Read in config file or search appropriate places.

Add rough README and dependencies along with basic command line
arguments.

.githooks/pre-commit

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -e
+
+filesToFormat=$(
+  git --no-pager diff --name-status --no-color --cached | \
+    awk '$1 != "D" && $2 ~ /\.rs/ {print $2}'
+)
+
+for path in $filesToFormat
+do
+  rustfmt $path
+  git add $path
+done;

Cargo.toml

@@ -1,6 +1,15 @@
 [package]
 name = "homesync"
+authors = ["Joshua Potter <jrpotter.github.io>"]
+description = """
+
+Homesync provides a way of automatically syncing config files across various\
+applications you may use.
+"""
 version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+clap = { version = "3.0.0-rc.9", features = ["derive"] }
+notify = "4.0.16"
+yaml-rust = "0.4"

README.md

@@ -1 +1,42 @@
 # homesync
+
+**Caution! This is unstable code!**
+
+## Introduction
+
+Homesync provides a way of automatically syncing config files across various
+applications you may use. It works by establishing a file watcher on all the
+configs specified in the primary `homesync` config. As files are changed, they
+are copied to a local git repository to eventually be pushed by the user.
+Likewise, at any point, the user can sync against the remote repository,
+overwriting local configurations for one or more packages.
+
+## Installation
+
+TODO
+
+## Configuration
+
+Homesync uses a YAML file, to be found in anyone of the following locations.
+Locations are searched in the following order:
+
+• `$XDG_CONFIG_HOME/homesync/homesync.yml`
+• `$XDG_CONFIG_HOME/homesync.yml`
+• `$HOME/.config/homesync/homesync.yml`
+• `$HOME/.homesync.yml`
+
+That said, it is recommended to modify this config solely from the exposed
+homesync CLI. Homesync will take responsibility ensuring how the config is
+modified based on your package manager, platform, etc.
+
+## Usage
+
+TODO
+
+## Contribution
+
+Install git hooks as follows:
+
+```bash
+git config --local core.hooksPath .githooks/
+```

examples/config.yaml

@@ -0,0 +1,9 @@
+remote:
+system:
+packages:
+  homesync:
+    configs:
+      - $XDG_CONFIG_HOME/homesync/homesync.yml
+      - $XDG_CONFIG_HOME/homesync.yml
+      - $HOME/.config/homesync/homesync.yml
+      - $HOME/.homesync.yml

flake.nix

@@ -14,7 +14,9 @@
         devShell = with pkgs; mkShell {
           buildInputs = [
             cargo
+            rls
             rustc
+            rustfmt
           ] ++ lib.optionals stdenv.isDarwin [ libiconv ];
         };
       });

src/lib.rs

@@ -0,0 +1,57 @@
+use std::env;
+use std::error::Error;
+use std::fs;
+use std::io;
+use std::path::PathBuf;
+use yaml_rust::{Yaml, YamlLoader};
+
+fn read_config(path: &PathBuf) -> io::Result<Option<String>> {
+    match fs::read_to_string(path) {
+        Err(err) => match err.kind() {
+            // Ignore not found since we may try multiple paths.
+            io::ErrorKind::NotFound => Ok(None),
+            _ => Err(err),
+        },
+        Ok(contents) => Ok(Some(contents)),
+    }
+}
+
+fn find_config() -> Result<Vec<Yaml>, Box<dyn Error>> {
+    let mut paths: Vec<PathBuf> = Vec::new();
+    if let Ok(xdg_config_home) = env::var("XDG_CONFIG_HOME") {
+        paths.push(
+            [&xdg_config_home, "homesync", "homesync.yml"]
+                .iter()
+                .collect(),
+        );
+        paths.push([&xdg_config_home, "homesync.yml"].iter().collect());
+    }
+    if let Ok(home) = env::var("HOME") {
+        paths.push(
+            [&home, ".config", "homesync", "homesync.yml"]
+                .iter()
+                .collect(),
+        );
+        paths.push([&home, ".homesync.yml"].iter().collect());
+    }
+    for path in paths {
+        if let Ok(Some(contents)) = read_config(&path) {
+            return Ok(YamlLoader::load_from_str(&contents)?);
+        }
+    }
+    Err(Box::new(io::Error::new(
+        io::ErrorKind::NotFound,
+        "Could not find a homesync config.",
+    )))
+}
+
+pub fn run(config: Option<String>) -> Result<(), Box<dyn Error>> {
+    let _loaded = match config {
+        Some(path) => {
+            let contents = fs::read_to_string(path)?;
+            YamlLoader::load_from_str(&contents)?
+        }
+        None => find_config()?,
+    };
+    Ok(())
+}

src/main.rs

@@ -1,3 +1,17 @@
-fn main() {
+use clap::Parser;
-    println!("Hello, world!");
+use std::process;
+
+#[derive(Parser, Debug)]
+#[clap(about, version, author)]
+struct Args {
+    #[clap(short, long)]
+    config: Option<String>,
+}
+
+fn main() {
+    let args = Args::parse();
+    homesync::run(args.config).unwrap_or_else(|err| {
+        eprintln!("Problem parsing arguments: {}", err);
+        process::exit(1);
+    });
 }