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Fixed text alignment for output of "rustc -Z help"

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This commit is contained in:
inrustwetrust 2015-11-07 14:00:55 +01:00
parent d34daf38e8
commit 61bb652ada
1 changed files with 19 additions and 13 deletions
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32
src/librustc_driver/lib.rs
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@ -657,24 +657,30 @@ Available lint options:
fn describe_debug_flags() {
println!("\nAvailable debug options:\n");
for &(name, _, opt_type_desc, desc) in config::DB_OPTIONS {
let (width, extra) = match opt_type_desc {
Some(..) => (21, "=val"),
None => (25, "")
};
println!(" -Z {:>width$}{} -- {}", name.replace("_", "-"),
extra, desc, width=width);
}
print_flag_list("-Z", config::DB_OPTIONS);
}
fn describe_codegen_flags() {
println!("\nAvailable codegen options:\n");
for &(name, _, opt_type_desc, desc) in config::CG_OPTIONS {
let (width, extra) = match opt_type_desc {
Some(..) => (21, "=val"),
None => (25, "")
print_flag_list("-C", config::CG_OPTIONS);
}
fn print_flag_list<T>(cmdline_opt: &str,
flag_list: &[(&'static str, T, Option<&'static str>, &'static str)]) {
let max_len = flag_list.iter().map(|&(name, _, opt_type_desc, _)| {
let extra_len = match opt_type_desc {
Some(..) => 4,
None => 0
};
println!(" -C {:>width$}{} -- {}", name.replace("_", "-"),
name.chars().count() + extra_len
}).max().unwrap_or(0);
for &(name, _, opt_type_desc, desc) in flag_list {
let (width, extra) = match opt_type_desc {
Some(..) => (max_len - 4, "=val"),
None => (max_len, "")
};
println!(" {} {:>width$}{} -- {}", cmdline_opt, name.replace("_", "-"),
extra, desc, width=width);
}
}