feat: connect to SQLite from the TUI

src/main.rs

@@ -1,4 +1,5 @@
 mod app;
+mod connection;
 mod db;
 
 use std::{error::Error, io::IsTerminal, path::Path, process::ExitCode};
@@ -12,7 +13,7 @@ Usage:
   dbdash --sqlite PATH
   dbdash --help
 
-With no argument, the connection is read from DATABASE_URL.
+With no argument or DATABASE_URL, the in-app connection screen opens.
 Prefer the environment variable to keep passwords out of process arguments:
   export DATABASE_URL='postgresql://user@localhost:5432/database'
   cargo run
@@ -33,6 +34,7 @@ Navigation:
   s             Toggle rows and column schema
   Left/Right    Scroll columns (h/l also work)
   n/p, PgDn/Up  Next / previous 100-row page
+  c             Open the connection screen (Esc keeps the current database)
   r             Refresh relations and the active relation
   q / Ctrl-C    Quit
 
@@ -66,11 +68,12 @@ fn run() -> Result<()> {
     }
     let sqlite = argument.as_ref().is_some_and(|arg| arg == "--sqlite");
     let connection = if sqlite {
-        args.next()
-            .ok_or("--sqlite requires a database file path; see dbdash --help")?
+        Some(
+            args.next()
+                .ok_or("--sqlite requires a database file path; see dbdash --help")?,
+        )
     } else {
         argument.or_else(|| std::env::var_os("DATABASE_URL"))
-            .ok_or("set DATABASE_URL, pass a PostgreSQL connection string, or use --sqlite PATH; see dbdash --help")?
     };
     if args.next().is_some() {
         return Err("unexpected extra arguments; see dbdash --help".into());
@@ -78,22 +81,30 @@ fn run() -> Result<()> {
     if !std::io::stdin().is_terminal() || !std::io::stdout().is_terminal() {
         return Err("an interactive terminal is required; see dbdash --help".into());
     }
-    let database = if sqlite {
-        db::Database::open_sqlite(Path::new(&connection))?
-    } else {
-        db::Database::connect(
-            connection
-                .to_str()
-                .ok_or("connection string must be UTF-8")?,
-        )?
-    };
-    let mut app = app::App::new(database)?;
+    let database = connection
+        .map(|connection| {
+            if sqlite {
+                db::Database::open_sqlite(Path::new(&connection))
+            } else {
+                db::Database::connect(
+                    connection
+                        .to_str()
+                        .ok_or("connection string must be UTF-8")?,
+                )
+            }
+        })
+        .transpose()?;
     let result = (|| {
         let mut terminal = ratatui::try_init()?;
-        app.run(&mut terminal)
+        crossterm::execute!(std::io::stdout(), crossterm::event::EnableBracketedPaste)?;
+        connection::run(&mut terminal, database)
     })();
+    let paste_result =
+        crossterm::execute!(std::io::stdout(), crossterm::event::DisableBracketedPaste);
     ratatui::restore();
-    result
+    result?;
+    paste_result?;
+    Ok(())
 }
 
 fn error_text(error: &(dyn Error + 'static)) -> String {