more basic features, config gets read and startup messages

crates/app/Cargo.toml

@@ -6,8 +6,11 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-clap = { workspace = true, features = [ "derive" ] }
+clap = { workspace = true, features = [ "derive", "env" ] }
 serde = { workspace = true, features = [ "derive" ] }
 ron = { workspace = true }
 serde_json = { workspace = true } 
 ariadne = "0.4"
+time = { version = "0.3", features = [ "local-offset" ] }
+dirs = "5"
+owo-colors = "4"

crates/app/src/main.rs

@@ -1,48 +1,124 @@
-use crate::{config::Configs, error_reporting::report_serde_json_err};
+use clap::Parser;
+use cli::Args;
+use welcome_msg::print_startup_msg;
+
+use crate::config::Configs;
 
 mod cli {
-    use clap::{Parser, Subcommand};
+    use std::path::PathBuf;
+
+    use clap::Parser;
 
     #[derive(Parser)]
-    struct Args {
-        #[command(subcommand)]
-        command: Command,
+    pub(crate) struct Args {
+        /// Read this config file.
+        #[arg(short, long)]
+        pub config_file: Option<PathBuf>,
+        #[arg(long, env = "NO_STARTUP_MESSAGE", default_value = "false")]
+        pub no_startup_message: bool,
     }
-
-    #[derive(Clone, Subcommand)]
-    enum Command {}
 }
 
 mod config {
+    use std::{
+        fs,
+        path::{Path, PathBuf},
+        process,
+    };
+
     use serde::{Deserialize, Serialize};
 
+    use crate::error_reporting::{report_serde_json_err, report_serde_ron_err};
+
     #[derive(Debug, Serialize, Deserialize)]
-    pub struct Configs<'a> {
-        example_value: i32,
-        example_string: &'a str,
+    pub struct Configs {
+        #[serde(default = "default_example_value")]
+        pub example_value: i32,
+        #[serde(default = "default_no_startup_msg")]
+        pub no_startup_message: bool,
     }
 
-    impl Configs<'_> {
-        pub fn read_json(config_text: &str) -> serde_json::Result<Configs<'_>> {
-            serde_json::from_str(config_text)
+    /// what the fuck serde why do i need this
+    fn default_example_value() -> i32 {
+        43
+    }
+    fn default_no_startup_msg() -> bool {
+        false
+    }
+
+    impl Configs {
+        pub fn read(custom_path: Option<PathBuf>) -> Self {
+            use owo_colors::OwoColorize;
+            let p = match custom_path {
+                Some(p) => p,
+                None => {
+                    let config_path = dirs::config_dir().expect("config dir should exist");
+
+                    let ron_path = config_path.with_file_name("config.ron");
+                    let json_path = config_path.with_file_name("config.json");
+
+                    if Path::new(&ron_path).exists() {
+                        ron_path
+                    } else if Path::new(&json_path).exists() {
+                        json_path
+                    } else {
+                        eprintln!("{}: couldn't find config file", "Fatal error".red());
+                        process::exit(1)
+                    }
+                }
+            };
+
+            match p.extension().map(|v| v.to_str().unwrap()) {
+                Some("ron") => Self::read_json(&fs::read_to_string(p).unwrap()),
+                Some("json") => Self::read_ron(&fs::read_to_string(p).unwrap()),
+                None | Some(_) => {
+                    eprintln!(
+                        "{}: couldn't determine config file type",
+                        "Fatal error".red()
+                    );
+                    process::exit(1)
+                }
+            }
+        }
+        pub fn read_json(config_text: &str) -> Configs {
+            match serde_json::from_str(config_text) {
+                Ok(c) => c,
+                Err(e) => report_serde_json_err(config_text, e),
+            }
+        }
+
+        pub fn read_ron(config_text: &str) -> Configs {
+            match ron::from_str(config_text) {
+                Ok(c) => c,
+                Err(e) => report_serde_ron_err(config_text, e),
+            }
         }
     }
 }
 
 mod error_reporting {
-    use std::{ops::Range, process};
+    use std::process;
 
-    use ariadne::{Report, Source};
+    use ron::error::Position;
 
     pub fn report_serde_json_err(src: &str, err: serde_json::Error) -> ! {
-        use ariadne::{Color, ColorGenerator, Fmt, Label, Report, ReportKind, Source};
-        let offset = try_reconstruct_loc(src, err.line(), err.column());
+        report_serde_err(src, err.line(), err.column(), err.to_string())
+    }
+
+    pub fn report_serde_ron_err(src: &str, err: ron::error::SpannedError) -> ! {
+        let Position { line, col } = err.position;
+        report_serde_err(src, line, col, err.to_string())
+    }
+
+    pub fn report_serde_err(src: &str, line: usize, col: usize, msg: String) -> ! {
+        use ariadne::{Label, Report, Source};
+        let offset = try_reconstruct_loc(src, line, col);
 
         Report::build(ariadne::ReportKind::Error, "test", offset)
             .with_label(
                 Label::new(("test", offset..offset)).with_message("Something went wrong here!"),
             )
-            .with_message(err.to_string())
+            .with_message(msg)
             .with_note(
                 "We'd like to give better errors, but serde errors are horrible to work with...",
             )
@@ -54,25 +130,37 @@ mod error_reporting {
     fn try_reconstruct_loc(src: &str, line_nr: usize, col_nr: usize) -> usize {
         let (line_nr, col_nr) = (line_nr - 1, col_nr - 1);
 
-        src.lines().enumerate().fold(0, |acc, (i, line)| {
-            if i < line_nr {
-                acc + line.len()
-            } else if i == line_nr {
-                acc + col_nr
-            } else {
-                acc
-            }
-        })
+        src.lines()
+            .enumerate()
+            .fold(0, |acc, (i, line)| match i.cmp(&line_nr) {
+                std::cmp::Ordering::Less => acc + line.len() + 1,
+                std::cmp::Ordering::Equal => acc + col_nr,
+                std::cmp::Ordering::Greater => acc,
+            })
+    }
+}
+
+mod welcome_msg {
+    use time::{Month, OffsetDateTime};
+
+    pub fn print_startup_msg() {
+        // now or fallback to utc
+        let now = OffsetDateTime::now_local().unwrap_or_else(|_| OffsetDateTime::now_utc());
+
+        if now.month() == Month::June {
+            println!("Hello, thanks for using iOwO and happy pride month!");
+            println!("Why pride month is important in {}", now.year());
+        } else {
+            println!("Hello, thanks for using iOwO! :3");
+        }
     }
 }
 
 fn main() {
-    const TEST_JSON_CONFIG: &str = "{ \"example_value\": 42, \"example_string\": \"meow\" }";
-    const TEST_JSON_CONFIG_BROKEN: &str = "{ 
-    \"example_value\": \"42\", 
-    \"example_string\": \"meow\" 
-}";
+    let args = Args::parse();
+    let cfg = Configs::read(args.config_file);
 
-    dbg!(Configs::read_json(TEST_JSON_CONFIG_BROKEN)
-        .map_err(|e| report_serde_json_err(TEST_JSON_CONFIG_BROKEN, e)));
+    if !(args.no_startup_message || cfg.no_startup_message) {
+        print_startup_msg();
+    }
 }