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Added help.

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This commit is contained in:
PaddiM8 2020-06-13 21:56:13 +02:00
parent c50534a248
commit 3a25a3d416
1 changed files with 30 additions and 15 deletions
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45
kalk_cli/src/main.rs
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@ -21,22 +21,37 @@ fn main() {
break;
};
if arg == "-i" {
let file_name = &args.next().expect("Expected input file."); // The next argument will be the file name.
let mut file_content = String::new();
File::open(&file_name)
.expect("Couldn't find file.")
.read_to_string(&mut file_content)
.expect("Failed to read input file.");
match arg.as_ref() {
"-h" | "--help" => {
// The indentation... Will have to do something more scalable in the future.
println!(
"
-= kalk help =-\n
kalk [OPTIONS] [INPUT]
-h, --help : show this
-i : load a file with predefined functions/variables
"
);
return;
}
"-i" => {
let file_name = &args.next().expect("Expected input file."); // The next argument will be the file name.
let mut file_content = String::new();
File::open(&file_name)
.expect("Couldn't find file.")
.read_to_string(&mut file_content)
.expect("Failed to read input file.");
// Parse the input file content, resulting in the symbol table being filled out.
// Output is not needed here.
parser::eval(&mut parser_context, &file_content, 53)
.expect("Failed to parse input file.");
} else {
// Main argument. This is expected to be a maths expression.
// After the loop is finished, this will be parsed and outputted.
expr_input = Some(arg);
// Parse the input file content, resulting in the symbol table being filled out.
// Output is not needed here.
parser::eval(&mut parser_context, &file_content, 53)
.expect("Failed to parse input file.");
}
_ => {
// Main argument. This is expected to be a maths expression.
// After the loop is finished, this will be parsed and outputted.
expr_input = Some(arg);
}
}
}