line struct ha

src/line.rs

@@ -0,0 +1,36 @@
+use crate::{error::Error, stdout_handle};
+
+use anyhow::Result;
+use windows::Win32::System::Console;
+
+pub struct Line {
+    chars: Vec<char>,
+}
+
+impl Line {
+    pub fn new() -> Self {
+        Self { chars: Vec::new() }
+    }
+
+    /// adds a character to the end of the line
+    pub fn append(&mut self, c: char) {
+        self.chars.push(c)
+    }
+
+    pub fn clear(&mut self) {
+        self.chars.clear()
+    }
+
+    pub fn print(&self) -> Result<()> {
+        let s: String = self.chars.iter().collect();
+        unsafe {
+            Error::check(Console::WriteConsoleA(
+                stdout_handle()?,
+                s.as_bytes(),
+                None,
+                None,
+            ))?;
+        }
+        Ok(())
+    }
+}

src/main.rs

@@ -1,9 +1,9 @@
 mod error;
+mod line;
 mod log;
 
-use std::ffi::OsString;
+use line::Line;
 use windows::Win32::{Foundation::HANDLE, System::Console};
-use windows::{h, s, w};
 
 use anyhow::{Context, Result};
 
@@ -186,7 +186,7 @@ fn stdin_handle() -> Result<HANDLE> {
     }
 }
 
-fn stdout_handle() -> Result<HANDLE> {
+pub fn stdout_handle() -> Result<HANDLE> {
     unsafe {
         let handle = Console::GetStdHandle(Console::STD_OUTPUT_HANDLE)
             .context("unable to get stdin handle")?;
@@ -249,7 +249,7 @@ fn main() -> Result<()> {
     let stdin = stdin_handle()?;
     let stdout = stdout_handle()?;
     let mut buf = [Console::INPUT_RECORD::default(); 100];
-    let mut line = String::new();
+    let mut line = Line::new();
 
     loop {
         let mut n: u32 = 0;
@@ -306,19 +306,14 @@ fn main() -> Result<()> {
                                         None,
                                         None,
                                     ))?;
-                                    Error::check(Console::WriteConsoleA(
+                                    line.print()?;
-                                        stdout,
-                                        line.as_bytes(),
-                                        None,
-                                        None,
-                                    ))?;
                                     Error::check(Console::WriteConsoleA(
                                         stdout,
                                         "\r\n".as_bytes(),
                                         None,
                                         None,
                                     ))?;
-                                    line = String::new();
+                                    line.clear();
                                 }
                             } else if key_code == 74
                                 && (modifiers & Console::LEFT_CTRL_PRESSED
@@ -336,7 +331,7 @@ fn main() -> Result<()> {
                                     if !c.is_control() {
                                         let mut buf = [0 as u8; 8];
                                         let s = c.encode_utf8(&mut buf);
-                                        line.push_str(s);
+                                        s.chars().for_each(|c| line.append(c));
                                         Error::check(Console::WriteConsoleW(
                                             stdout,
                                             s.as_bytes(),