matthiasbeyer
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imag
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This commit is contained in:
Mario Krehl 2016-09-07 11:07:02 +02:00
parent c828bed0e1
commit d69b8498e9
1 changed files with 17 additions and 8 deletions
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25
bin/src/main.rs
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@ -20,6 +20,8 @@ use clap::{Arg, AppSettings, SubCommand};
use libimagrt::runtime::Runtime; use libimagrt::runtime::Runtime;
use libimagerror::trace::trace_error; use libimagerror::trace::trace_error;
/// Returns the helptext, putting the Strings in cmds as possible
/// subcommands into it
fn help_text(cmds: Vec<String>) -> String { fn help_text(cmds: Vec<String>) -> String {
let text = format!(r#" let text = format!(r#"
@ -60,7 +62,7 @@ fn help_text(cmds: Vec<String>) -> String {
text text
} }
/// Returns the list of imag-* executables found in $PATH
fn get_commands() -> Vec<String> { fn get_commands() -> Vec<String> {
let path = env::var("PATH"); let path = env::var("PATH");
if path.is_err() { if path.is_err() {
@ -108,11 +110,12 @@ fn get_commands() -> Vec<String> {
fn main() { fn main() {
// Initialize the Runtime and build the CLI
let appname = "imag"; let appname = "imag";
let version = &version!(); let version = &version!();
let about = "imag - the PIM suite for the commandline"; let about = "imag - the PIM suite for the commandline";
let commands = get_commands(); let commands = get_commands();
let helptext = help_text(commands); let helptext = help_text(commands.clone());
let app = Runtime::get_default_cli_builder(appname, version, about) let app = Runtime::get_default_cli_builder(appname, version, about)
.settings(&[AppSettings::AllowExternalSubcommands, AppSettings::ArgRequiredElseHelp]) .settings(&[AppSettings::AllowExternalSubcommands, AppSettings::ArgRequiredElseHelp])
.arg(Arg::with_name("version") .arg(Arg::with_name("version")
@ -139,6 +142,8 @@ fn main() {
debug!("matches: {:?}", matches); debug!("matches: {:?}", matches);
// Begin checking for arguments
if matches.is_present("version") { if matches.is_present("version") {
debug!("Showing version"); debug!("Showing version");
println!("imag {}", &version!()[..]); println!("imag {}", &version!()[..]);
@ -168,15 +173,19 @@ fn main() {
} }
} }
// Matches any subcommand given
match matches.subcommand() { match matches.subcommand() {
(subcommand, Some(scmd)) => { (subcommand, Some(scmd)) => {
debug!("Calling with subcommand: {}", subcommand); // Get all given arguments and further subcommands to pass to
// the imag-<> binary
// Providing no arguments is OK, and is therefore ignored here
let subcommand_args : Vec<&str> = match scmd.values_of("") { let subcommand_args : Vec<&str> = match scmd.values_of("") {
Some(values) => values.collect(), Some(values) => values.collect(),
None => Vec::new() None => Vec::new()
}; };
if !get_commands().contains(&String::from(subcommand)) { // Typos happen, so check if the given subcommand is one found in $PATH
if !commands.clone().contains(&String::from(subcommand)) {
println!("No such command: 'imag-{}'", subcommand); println!("No such command: 'imag-{}'", subcommand);
println!("See 'imag --help' for available subcommands"); println!("See 'imag --help' for available subcommands");
exit(2); exit(2);
@ -184,6 +193,7 @@ fn main() {
debug!("Calling 'imag-{}' with args: {:?}", subcommand, subcommand_args); debug!("Calling 'imag-{}' with args: {:?}", subcommand, subcommand_args);
// Create a Command, and pass it the gathered arguments
match Command::new(format!("imag-{}", subcommand)) match Command::new(format!("imag-{}", subcommand))
.stdin(Stdio::inherit()) .stdin(Stdio::inherit())
.stdout(Stdio::inherit()) .stdout(Stdio::inherit())
@ -223,9 +233,8 @@ fn main() {
} }
} }
}, },
// clap ensures we have valid input by exiting if not. // Calling for example 'imag --versions' will lead here, as this option does not exit.
// The above case is a catch-all for subcommands, // There's nothing to do in such a case
// so nothing else needs to be expexted. _ => {},
_ => unreachable!(),
} }
} }