From 5d541cb5c87ffb80262c753394f06f4449609b9b Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Wed, 31 Mar 2021 16:53:27 +0530
Subject: integrate pico args to main

---
 src/main.rs  | 81 ++++++++++++++++++++++++++++++------------------------------
 src/utils.rs | 21 ++++++++++++++--
 2 files changed, 60 insertions(+), 42 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 1b6e93a..9c186c9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 mod app;
 mod bitmap;
 mod brush;
+mod cli;
 mod command;
 mod consts;
 mod dither;
@@ -11,58 +12,58 @@ mod symmetry;
 mod undo;
 mod utils;
 
-use app::AppState;
-use error::{AppError, SdlTTFError};
-
-use std::{
-    env,
-    fs::OpenOptions,
-    io::{Cursor, Read},
-    path::PathBuf,
+use {
+    app::AppState,
+    cli::Config,
+    error::{AppError, SdlTTFError},
 };
 
 use log::{error, info};
-use obi::Image;
 
 pub fn error_sink() -> Result<(), AppError> {
-    env_logger::init();
+    let init = || {
+        let sdl_context = sdl2::init().map_err(AppError::Sdl)?;
+        info!("Initialized SDL context");
 
-    let sdl_context = sdl2::init().map_err(AppError::Sdl)?;
-    info!("Initialized SDL context");
+        let ttf_context = sdl2::ttf::init()
+            .map_err(SdlTTFError::Init)
+            .map_err(AppError::SdlTTF)?;
+        info!("Initialized SDL_ttf context");
+        Ok((sdl_context, ttf_context))
+    };
 
-    let ttf_context = sdl2::ttf::init().map_err(|e| AppError::SdlTTF(SdlTTFError::Init(e)))?;
-    info!("Initialized SDL_ttf context");
+    match cli::parse_args().map_err(AppError::Cli)? {
+        Config::Help => {
+            println!("{}", cli::HELP_TEXT);
+        }
 
-    let args: Vec<_> = env::args().collect();
-    if args.len() < 2 {
-        AppState::init(160, 160, &sdl_context, &ttf_context, None, None)?.run();
-        return Ok(());
-    } else {
-        let path = PathBuf::from(args.get(1).unwrap());
-        let mut image = OpenOptions::new()
-            .read(true)
-            .write(false)
-            .create(false)
-            .open(&path)
-            .map_err(AppError::File)?;
-        let mut buf = Vec::new();
-        image.read_to_end(&mut buf).map_err(AppError::File)?;
-        let decoded = Image::decode(&mut (Cursor::new(buf))).unwrap(); // TODO: obi error
-        let (width, height) = (decoded.width(), decoded.height());
-        AppState::init(
-            width,
-            height,
-            &sdl_context,
-            &ttf_context,
-            Some(decoded.data),
-            Some(&path),
-        )?
-        .run();
-        return Ok(());
+        Config::NewProject {
+            file_name,
+            dimensions: (width, height),
+        } => {
+            let (sdl_context, ttf_context) = init()?;
+            AppState::init(width, height, &sdl_context, &ttf_context, None, file_name)?.run();
+        }
+
+        Config::ExistingProject { file_name } => {
+            let (sdl_context, ttf_context) = init()?;
+            let image = utils::load_file(&file_name).map_err(AppError::File)?;
+            AppState::init(
+                image.width(),
+                image.height(),
+                &sdl_context,
+                &ttf_context,
+                Some(image.data),
+                Some(file_name),
+            )?
+            .run();
+        }
     }
+    return Ok(());
 }
 
 pub fn main() {
+    env_logger::init();
     match error_sink() {
         Err(e) => error!("{}", e),
         _ => (),
diff --git a/src/utils.rs b/src/utils.rs
index dcf652d..9859f39 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -4,15 +4,20 @@ use crate::{
     lisp::{
         error::{EvalError, LispError, ParseError},
         eval::Evaluator,
-        expr::LispExpr,
         lex::Lexer,
         parse::Parser,
     },
     message::Message,
 };
 
-use std::{fs::OpenOptions, io::Read, path::Path};
+use std::{
+    fs::OpenOptions,
+    io::{self, Cursor, Read},
+    path::Path,
+};
 
+use log::info;
+use obi::Image;
 use sdl2::{
     keyboard::{Keycode, Mod},
     pixels::Color,
@@ -91,3 +96,15 @@ pub fn load_script<P: AsRef<Path>>(path: P, app: &mut AppState) -> Result<(), Li
     }
     return Ok(());
 }
+
+pub fn load_file<P: AsRef<Path>>(path: P) -> Result<Image, io::Error> {
+    info!("loading existing file `{:?}`", path.as_ref());
+    let mut image = OpenOptions::new()
+        .read(true)
+        .write(false)
+        .create(false)
+        .open(&path)?;
+    let mut buf = Vec::new();
+    image.read_to_end(&mut buf)?;
+    Ok(Image::decode(&mut (Cursor::new(buf))).unwrap()) // TODO: obi erro
+}
-- 
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