commit 410e203f9ef97835550dd479bd49789b7782ce36
Author: Jurn Wubben <jsw@jsw.tf>
Date:   Tue Sep 23 21:13:21 2025 +0200

    Basic POC cli working

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7986c5a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/target
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diff --git a/Cargo.lock b/Cargo.lock
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index 0000000..b6baa49
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+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "naersk": {
+      "inputs": {
+        "fenix": "fenix",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1752689277,
+        "narHash": "sha256-uldUBFkZe/E7qbvxa3mH1ItrWZyT6w1dBKJQF/3ZSsc=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "0e72363d0938b0208d6c646d10649164c43f4d64",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1752077645,
+        "narHash": "sha256-HM791ZQtXV93xtCY+ZxG1REzhQenSQO020cu6rHtAPk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "be9e214982e20b8310878ac2baa063a961c1bdf6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1758446476,
+        "narHash": "sha256-5rdAi7CTvM/kSs6fHe1bREIva5W3TbImsto+dxG4mBo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a1f79a1770d05af18111fbbe2a3ab2c42c0f6cd0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs_2"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1752428706,
+        "narHash": "sha256-EJcdxw3aXfP8Ex1Nm3s0awyH9egQvB2Gu+QEnJn2Sfg=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "591e3b7624be97e4443ea7b5542c191311aa141d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..d452a09
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,37 @@
+{
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    naersk.url = "github:nix-community/naersk"; #https://github.com/nix-community/naersk
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = {
+    self,
+    flake-utils,
+    naersk,
+    nixpkgs,
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        pkgs = (import nixpkgs) {
+          inherit system;
+        };
+
+        naersk' = pkgs.callPackage naersk {};
+      in let
+        deps = [pkgs.pkg-config pkgs.openssl];
+      in {
+        # For `nix build` & `nix run`:
+        defaultPackage = naersk'.buildPackage {
+          name = "somcli";
+          src = ./.;
+          buildInputs = deps;
+        };
+
+        # For `nix develop` (optional, can be skipped):
+        devShell = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [rustc cargo rustfmt] ++ deps;
+        };
+      }
+    );
+}
diff --git a/src/dithering.rs b/src/dithering.rs
new file mode 100644
index 0000000..8006276
--- /dev/null
+++ b/src/dithering.rs
@@ -0,0 +1,46 @@
+use image::DynamicImage;
+
+pub fn atkinson_mono(img: &DynamicImage) -> Vec<u8> {
+    let mut gray = img.to_luma8();
+    let (w, h) = (gray.width() as usize, gray.height() as usize);
+    let pitch = (w + 7) >> 3;
+    let mut bits = vec![0u8; pitch * h];
+    let buf = gray.as_mut();
+
+    for y in 0..h {
+        let row = y * w;
+        for x in 0..w {
+            let i = row + x;
+            let old = buf[i];
+            let new = if old < 128 { 0 } else { 255 };
+            buf[i] = new;
+            let bit = new == 0;
+            if bit {
+                let byte = y * pitch + (x >> 3);
+                bits[byte] |= 128 >> (x & 7);
+            }
+            let err = ((old as i16) - (new as i16)) / 8;
+
+            if x + 1 < w {
+                buf[i + 1] = (buf[i + 1] as i16 + err).clamp(0, 255) as u8;
+            }
+            if x + 2 < w {
+                buf[i + 2] = (buf[i + 2] as i16 + err).clamp(0, 255) as u8;
+            }
+            if y + 1 < h {
+                let down = i + w;
+                if x > 0 {
+                    buf[down - 1] = (buf[down - 1] as i16 + err).clamp(0, 255) as u8;
+                }
+                buf[down] = (buf[down] as i16 + err).clamp(0, 255) as u8;
+                if x + 1 < w {
+                    buf[down + 1] = (buf[down + 1] as i16 + err).clamp(0, 255) as u8;
+                }
+                if y + 2 < h {
+                    buf[down + w] = (buf[down + w] as i16 + err).clamp(0, 255) as u8;
+                }
+            }
+        }
+    }
+    bits
+}
diff --git a/src/escpos.rs b/src/escpos.rs
new file mode 100644
index 0000000..d5c1b67
--- /dev/null
+++ b/src/escpos.rs
@@ -0,0 +1,46 @@
+use crate::dithering::atkinson_mono;
+use image::{DynamicImage, imageops::FilterType};
+
+const MAX_WIDTH: u32 = 384;
+
+pub enum ImageOrientation {
+    Preserve,
+    Largest,
+}
+
+pub fn escpos_raster(
+    img: &DynamicImage,
+    orientation: Option<ImageOrientation>,
+    mode: Option<u8>,
+) -> Vec<u8> {
+    let mode = mode.unwrap_or(0);
+    assert!(mode <= 3 || (48..=51).contains(&mode));
+
+    let (w, h) = (img.width(), img.height());
+    let swap = matches!(orientation, Some(ImageOrientation::Largest))
+        && h.min(MAX_WIDTH) * w > w.min(MAX_WIDTH) * h;
+
+    let (w, h) = if swap { (h, w) } else { (w, h) };
+    let (w, h) = (MAX_WIDTH, h.saturating_mul(MAX_WIDTH).div_ceil(w));
+
+    let img = if swap { &img.rotate90() } else { &img };
+    let img = img.resize(w, h, FilterType::Triangle);
+
+    let mono = atkinson_mono(&img);
+    let (width_px, height_px) = (img.width() as u16, img.height() as u16);
+    let width_bytes = ((width_px + 7) >> 3) as u16;
+
+    let mut out = Vec::with_capacity(8 + mono.len());
+    out.extend_from_slice(&[
+        0x1D,
+        0x76,
+        0x30,
+        mode,
+        width_bytes as u8,
+        (width_bytes >> 8) as u8,
+        height_px as u8,
+        (height_px >> 8) as u8,
+    ]);
+    out.extend_from_slice(&mono);
+    out
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..9de8881
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,27 @@
+mod dithering;
+mod escpos;
+
+use image::{ImageError, ImageReader};
+use std::{env, fs, io, io::Write, process};
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    let len = args.len();
+    if len < 2 || len > 2 {
+        println!("Please provide a path to the image.");
+        process::exit(1);
+    }
+
+    let img = ImageReader::open(&args[1])
+        .map_err(|err| ImageError::IoError(err))
+        .and_then(|v| v.decode())
+        .unwrap();
+
+    let mut escpos = escpos::escpos_raster(&img, Some(escpos::ImageOrientation::Largest), Some(0));
+    for _ in 0..2 {
+        escpos.push('\n' as u8);
+    }
+
+    io::stdout().write(&escpos).unwrap();
+}