init

.gitignore

@@ -0,0 +1 @@
+/target

.vscode/launch.json

@@ -0,0 +1,45 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug executable 'hello-rust'",
+            "cargo": {
+                "args": [
+                    "build",
+                    "--bin=hello-rust",
+                    "--package=hello-rust"
+                ],
+                "filter": {
+                    "name": "hello-rust",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        },
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug unit tests in executable 'hello-rust'",
+            "cargo": {
+                "args": [
+                    "test",
+                    "--no-run",
+                    "--bin=hello-rust",
+                    "--package=hello-rust"
+                ],
+                "filter": {
+                    "name": "hello-rust",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        }
+    ]
+}

Cargo.lock

@@ -0,0 +1,109 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "autocfg"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
+
+[[package]]
+name = "device_query"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0500656e17fa3bf720de64b28b6fb28c3602307fc7afbb078c6643d836acaa28"
+dependencies = [
+ "input-event-codes",
+ "pkg-config",
+ "readkey",
+ "readmouse",
+ "winapi",
+ "x11",
+]
+
+[[package]]
+name = "hello-rust"
+version = "0.1.0"
+dependencies = [
+ "device_query",
+ "substring",
+ "text_io",
+]
+
+[[package]]
+name = "input-event-codes"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e5ce56b9cb50796f260af5d7ccd957727d5390e575b1917f2722bd9813faabd"
+
+[[package]]
+name = "libc"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9489c2807c139ffd9c1794f4af0ebe86a828db53ecdc7fea2111d0fed085d1"
+
+[[package]]
+name = "pkg-config"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "953ec861398dccce10c670dfeaf3ec4911ca479e9c02154b3a215178c5f566f2"
+
+[[package]]
+name = "readkey"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86d401b6d6a1725a59f1b4e813275d289dff3ad09c72b373a10a7a8217ba3146"
+
+[[package]]
+name = "readmouse"
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+checksum = "be105c72a1e6a5a1198acee3d5b506a15676b74a02ecd78060042a447f408d94"
+
+[[package]]
+name = "substring"
+version = "1.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42ee6433ecef213b2e72f587ef64a2f5943e7cd16fbd82dbe8bc07486c534c86"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "text_io"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d5f0c8eb2ad70c12a6a69508f499b3051c924f4b1cfeae85bfad96e6bc5bba46"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "x11"
+version = "2.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "502da5464ccd04011667b11c435cb992822c2c0dbde1770c988480d312a0db2e"
+dependencies = [
+ "libc",
+ "pkg-config",
+]

Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "text_scroller"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+device_query = "0.2.0"
+substring = "1.4.5"
+text_io = "0.1.12"

src/main.rs

@@ -0,0 +1,130 @@
+use std::thread;
+use std::time::Duration;
+use substring::Substring;
+use device_query::{DeviceQuery, DeviceState, Keycode};
+use std::sync::mpsc;
+
+#[macro_use] extern crate text_io;
+macro_rules! either {
+    ($test:expr => $true_expr:expr; $false_expr:expr) => {
+        if $test {
+            $true_expr
+        }
+        else {
+            $false_expr
+        }
+    }
+}
+fn main() {
+    
+    print!("Use the up/down arrow keys to adjust the update speed!\nleft/right controls the scroll direction!\nPlease enter a string: ");
+    let mut input: String = read!("{}\n");
+    // check the final character, add a space if there isn't one.
+    if input.chars().nth(input.len()) != Some(' ') {
+        input.push(' ');
+    }
+    
+    let mut i: i64 = 0;
+    
+    let (tx, rx) = mpsc::sync_channel(0);
+
+    let initial_polling_rate: u64 = 50;
+    let initial_scroll_left: bool = true;
+
+    // polling thread
+    thread::spawn(move || {
+        let mut polling_rate = initial_polling_rate;
+        let mut scroll_left = initial_scroll_left;
+        let device_state = DeviceState::new();
+
+        loop {
+            // Poll for input
+            let keys = device_state.get_keys(); // poll the keys
+            (polling_rate, scroll_left) = detect_keys(keys, polling_rate, scroll_left);
+            let _ = tx.send((polling_rate, scroll_left));
+            thread::sleep(Duration::from_millis(100)); // poll every 50 ms
+        }
+        
+    });
+    // main thread
+    let mut polling_rate = initial_polling_rate;
+    let mut scroll_left = initial_scroll_left;
+    loop {
+        // Get data from the polling thread
+        match rx.try_recv() {
+            Ok((new_rate, new_scroll)) => {
+                polling_rate = new_rate;
+                scroll_left = new_scroll;
+            }
+            Err(mpsc::TryRecvError::Empty) => {
+                //eprintln!("No new data. ;(");
+            }
+            Err(mpsc::TryRecvError::Disconnected) => {
+                eprintln!("Channel has been closed.");
+                break;
+            }
+        }
+        thread::sleep(Duration::from_millis(polling_rate));
+
+        println!("i: {}, upd: {}ms, scrll: {}, {}", {i +=1; i}, polling_rate, either!(scroll_left => "L"; "R"), input);
+        // Scroll text
+        if scroll_left {
+            input = shift_left(input);
+        } else {
+            input = shift_right(input);
+        }
+    }
+}
+
+fn shift_left(mut input: String) -> String {
+    let tmp: char = input.chars().nth(0).expect("char");
+    input = input.substring(1,input.len()).to_string();
+    input.push_str(&tmp.to_string());
+    return input;
+}
+
+fn shift_right(mut input: String) -> String {
+    let tmp: String = input.substring(0, input.len() - 1).to_string();
+    input = input.chars().nth(input.len() - 1).expect("char").to_string();
+    input.push_str(&tmp);
+    return input;
+}
+
+fn detect_keys(keys: Vec<Keycode>, mut polling_rate: u64, mut scroll_left: bool) -> (u64, bool) {
+    //detecting keydown events
+    //println!("{} {} ", polling_rate, scroll_left);
+    if keys.is_empty() {
+        return (polling_rate, scroll_left);
+    }
+    if keys.contains(&Keycode::Up) {
+        polling_rate = increase_poll(polling_rate);
+    }
+    if keys.contains(&Keycode::Down) {
+        polling_rate = decrease_poll(polling_rate)
+    }
+    if keys.contains(&Keycode::Left) {
+        scroll_left = true;
+    }
+    if keys.contains(&Keycode::Right) {
+        scroll_left = false;
+    }
+    return (polling_rate, scroll_left);
+}
+
+fn increase_poll(mut polling_rate: u64) -> u64 {
+    if polling_rate < 1000 {
+        polling_rate += 5;
+    } else {
+        eprintln!("polling rate can't go higher!");
+    }
+    return polling_rate;
+}
+
+fn decrease_poll(mut polling_rate: u64) -> u64 {
+    if polling_rate > 0 {
+        polling_rate -= 5;
+    } else {
+        eprintln!("polling rate can't go lower!");
+    }
+    return polling_rate;
+}