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Use impl Write over a closure

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This commit is contained in:
Paul Campbell 2023-03-23 08:09:58 +00:00
parent a31d0f769a
commit 20263c9474
2 changed files with 46 additions and 63 deletions
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99
src/lib.rs
View file

@ -1,8 +1,11 @@
use clap::Parser;
use std::fmt::{Debug, Formatter};
use std::fmt::Debug;
use std::fs;
use std::io::Write;
use std::path::PathBuf;
pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
#[derive(Parser, Debug)]
#[command(version)]
pub struct Cli {
@ -26,58 +29,44 @@ pub struct Cli {
ignore_extras: bool,
}
pub struct SkipError(String);
impl Debug for SkipError {
fn fmt(&self, f: &mut Formatter<'_>) -> core::result::Result<(), std::fmt::Error> {
write!(f, "{}", self.0)
}
}
pub type Result<T> = core::result::Result<T, SkipError>;
pub fn skip<F>(cli: &Cli, out: F) -> Result<()>
where
F: FnMut(String) -> (),
{
pub fn skip(cli: &Cli, writer: &mut impl Write) -> Result<()> {
match &cli.file {
Some(ref file) => {
if let Some(line) = &cli.line {
skip_file_lines_matching(&cli, out, file, line)
skip_file_lines_matching(&cli, writer, file, line)
} else if let Some(ref token) = cli.token {
skip_file_tokens(cli, out, file, token)
skip_file_tokens(cli, writer, file, token)
} else {
skip_file_lines(cli, out, file)
skip_file_lines(cli, writer, file)
}
}
None => Err(SkipError("Not yet implemented - reading from stdin".into())),
None => todo!("reading from stdin"),
}
}
fn skip_file_lines<F>(cli: &Cli, mut out: F, file: &PathBuf) -> Result<()>
where
F: FnMut(String) -> (),
{
fn skip_file_lines(cli: &Cli, writer: &mut impl Write, file: &PathBuf) -> Result<()> {
let content = fs::read_to_string(file).expect("Could not read file");
let mut counter = 0usize;
for current_line in content.lines() {
if counter >= cli.lines {
out(String::from(current_line));
writeln!(writer, "{}", current_line)?;
}
counter += 1;
}
Ok(())
}
fn skip_file_lines_matching<F>(cli: &Cli, mut out: F, file: &PathBuf, line: &str) -> Result<()>
where
F: FnMut(String) -> (),
{
fn skip_file_lines_matching(
cli: &Cli,
writer: &mut impl Write,
file: &PathBuf,
line: &str,
) -> Result<()> {
let content = fs::read_to_string(file).expect("Could not read file");
let mut counter = 0usize;
for current_line in content.lines() {
if counter >= cli.lines {
out(String::from(current_line));
writeln!(writer, "{}", current_line)?;
}
if line == current_line {
counter += 1;
@ -86,15 +75,12 @@ where
Ok(())
}
fn skip_file_tokens<F>(cli: &Cli, mut out: F, file: &PathBuf, token: &str) -> Result<()>
where
F: FnMut(String) -> (),
{
fn skip_file_tokens(cli: &Cli, writer: &mut impl Write, file: &PathBuf, token: &str) -> Result<()> {
let content = fs::read_to_string(file).expect("Could not read file");
let mut counter = 0usize;
for current_line in content.lines() {
if counter >= cli.lines {
out(String::from(current_line));
writeln!(writer, "{}", current_line)?;
}
if current_line.contains(&token) {
if cli.ignore_extras {
@ -123,13 +109,13 @@ mod tests {
token: None,
ignore_extras: false,
};
let mut lines: Vec<String> = Vec::new();
let mut lines = Vec::new();
//when
skip(&cli, |line| lines.push(line))?;
skip(&cli, &mut lines)?;
//then
assert_eq!(lines, vec!["line 2"]);
assert_eq!(String::from_utf8(lines)?, "line 2\n");
Ok(())
}
@ -143,13 +129,13 @@ mod tests {
token: None,
ignore_extras: false,
};
let mut lines: Vec<String> = Vec::new();
let mut lines = Vec::new();
//when
skip(&cli, |line| lines.push(line))?;
skip(&cli, &mut lines)?;
//then
assert_eq!(lines, vec!["alpha", "gamma"]);
assert_eq!(String::from_utf8(lines)?, vec!["alpha", "gamma\n"].join("\n"));
Ok(())
}
@ -163,13 +149,13 @@ mod tests {
token: None,
ignore_extras: false,
};
let mut lines: Vec<String> = Vec::new();
let mut lines = Vec::new();
//when
skip(&cli, |line| lines.push(line))?;
skip(&cli, &mut lines)?;
//then
assert_eq!(lines, vec!["gamma"]);
assert_eq!(String::from_utf8(lines)?, "gamma\n");
Ok(())
}
@ -183,19 +169,20 @@ mod tests {
token: Some(String::from("one")),
ignore_extras: false,
};
let mut lines: Vec<String> = Vec::new();
let mut lines = Vec::new();
//when
skip(&cli, |line| lines.push(line))?;
skip(&cli, &mut lines)?;
//then
assert_eq!(
lines,
String::from_utf8(lines)?,
vec![
"Or help one fainting robin",
"Unto his nest again,",
"I shall not live in vain."
"I shall not live in vain.\n"
]
.join("\n")
);
Ok(())
}
@ -210,14 +197,14 @@ mod tests {
token: Some(String::from("or")),
ignore_extras: false,
};
let mut lines: Vec<String> = Vec::new();
let mut lines = Vec::new();
//when
skip(&cli, |line| lines.push(line))?;
skip(&cli, &mut lines)?;
//then
assert_eq!(
lines,
String::from_utf8(lines)?,
vec![
//Lorem ipsum dolor sit amet, -- +2 = 2
//consectetur adipiscing elit,
@ -226,8 +213,9 @@ mod tests {
"Ut enim ad minim veniam,",
"quis nostrud exercitation ullamco",
"laboris nisi ut aliquip ex ea",
"commodo consequat."
"commodo consequat.\n"
]
.join("\n")
);
Ok(())
}
@ -242,14 +230,14 @@ mod tests {
token: Some(String::from("or")),
ignore_extras: true,
};
let mut lines: Vec<String> = Vec::new();
let mut lines = Vec::new();
//when
skip(&cli, |line| lines.push(line))?;
skip(&cli, &mut lines)?;
//then
assert_eq!(
lines,
String::from_utf8(lines)?,
vec![
//Lorem ipsum dolor sit amet, -- 1
//consectetur adipiscing elit,
@ -258,8 +246,9 @@ mod tests {
//Ut enim ad minim veniam,
//quis nostrud exercitation ullamco
//laboris nisi ut aliquip ex ea -- 4
"commodo consequat."
"commodo consequat.\n"
]
.join("\n")
);
Ok(())
}

10
src/main.rs
View file

@ -1,15 +1,9 @@
use clap::Parser;
use skip::{skip, Cli, Result};
use std::io::Write;
fn main() -> Result<()> {
let cli = Cli::parse();
let mut stdout = std::io::stdout();
let stdout = std::io::stdout();
let mut output = stdout.lock();
skip(&cli, |line| match writeln!(output, "{}", line) {
Err(_) => (),
Ok(_) => (),
})
skip(&cli, &mut stdout)
}