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Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "charify"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+image = ">=0.24.1"
+clap = ">=3.1.8"

LICENSE

@@ -0,0 +1,16 @@
+Copyright (c) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,28 @@
+# charify - a command line utility to convert an image to an array of characters
+
+## Usage
+
+`charify [OPTIONS] --image <image> --destination <destination>`
+
+where 
+
+- `image` is the path to an existing image
+- `destination` is the path to a newly created text file
+
+and 
+
+OPTIONS:
+- `-c, --charset <charset>`
+  Set a new character set to use [default: "[' ', '░', '▒', '▓', '█']"]
+
+- `-h, --help`
+  Print help information
+
+- `-r, --new_dimensions <new_dimensions>`
+  Resize source image to specified dimensions
+
+### Examples
+
+- `charify ~/wallpapers/image.png ~/wallpapers/my_wallpaper_but_in_text.txt` 
+- `charify image.jpg textfile.txt -r 500x450`
+- `charify img.png charified.txt -c abcdefg`

src/main.rs

@@ -0,0 +1,196 @@
+/*
+Copyright (c) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+use std::io::Write;
+use std::process::exit;
+use clap::Arg;
+
+/// returns a character from a character set that corresponds to given brightness
+fn get_char(charset: &[char], brightness: &u8) -> char {
+    let charset_length = charset.len();
+    return charset[((charset_length * *brightness as usize) as u32 / 256) as usize];
+}
+
+/// returns a complete character map where each character corresponds to brightness in an image point
+fn charify(charset: &[char], brightness_map: &image::GrayImage) -> Vec<char> {
+    let mut character_map: Vec<char> = Vec::with_capacity(brightness_map.len());
+    for point in brightness_map.iter() {
+        let character = get_char(charset, point);
+        character_map.push(character);
+    }
+
+    return character_map;
+}
+
+
+fn main() {
+    let mut charset: Vec<char> = vec![' ', '░', '▒', '▓', '█'];
+
+    let matches = clap::Command::new("charify")
+        .version("0.1")
+        .author("Kasyanov Nikolay Alexeyevich (Unbewohnte)")
+        .arg(
+            Arg::new("image")
+                .help("Path to an existing image")
+                .takes_value(true)
+                .required(true)
+                .long("image")
+                .short('i')
+                .index(1)
+        )
+        .arg(
+            Arg::new("destination")
+                .help("Path to a newly created text file")
+                .takes_value(true)
+                .required(true)
+                .long("destination")
+                .short('d')
+                .index(2)
+        )
+        .arg(
+            Arg::new("new_dimensions")
+                .help("Resize source image to specified dimensions")
+                .takes_value(true)
+                .required(false)
+                .long("new_dimensions")
+                .short('r')
+        )
+        .arg(
+            Arg::new("charset")
+                .help("Set a new character set to use")
+                .takes_value(true)
+                .required(false)
+                .long("charset")
+                .short('c')
+                .default_value(&*format!("{:?}", charset))
+        )
+        .get_matches();
+
+    // check source path
+    let source_image_path: &std::path::Path;
+    match matches.value_of("image") {
+        Some(path) => {
+            source_image_path = std::path::Path::new(path);
+        }
+        None => {
+            eprintln!("[ERROR] source image is not specified !");
+            exit(1);
+        }
+    }
+    if !source_image_path.exists() {
+        eprintln!("[ERROR] \"{}\" does not exist", source_image_path.display());
+        exit(1);
+    } else if !source_image_path.is_file() {
+        eprintln!("[ERROR] \"{}\" is not a file", source_image_path.display());
+    }
+
+    let mut source_image: image::GrayImage;
+    match image::open(source_image_path) {
+        Ok(img) => {
+            source_image = img.to_luma8();
+        }
+        Err(e) => {
+            eprintln!("[ERROR] error opening a source image: {}", e);
+            exit(1);
+        }
+    }
+
+    // check destination path
+    let destination_file_path: &std::path::Path;
+    match matches.value_of("destination") {
+        Some(path) => {
+            destination_file_path = std::path::Path::new(path);
+        }
+        None => {
+            eprintln!("[ERROR] destination path is not specified !");
+            exit(1);
+        }
+    }
+    match destination_file_path.parent() {
+        Some(path) => {
+            match std::fs::create_dir_all(path) {
+                Ok(_) => {}
+                Err(e) => {
+                    eprintln!("[ERROR] could not create \"{}\": {}", path.display(), e);
+                    exit(1);
+                }
+            }
+        }
+        None => {}
+    }
+
+    let mut destination_file;
+    match std::fs::File::create(destination_file_path) {
+        Ok(file) => {
+            destination_file = file;
+        }
+        Err(e) => {
+            eprintln!("[ERROR] could not create destination file: {}", e);
+            exit(1);
+        }
+    }
+
+    // work with new dimensions if present
+    match matches.value_of("new_dimensions") {
+        Some(new_dimensions) => {
+            match new_dimensions.split_once('x') {
+                Some((nw_str, nh_str)) => {
+                    let new_width: u32 = nw_str.parse::<u32>().unwrap();
+                    let new_height: u32 = nh_str.parse::<u32>().unwrap();
+
+                    source_image = image::imageops::resize(
+                        &source_image, new_width, new_height,
+                        image::imageops::FilterType::Lanczos3);
+                }
+                None => {}
+            }
+        }
+        None => {}
+    }
+
+    // define a new character set if given
+    match matches.value_of("charset") {
+        Some(new_charset) => {
+            charset.clear();
+            for new_character in new_charset.chars() {
+                charset.push(new_character);
+            }
+        }
+        None => {}
+    }
+
+    // convert an image to a character map
+    let character_map = charify(&charset, &source_image);
+    for y in 0..source_image.height() {
+        for x in 0..source_image.width() {
+            match write!(destination_file, "{}", character_map[(y * source_image.width() + x) as usize]) {
+                Ok(_) => {}
+                Err(e) => {
+                    eprintln!("[ERROR] error writing to destination file: {}", e)
+                }
+            }
+        }
+        match write!(destination_file, "{}", "\n") {
+            Ok(_) => {}
+            Err(e) => {
+                eprintln!("[ERROR] error writing to destination file: {}", e)
+            }
+        }
+    }
+}