navigine/hexyl
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Get rid of the use of str.repeat()

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This allocates a string. Instead we can (ab)use format specifiers to do
the repetitions for us.
This commit is contained in:
Lily Ballard authored and David Peter committed 2019-01-10 07:56:42 +01:00
1 parent 2e403a2d11
commit 7b7a0ff32d
1 file changed
+15 -25
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src/main.rs
+15 -25
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@@ -92,25 +92,19 @@ impl<'a> Printer<'a> {
fn header(&mut self) {
writeln!(
self.stdout,
"┌{}┬{}┬{}┬{}┬{}┐",
"─".repeat(8),
"─".repeat(3 * 8 + 1),
"─".repeat(3 * 8 + 1),
"─".repeat(8),
"─".repeat(8)
).ok();
"┌{0:─<8}┬{0:─<25}┬{0:─<25}┬{0:─<8}┬{0:─<8}┐",
""
)
.ok();
}
fn footer(&mut self) {
writeln!(
self.stdout,
"└{}┴{}┴{}┴{}┴{}┘",
"─".repeat(8),
"─".repeat(3 * 8 + 1),
"─".repeat(3 * 8 + 1),
"─".repeat(8),
"─".repeat(8)
).ok();
"└{0:─<8}┴{0:─<25}┴{0:─<25}┴{0:─<8}┴{0:─<8}┘",
""
)
.ok();
}
fn print_byte(&mut self, b: u8) -> io::Result<()> {
@@ -146,12 +140,13 @@ impl<'a> Printer<'a> {
if len < 8 {
write!(
self.stdout,
"{}┊{}│",
" ".repeat(3 * (8 - len)),
" ".repeat(1 + 3 * 8)
"{0:1$}┊{0:2$}│",
"",
3 * (8 - len),
1 + 3 * 8
)?;
} else {
write!(self.stdout, "{}│", " ".repeat(3 * (16 - len)))?;
write!(self.stdout, "{0:1$}│", "", 3 * (16 - len))?;
}
let mut idx = 1;
@@ -167,14 +162,9 @@ impl<'a> Printer<'a> {
}
if len < 8 {
writeln!(
self.stdout,
"{}┊{}│ ",
" ".repeat(8 - len),
" ".repeat(8)
)?;
writeln!(self.stdout, "{0:1$}┊{0:2$}│ ", "", 8 - len, 8)?;
} else {
writeln!(self.stdout, "{}│", " ".repeat(16 - len))?;
writeln!(self.stdout, "{0:1$}│", "", 16 - len)?;
}
self.line.clear();