[chg] rewrite current line with timestamp prefix after newline

timestamp marks the time when the line was "sent" or "committed"

.cargo/config.toml

@@ -0,0 +1,3 @@
+[build]
+rustflags = ["-C", "target-cpu=native", "-C", "strip=symbols"]
+target = "x86_64-unknown-linux-musl"

Cargo.lock

@@ -1,10 +1,12 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "autocfg"
-version = "1.0.1"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
 [[package]]
 name = "chrono"
@@ -21,9 +23,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.80"
+version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58d1b70b004888f764dfbf6a26a3b0342a1632d33968e4a179d8011c760614"
+checksum = "349d5a591cd28b49e1d1037471617a32ddcda5731b99419008085f72d5a53836"
 
 [[package]]
 name = "logtimes"
@@ -34,9 +36,9 @@ dependencies = [
 
 [[package]]
 name = "num-integer"
-version = "0.1.44"
+version = "0.1.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
+checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
 dependencies = [
  "autocfg",
  "num-traits",
@@ -44,9 +46,9 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.14"
+version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
 dependencies = [
  "autocfg",
 ]

Cargo.toml

@@ -2,13 +2,13 @@
 name = "logtimes"
 version = "0.1.0"
 authors = ["Paul Schulze <p.schulze@avm.de>"]
-edition = "2018"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+edition = "2021"
 
 [dependencies]
 chrono = "0.4"
 
 [profile.release]
-debug = false
 lto = true
+codegen-units = 1
+debug = false
+panic = "unwind"

src/main.rs

@@ -1,49 +1,65 @@
-use std::io::{Write, Read, ErrorKind, stdin, stdout};
 use chrono::prelude::*;
-
+use std::io::{stdin, stdout, ErrorKind, Read, StdoutLock, Write};
 
 #[inline(always)]
-fn print_time() {
+fn print_time(output: &mut StdoutLock) -> Result<(), std::io::Error> {
     let date_now = Local::now().format("%H:%M:%S%.9f");
 
     let color_green = "\x1b\x5b\x30\x3b\x33\x32\x6d";
     let color_off = "\x1b\x5b\x30\x6d";
 
-    print!("{}[{}]{} ", color_green, &date_now, color_off);
+    write!(output, "{}[{}]{} ", color_green, &date_now, color_off)
 }
 
+#[inline(always)]
+fn print_delete_line(output: &mut StdoutLock) -> Result<(), std::io::Error> {
+    // tput dl1 und tput hpa 0
+    let bytes = "\x1b\x5b\x4d\x1b\x5b\x31\x47";
+    write!(output, "{}", bytes)
+}
 
-fn main() {
+fn run() -> Result<(), std::io::Error> {
     let out = stdout();
     let mut output = out.lock();
 
     let inp = stdin();
     let mut input = inp.lock();
 
+    let mut buf = [0; 1];
+
+    let mut linebuf = Vec::with_capacity(64 * 1024);
 
-    print_time();
     loop {
-        let mut buf = [0; 1];
-
-        let _ = input.read_exact(&mut buf).map_err(|e| {
-
-            if e.kind() != ErrorKind::UnexpectedEof {
-                println!("{}", e.to_string());
-                std::process::exit(1);
+        if let Err(e) = input.read_exact(&mut buf) {
+            if e.kind() == ErrorKind::UnexpectedEof {
+                return Err(e);
+            } else {
+                output.flush()?;
+                return Ok(());
             }
+        }
 
-            let _ = output.flush();
-            std::process::exit(0);
-        });
-
+        linebuf.push(buf[0]);
 
         if buf[0] == 0xa {
-            print!("\n");
-            print_time();
+            print_delete_line(&mut output)?;
+            print_time(&mut output)?;
+            output.write_all(&linebuf)?;
+
+            output.flush()?;
+
+            linebuf.clear();
             continue;
         }
 
-        let _ = output.write_all(&mut buf);
-        let _ = output.flush();
+        output.write_all(&buf)?;
+        output.flush()?;
+    }
+}
+
+fn main() {
+    if let Err(e) = run() {
+        println!("{:?}", e);
+        std::process::exit(1);
     }
 }