From e96bb48e4df371e49d27bb7d93cf5393838d8137 Mon Sep 17 00:00:00 2001
From: PlexSheep <software@cscherr.de>
Date: Fri, 10 May 2024 15:55:24 +0200
Subject: [PATCH] first working version

---
 Cargo.toml  |  13 +++--
 README.md   |   5 +-
 src/main.rs | 141 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 150 insertions(+), 9 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 0543e1f..9f77ac8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,16 +1,19 @@
 [package]
-name = "template"
+name = "numf"
 version = "0.1.0"
 edition = "2021"
 publish = false
 authors = ["Christoph J. Scherr <software@cscherr.de>"]
 license = "MIT"
-description = "No description yet"
+description = "Convert numbes between formats"
 readme = "README.md"
-homepage = "https://git.cscherr.de/PlexSheep/rs-base"
-repository = "https://git.cscherr.de/PlexSheep/rs-base"
-keywords = ["template"]
+homepage = "https://git.cscherr.de/PlexSheep/numf"
+repository = "https://git.cscherr.de/PlexSheep/numf"
+keywords = ["cli"]
 
 
 [dependencies]
+anyhow = "1.0.83"
+clap = { version = "4.5.4", features = ["derive"] }
+clap-num = "1.1.1"
 
diff --git a/README.md b/README.md
index a27185f..b6a058b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
-# rs-base
+# numf
 
-Base repository for rust projects
\ No newline at end of file
+This is just a trivial program that format's it's arguments in binary, hex or
+octal.
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..a1e8414 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,140 @@
-fn main() {
-    println!("Hello, world!");
+//! # numf
+//!
+//! This binary should just take any amount of numbers and print them out formatted to some other
+//! system.
+
+use clap::{ArgGroup, Parser};
+use clap_num::maybe_hex;
+use std::process::exit;
+
+pub type Num = usize;
+
+#[derive(Copy, Clone, Debug)]
+enum Format {
+    Dec,
+    Hex,
+    Bin,
+    Octal,
+}
+
+impl Format {
+    fn prefix(&self) -> String {
+        match self {
+            Format::Dec => "0d",
+            Format::Hex => "0x",
+            Format::Bin => "0b",
+            Format::Octal => "0o",
+        }
+        .to_string()
+    }
+    fn format(&self, num: Num, prefix: bool) -> String {
+        let mut buf = String::new();
+        if prefix {
+            buf += &self.prefix();
+        }
+        match self {
+            Format::Hex => {
+                buf += &format!("{num:X}");
+            }
+            Format::Bin => {
+                buf += &format!("{num:b}");
+            }
+            Format::Octal => {
+                buf += &format!("{num:o}");
+            }
+            Format::Dec => {
+                buf += &format!("{num}");
+            }
+        }
+        buf
+    }
+}
+
+#[derive(Parser, Debug)]
+#[clap(author, version, about, long_about = None)]
+#[clap(group(
+            ArgGroup::new("format")
+                .required(true)
+                .args(&["hex", "bin", "oct", "dec"]),
+        ))]
+struct Cli {
+    #[arg(short, long)]
+    /// add a prefix (like "0x" for hex)
+    prefix: bool,
+    #[arg(short = 'x', long)]
+    /// format to hexadecimal
+    hex: bool,
+    #[arg(short, long)]
+    /// format to binary
+    bin: bool,
+    #[arg(short, long)]
+    /// format to decimal
+    dec: bool,
+    #[arg(short, long)]
+    /// format to octal
+    oct: bool,
+    #[clap(value_parser=maybe_hex::<Num>)]
+    /// at least one number that should be formatted
+    ///
+    /// supports either base 10 or base 16 inputs (with 0xaaaa)
+    numbers: Vec<Num>,
+}
+
+impl Cli {
+    fn format(&self) -> Format {
+        if self.oct {
+            Format::Octal
+        } else if self.bin {
+            Format::Bin
+        } else if self.dec {
+            Format::Dec
+        } else {
+            Format::Hex
+        }
+    }
+}
+
+fn main() {
+    match formatter() {
+        Ok(_) => (),
+        Err(_err) => usage(),
+    }
+}
+
+fn formatter() -> anyhow::Result<()> {
+    let cli = Cli::parse();
+
+    let mut out: Vec<String> = Vec::new();
+
+    for num in &cli.numbers {
+        out.push(cli.format().format(*num, cli.prefix));
+    }
+    for o in out {
+        println!("{o}")
+    }
+
+    Ok(())
+}
+
+fn help() {
+    let help: String = format!(
+        r##"numf {}
+
+    -h, --help      print this help
+    -p, --prefix    print a prefix before the formatted number
+    -b, --binary    format to binary
+    -o, --octal     format to octal
+    -x, --hex       format to hex (default)
+
+    Author: Christoph J. Scherr 2024
+    "##,
+        env!("CARGO_PKG_VERSION")
+    );
+    println!("{help}");
+    exit(1);
+}
+
+fn usage() {
+    println!("Usage: numf -hpbox NUMBER\n");
+    exit(1);
 }