basalt_cli.rs
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use clap::{ Args, Parser, Subcommand };
use std::fmt::{ self };
use std::io::{ self };
use std::path::{ Path, PathBuf };
use std::process::{ ExitCode };
// -------------------------------------------------------------------------------------------------
// Command line arguments
// -------------------------------------------------------------------------------------------------
#[derive(Parser)]
#[command(author, version, about, propagate_version = true)]
struct Arguments {
path: PathBuf,
#[command(subcommand)]
command: Command,
}
#[derive(Subcommand)]
enum Command {
/// Generates a new database file.
CreateDatabase,
/// Shows the contents of a database file.
ShowDatabase,
/// Adds a new table to the database.
AddTable(AddTableArguments),
}
#[derive(Args)]
struct AddTableArguments {
/// The name of the table to add.
name: String,
/// Add a column in the format `kind:name`.
#[arg(id="column", short, long)]
columns: Vec<String>,
}
impl Command {
fn run(&self, path: &Path) -> Result<()> {
match *self {
Command::CreateDatabase => {
let _ = basalt::create_database(path)?;
Ok(())
},
Command::ShowDatabase => {
let db = basalt::open_database(path)?;
println!("Database: {}", db.path().display());
for table in db.tables() {
println!(" - Table: {}", table.name());
for column in table.columns() {
println!(" - Column: {}:{}", column.kind(), column.name());
}
}
Ok(())
},
Command::AddTable(ref arguments) => {
let columns = arguments.columns
.iter()
.map(|column_definition| {
let column = basalt::parse_column(column_definition)?;
Ok(column)
})
.collect::<Result<Vec<_>>>()?;
let mut db = basalt::open_database(path)?;
db.add_table(&arguments.name, &columns)?;
db.synchronize()?;
Ok(())
}
}
}
}
// -------------------------------------------------------------------------------------------------
// Error handling
// -------------------------------------------------------------------------------------------------
type Result<T> = ::std::result::Result<T, Error>;
#[derive(Debug)]
enum Error {
FromBasalt(basalt::Error),
FromStdIo(io::Error),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use Error::*;
match *self {
FromBasalt(ref e) => write!(f, "Basalt error: {}", e),
FromStdIo(ref e) => write!(f, "IO error: {}", e),
}
}
}
impl From<io::Error> for Error {
fn from(e: io::Error) -> Error {
Error::FromStdIo(e)
}
}
impl From<basalt::Error> for Error {
fn from(e: basalt::Error) -> Error {
Error::FromBasalt(e)
}
}
// -------------------------------------------------------------------------------------------------
// Entry point
// -------------------------------------------------------------------------------------------------
fn main() -> ExitCode {
let arguments = Arguments::parse();
match arguments.command.run(&arguments.path) {
Ok(_) => ExitCode::SUCCESS,
Err(e) => {
eprintln!("{}", e);
ExitCode::FAILURE
}
}
}