X-Git-Url: http://git.scottworley.com/tablify/blobdiff_plain/5a070b309feffc87f170365411c5e71626f72520..e44de444711dd8dc9d79f4fd6ab86c2d0fd26862:/src/lib.rs?ds=inline diff --git a/src/lib.rs b/src/lib.rs index 5c994c9..b52806a 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -4,8 +4,19 @@ use std::fmt::Write; use std::io::BufRead; use std::iter::Iterator; -pub struct Config { - pub column_threshold: usize, +#[derive(PartialEq, Eq, Debug)] +struct Config { + column_threshold: usize, +} +impl Config { + fn apply_command(&mut self, cmd: &str) -> Result<(), std::io::Error> { + if let Some(threshold) = cmd.strip_prefix("col_threshold ") { + self.column_threshold = threshold + .parse() + .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidInput, e))?; + } + Ok(()) + } } const HEADER: &str = r#" @@ -87,12 +98,15 @@ enum InputLine<'a> { Blank, RowHeader(&'a str), Entry(&'a str, Option<&'a str>), + Command(&'a str), } impl<'a> From<&'a str> for InputLine<'a> { fn from(value: &'a str) -> InputLine<'a> { let trimmed = value.trim_end(); if trimmed.is_empty() { InputLine::Blank + } else if let Some(cmd) = trimmed.strip_prefix('!') { + InputLine::Command(cmd) } else if !trimmed.starts_with(' ') { InputLine::RowHeader(value.trim()) } else { @@ -116,19 +130,23 @@ enum Rowlike { Spacer, } -struct Reader>> { +struct Reader<'cfg, Input: Iterator>> { input: std::iter::Enumerate, row: Option, + config: &'cfg mut Config, } -impl>> Reader { - fn new(input: Input) -> Self { +impl<'cfg, Input: Iterator>> Reader<'cfg, Input> { + fn new(config: &'cfg mut Config, input: Input) -> Self { Self { input: input.enumerate(), row: None, + config, } } } -impl>> Iterator for Reader { +impl<'cfg, Input: Iterator>> Iterator + for Reader<'cfg, Input> +{ type Item = Result; fn next(&mut self) -> Option { loop { @@ -136,6 +154,11 @@ impl>> Iterator for Reader None => return Ok(std::mem::take(&mut self.row).map(Rowlike::Row)).transpose(), Some((_, Err(e))) => return Some(Err(e)), Some((n, Ok(line))) => match InputLine::from(line.as_ref()) { + InputLine::Command(cmd) => { + if let Err(e) = self.config.apply_command(cmd) { + return Some(Err(e)); + } + } InputLine::Blank if self.row.is_some() => { return Ok(std::mem::take(&mut self.row).map(Rowlike::Row)).transpose() } @@ -171,12 +194,13 @@ impl>> Iterator for Reader } fn read_input(input: impl std::io::Read) -> Result<(Vec, Config), std::io::Error> { - let default_config = Config { + let mut config = Config { column_threshold: 2, }; - Reader::new(std::io::BufReader::new(input).lines()) + let reader = Reader::new(&mut config, std::io::BufReader::new(input).lines()); + reader .collect::, _>>() - .map(|rows| (rows, default_config)) + .map(|rows| (rows, config)) } fn column_counts(rows: &[Rowlike]) -> Vec<(usize, String)> { @@ -356,6 +380,9 @@ mod tests { fn read_rows(input: impl std::io::Read) -> Result, std::io::Error> { read_input(input).map(|(rows, _)| rows) } + fn read_config(input: impl std::io::Read) -> Result { + read_input(input).map(|(_, config)| config) + } #[test] fn test_read_rows() { assert_eq!( @@ -459,6 +486,20 @@ mod tests { assert!(format!("{bad2:?}").contains("3: Entry with no header")); } + #[test] + fn test_read_config() { + assert_eq!( + read_config(&b"!col_threshold 10"[..]).unwrap(), + Config { + column_threshold: 10 + } + ); + + let bad_num = read_config(&b"!col_threshold foo"[..]); + assert!(bad_num.is_err()); + assert!(format!("{bad_num:?}").contains("Parse")); + } + #[test] fn test_column_counts() { assert_eq!(