Initial draft

.gitignore

@@ -20,3 +20,8 @@ Cargo.lock
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
+
+
+# Added by cargo
+
+/target

Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "motdgen"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+rand = "0.10.1"
+serde = { version = "1.0.228", features = ["derive"] }
+toml = "1.1.2"
+
+[profile.release]
+lto = true
+codegen-units = 1
+strip = true

src/ansi.rs

@@ -0,0 +1,9 @@
+pub const RESET: &str = "\x1b[0m";
+
+pub fn fg([r, g, b]: [u8; 3]) -> String {
+    format!("\x1b[38;2;{r};{g};{b}m")
+}
+
+pub fn bg([r, g, b]: [u8; 3]) -> String {
+    format!("\x1b[48;2;{r};{g};{b}m")
+}

src/config.rs

@@ -0,0 +1,25 @@
+use serde::Deserialize;
+use std::path::PathBuf;
+
+#[derive(Debug, Deserialize)]
+pub struct Config {
+    pub description: String,
+    pub ascii_art: String,
+    pub output: PathBuf,
+    pub colors: Colors,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Colors {
+    pub background: [u8; 3],
+    pub description: [u8; 3],
+    pub random_art: RandomColor,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct RandomColor {
+    pub enabled: bool,
+    pub r: [u8; 2],
+    pub g: [u8; 2],
+    pub b: [u8; 2],
+}

src/main.rs

@@ -0,0 +1,64 @@
+mod ansi;
+mod config;
+
+use ansi::{RESET, bg, fg};
+use config::{Config, RandomColor};
+
+use rand::RngExt;
+use std::{fmt::Write, fs, process};
+
+const CONFIG: &str = "/etc/motdgen/config.toml";
+
+fn random_rgb(cfg: &RandomColor) -> [u8; 3] {
+    let mut rng = rand::rng();
+
+    [
+        rng.random_range(cfg.r[0]..=cfg.r[1]),
+        rng.random_range(cfg.g[0]..=cfg.g[1]),
+        rng.random_range(cfg.b[0]..=cfg.b[1]),
+    ]
+}
+
+fn load_config() -> Result<Config, Box<dyn std::error::Error>> {
+    let raw = fs::read_to_string(CONFIG)?;
+    Ok(toml::from_str(&raw)?)
+}
+
+fn build_motd(cfg: &Config) -> String {
+    let art_fg = if cfg.colors.random_art.enabled {
+        fg(random_rgb(&cfg.colors.random_art))
+    } else {
+        fg(cfg.colors.description)
+    };
+
+    let art_bg = bg(cfg.colors.background);
+    let desc_fg = fg(cfg.colors.description);
+
+    let mut out = String::new();
+
+    for line in cfg.ascii_art.lines() {
+        let _ = writeln!(out, "{art_fg}{art_bg}    {line}    {RESET}");
+    }
+
+    out.push_str(&desc_fg);
+    out.push_str(&cfg.description);
+    out.push_str(RESET);
+    out.push('\n');
+
+    out
+}
+
+fn main() {
+    let cfg = match load_config() {
+        Ok(c) => c,
+        Err(e) => {
+            eprintln!("config error: {e}");
+            process::exit(1);
+        }
+    };
+
+    if let Err(e) = fs::write(&cfg.output, build_motd(&cfg)) {
+        eprintln!("write failed: {e}");
+        process::exit(1);
+    }
+}