs

@@ -62,7 +62,7 @@ fn main() {
     crate::panic::set_panic_hook(now);
 
     // Init logger.
-    init_logger(now);
+    init_logger(now, args.logfile);
     let mut app = App::new(now, args);
     init_auto(&mut app);