feat(komorebic): add log command

This commit adds a log command directly to the komorebic cli to make it
easier for users to check the logs if they don't have tail installed or
are not familiar with it.

A separate logfile with ANSI color codes is now being written to the
user's tempdir, which is tailed by the log command until the process is
halted by a Ctrl-C signal.

Cargo.lock

@@ -274,6 +274,15 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "fs-tail"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73c8ee8694b2ad6d79aa976ad8572ca376c0450290041e6e3ae75147356b6ad2"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "fsevent"
 version = "0.4.0"
@@ -488,6 +497,7 @@ dependencies = [
  "clap",
  "color-eyre",
  "dirs",
+ "fs-tail",
  "komorebi-core",
  "paste",
  "powershell_script",
@@ -1151,9 +1161,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-core"
-version = "0.1.18"
+version = "0.1.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9ff14f98b1a4b289c6248a023c1c2fa1491062964e9fed67ab29c4e4da4a052"
+checksum = "2ca517f43f0fb96e0c3072ed5c275fe5eece87e8cb52f4a77b69226d3b1c9df8"
 dependencies = [
  "lazy_static",
 ]
@@ -1191,9 +1201,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-subscriber"
-version = "0.2.19"
+version = "0.2.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab69019741fca4d98be3c62d2b75254528b5432233fd8a4d2739fec20278de48"
+checksum = "b9cbe87a2fa7e35900ce5de20220a582a9483a7063811defce79d7cbd59d4cfe"
 dependencies = [
  "ansi_term",
  "chrono",

komorebi/src/main.rs

@@ -62,7 +62,7 @@ lazy_static! {
     ]));
 }
 
-fn setup() -> Result<WorkerGuard> {
+fn setup() -> Result<(WorkerGuard, WorkerGuard)> {
     if std::env::var("RUST_LIB_BACKTRACE").is_err() {
         std::env::set_var("RUST_LIB_BACKTRACE", "1");
     }
@@ -75,7 +75,9 @@ fn setup() -> Result<WorkerGuard> {
 
     let home = dirs::home_dir().context("there is no home directory")?;
     let appender = tracing_appender::rolling::never(home, "komorebi.log");
+    let color_appender = tracing_appender::rolling::never(std::env::temp_dir(), "komorebi.log");
     let (non_blocking, guard) = tracing_appender::non_blocking(appender);
+    let (color_non_blocking, color_guard) = tracing_appender::non_blocking(color_appender);
 
     tracing::subscriber::set_global_default(
         tracing_subscriber::fmt::Subscriber::builder()
@@ -85,6 +87,11 @@ fn setup() -> Result<WorkerGuard> {
                 tracing_subscriber::fmt::Layer::default()
                     .with_writer(non_blocking)
                     .with_ansi(false),
+            )
+            .with(
+                tracing_subscriber::fmt::Layer::default()
+                    .with_writer(color_non_blocking)
+                    .with_ansi(true),
             ),
     )?;
 
@@ -113,7 +120,7 @@ fn setup() -> Result<WorkerGuard> {
         }
     }));
 
-    Ok(guard)
+    Ok((guard, color_guard))
 }
 
 pub fn load_configuration() -> Result<()> {
@@ -167,7 +174,7 @@ fn main() -> Result<()> {
             }
 
             // File logging worker guard has to have an assignment in the main fn to work
-            let _guard = setup()?;
+            let (_guard, _color_guard) = setup()?;
 
             let process_id = WindowsApi::current_process_id();
             WindowsApi::allow_set_foreground_window(process_id)?;

komorebic/Cargo.toml

@@ -17,6 +17,7 @@ komorebi-core = { path = "../komorebi-core" }
 clap = "3.0.0-beta.4"
 color-eyre = "0.5"
 dirs = "3"
+fs-tail = "0.1"
 paste = "1"
 powershell_script = "0.2"
 serde = { version = "1", features = ["derive"] }

komorebic/src/main.rs

@@ -11,6 +11,7 @@ use clap::ArgEnum;
 use clap::Clap;
 use color_eyre::eyre::ContextCompat;
 use color_eyre::Result;
+use fs_tail::TailedFile;
 use paste::paste;
 use uds_windows::UnixListener;
 use uds_windows::UnixStream;
@@ -178,6 +179,8 @@ enum SubCommand {
     Stop,
     /// Show a JSON representation of the current window manager state
     State,
+    /// Tail komorebi.exe's process logs (cancel with Ctrl-C)
+    Log,
     /// Change focus to the window in the specified direction
     #[clap(setting = AppSettings::ArgRequiredElseHelp)]
     Focus(Focus),
@@ -277,6 +280,15 @@ fn main() -> Result<()> {
     let opts: Opts = Opts::parse();
 
     match opts.subcmd {
+        SubCommand::Log => {
+            let mut color_log = std::env::temp_dir();
+            color_log.push("komorebi.log");
+            let file = TailedFile::new(File::open(color_log)?);
+            let locked = file.lock();
+            for line in locked.lines() {
+                println!("{}", line?)
+            }
+        }
         SubCommand::Focus(arg) => {
             send_message(&*SocketMessage::FocusWindow(arg.operation_direction).as_bytes()?)?;
         }