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|
use std::{
default::Default,
fmt,
path::{Path, PathBuf},
};
pub static HELP_TEXT: &str = "
Usage
-----
pala new <FILE> -d WIDTHxHEIGHT
Options
-------
-h, --help Prints help information
-d, Specify dimensions for new file (default: 200x200)
";
#[derive(Debug)]
pub enum CliError {
NoDimensions,
FileAlreadyExists,
FileDoesNotExist,
DimensionParseError,
NewRequiresFile,
InvalidSubCommand(String),
SubCommandParseError,
}
impl fmt::Display for CliError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::NoDimensions => write!(f, "no dimensions provided"),
Self::FileAlreadyExists => {
write!(f, "cannot initialize project, file already exists")
}
Self::FileDoesNotExist => {
write!(f, "cannot open existing project, file does not exist")
}
Self::DimensionParseError => write!(f, "invalid dimension string"),
Self::NewRequiresFile => write!(f, "new subcommand requires file name"),
Self::InvalidSubCommand(s) => write!(f, "invalid subcommand `{}`", s),
Self::SubCommandParseError => write!(f, "error parsing subcommand"),
}
}
}
impl std::error::Error for CliError {}
#[derive(Debug)]
pub enum Config {
NewProject {
file_name: Option<PathBuf>,
dimensions: (u32, u32),
},
ExistingProject {
file_name: PathBuf,
},
Help,
}
impl Default for Config {
fn default() -> Self {
Self::NewProject {
file_name: None,
dimensions: (200, 200),
}
}
}
pub fn parse_args() -> Result<Config, CliError> {
let mut args = pico_args::Arguments::from_env();
if args.contains(["-h", "--help"]) {
return Ok(Config::Help);
}
match args.subcommand() {
Ok(cmd) => match cmd.as_deref() {
Some("new") => new_project(&mut args),
Some(s) => {
if !Path::new(s).is_file() {
return Err(CliError::FileDoesNotExist);
}
Ok(Config::ExistingProject {
file_name: PathBuf::from(s),
})
}
None => Ok(Config::Help),
},
_ => Err(CliError::SubCommandParseError),
}
}
fn new_project(args: &mut pico_args::Arguments) -> Result<Config, CliError> {
let file_name = args.free_from_str();
if let Ok(f) = &file_name {
if Path::new(&f).is_file() {
return Err(CliError::FileAlreadyExists);
}
}
let dimensions = args
.opt_value_from_fn(["-d", "--dimensions"], parse_dimensions)
.map_err(|_| CliError::DimensionParseError)?
.unwrap_or((200, 200));
Ok(Config::NewProject {
file_name: file_name.ok(),
dimensions,
})
}
fn parse_dimensions(input: &str) -> Result<(u32, u32), CliError> {
let dimensions: Vec<&str> = input.split('x').collect();
match &dimensions[..] {
[width, height] => Ok((
width
.parse::<u32>()
.map_err(|_| CliError::DimensionParseError)?,
height
.parse::<u32>()
.map_err(|_| CliError::DimensionParseError)?,
)),
_ => Err(CliError::DimensionParseError),
}
}
|
