bjoernager/rust
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Center alignment for fmt

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Use '^' to specify center alignment in format strings.

fmt!( "[{:^5s}]", "Hi" ) -> "[ Hi  ]"
fmt!( "[{:^5s}]", "H" )  -> "[  H  ]"
fmt!( "[{:^5d}]", 1i )   -> "[  1  ]"
fmt!( "[{:^5d}]", -1i )  -> "[ -1  ]"
fmt!( "[{:^6d}]", 1i )   -> "[  1   ]"
fmt!( "[{:^6d}]", -1i )  -> "[  -1  ]"

If the padding is odd then the padding on the right will be one
character longer than the padding on the left.

Tuples squashed
This commit is contained in:
wickerwaka 2014-08-30 11:27:02 -07:00
parent 6d8b5c9f7d
commit 2bc4a5e92a
6 changed files with 33 additions and 9 deletions
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6
src/libfmt_macros/lib.rs
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@ -81,6 +81,8 @@ pub enum Alignment {
AlignLeft,
/// The value will be aligned to the right.
AlignRight,
/// The value will be aligned in the center.
AlignCenter,
/// The value will take on a default alignment.
AlignUnknown,
}
@ -279,7 +281,7 @@ impl<'a> Parser<'a> {
match self.cur.clone().next() {
Some((_, c)) => {
match self.cur.clone().skip(1).next() {
Some((_, '>')) | Some((_, '<')) => {
Some((_, '>')) | Some((_, '<')) | Some((_, '^')) => {
spec.fill = Some(c);
self.cur.next();
}
@ -293,6 +295,8 @@ impl<'a> Parser<'a> {
spec.align = AlignLeft;
} else if self.consume('>') {
spec.align = AlignRight;
} else if self.consume('^') {
spec.align = AlignCenter;
}
// Sign flags
if self.consume('+') {