Restructure command line args

src/cli.rs

@@ -1,4 +1,5 @@
 use std::path::PathBuf;
+use std::process;
 
 use chrono::NaiveDate;
 use directories::ProjectDirs;
@@ -18,12 +19,21 @@ pub struct Opt {
     /// File to load
     #[structopt(short, long, parse(from_os_str))]
     file: Option<PathBuf>,
-    /// Reformat the file
-    #[structopt(short, long)]
-    reformat: bool,
-    /// Reformat the file and all imports
-    #[structopt(short = "R", long)]
-    reformat_all: bool,
+    /// Number of the entry to view or edit
+    entry: Option<usize>,
+    #[structopt(subcommand)]
+    command: Option<Command>,
+}
+
+#[derive(Debug, StructOpt)]
+pub enum Command {
+    /// Shows entries in a range, or a single entry if one is specified
+    /// (default)
+    Show,
+    /// Marks an entry as done (requires entry)
+    Done,
+    /// Reformat all loaded files
+    Fmt,
 }
 
 fn default_file() -> PathBuf {
@@ -53,13 +63,23 @@ pub fn run() -> anyhow::Result<()> {
 
     let mut render = Render::new();
     render.render(&files, &entries, &layout);
-    print!("{}", render.display());
 
-    if opt.reformat_all {
-        files.mark_all_dirty();
-    } else if opt.reformat {
-        files.mark_main_dirty();
+    match opt.command {
+        None | Some(Command::Show) => match opt.entry {
+            None => print!("{}", render.display()),
+            // Some(i) => print!("{}", render::render_entry(&files, &entries, &layout, i)),
+            Some(i) => todo!(),
+        },
+        Some(Command::Done) => match opt.entry {
+            None => {
+                println!("Please specify an entry. See `today --help` for more details.");
+                process::exit(1);
+            }
+            Some(i) => todo!(),
+        },
+        Some(Command::Fmt) => files.mark_all_dirty(),
     }
+
     files.save()?;
     Ok(())
 }