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Copy pathparams.rs
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Copy pathparams.rs
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1320 lines (1287 loc) · 41 KB
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use std::ffi::{OsStr, OsString};
use std::iter::Peekable;
use std::path::{Path, PathBuf};
use regex::Regex;
use crate::bre::Bre;
use crate::color::ColorWhen;
use crate::utils::fold_file_name_case;
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
pub enum Format {
#[default]
Normal,
Unified,
Context,
Ed,
SideBySide,
}
/// How to handle an operand that does not exist (`-N` and
/// `--unidirectional-new-file`).
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
pub enum MissingFile {
/// A missing operand is an error.
#[default]
Error,
/// A missing operand is treated as an empty file.
Empty,
/// Only a missing first operand is treated as an empty file.
EmptyIfFirst,
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct Params {
pub executable: OsString,
pub from: OsString,
pub to: OsString,
pub format: Format,
pub context_count: usize,
pub report_identical_files: bool,
pub brief: bool,
pub expand_tabs: bool,
pub tabsize: usize,
pub width: usize,
pub missing_file: MissingFile,
pub text: bool,
pub color: ColorWhen,
/// The raw `--palette` value, validated when colors are enabled.
pub palette: Option<String>,
pub presume_output_tty: bool,
/// Basic regular expressions matching the lines shown after hunk
/// headers (`-F` and `-p`).
pub function_line_patterns: Vec<Bre>,
pub recursive: bool,
/// The name from which to start comparing the top-level directories
/// (`-S`).
pub starting_file: Option<OsString>,
pub ignore_file_name_case: bool,
}
/// The pattern of `-p`, matching the first line of C functions.
const C_FUNCTION_PATTERN: &str = "^[[:alpha:]$_]";
impl Default for Params {
fn default() -> Self {
Self {
executable: OsString::default(),
from: OsString::default(),
to: OsString::default(),
format: Format::default(),
context_count: 3,
report_identical_files: false,
brief: false,
expand_tabs: false,
tabsize: 8,
width: 130,
missing_file: MissingFile::default(),
text: false,
color: ColorWhen::default(),
palette: None,
presume_output_tty: false,
function_line_patterns: Vec::new(),
recursive: false,
starting_file: None,
ignore_file_name_case: false,
}
}
}
/// Parses the command line, and also returns its arguments other than the
/// program name and the operands.
pub fn parse_params<I: Iterator<Item = OsString>>(
opts: Peekable<I>,
) -> Result<(Params, Vec<OsString>), String> {
let args: Vec<OsString> = opts.collect();
// Each argument comes with its position, to tell the operands apart from
// an option argument with the same value.
let mut opts = args.iter().cloned().enumerate().peekable();
let mut operand_positions = Vec::new();
let Some((_, executable)) = opts.next() else {
return Err("Usage: <exe> <from> <to>".to_string());
};
let mut params = Params {
executable,
..Default::default()
};
let mut from = None;
let mut to = None;
let mut format = None;
let mut context = None;
let mut show_c_function = false;
let tabsize_re = Regex::new(r"^--tabsize=(?<num>\d+)$").unwrap();
let width_re = Regex::new(r"^--width=(?P<long>\d+)$").unwrap();
while let Some((position, param)) = opts.next() {
let next_param = opts.peek().map(|(_, next_param)| next_param);
if param == "--" {
break;
}
if param == "-" {
operand_positions.push(position);
if from.is_none() {
from = Some(param);
} else if to.is_none() {
to = Some(param);
} else {
return Err(format!(
"Usage: {} <from> <to>",
params.executable.to_string_lossy()
));
}
continue;
}
if param == "-s" || param == "--report-identical-files" {
params.report_identical_files = true;
continue;
}
if param == "-q" || param == "--brief" {
params.brief = true;
continue;
}
if param == "-N" || param == "--new-file" {
params.missing_file = MissingFile::Empty;
continue;
}
if param == "--unidirectional-new-file" {
if params.missing_file != MissingFile::Empty {
params.missing_file = MissingFile::EmptyIfFirst;
}
continue;
}
if param == "--color" {
params.color = ColorWhen::Auto;
continue;
}
if let Some(when) = param.to_str().and_then(|p| p.strip_prefix("--color=")) {
params.color = match when {
"auto" => ColorWhen::Auto,
"always" => ColorWhen::Always,
"never" => ColorWhen::Never,
_ => return Err(format!("invalid color '{when}'")),
};
continue;
}
if param == "--palette" {
let Some((_, palette)) = opts.next() else {
return Err("option '--palette' requires an argument".to_string());
};
params.palette = Some(palette.to_string_lossy().into_owned());
continue;
}
if let Some(palette) = param.to_str().and_then(|p| p.strip_prefix("--palette=")) {
params.palette = Some(palette.to_string());
continue;
}
if param == "---presume-output-tty" {
params.presume_output_tty = true;
continue;
}
if param == "-p" || param == "--show-c-function" {
show_c_function = true;
push_function_line_pattern(&mut params, C_FUNCTION_PATTERN)?;
continue;
}
if let Some(argument) = option_argument(¶m, "-F", "--show-function-line") {
let pattern = argument_value(argument, ¶m, &mut opts)?;
push_function_line_pattern(&mut params, &pattern.to_string_lossy())?;
continue;
}
if param == "--ignore-file-name-case" {
params.ignore_file_name_case = true;
continue;
}
if param == "--no-ignore-file-name-case" {
params.ignore_file_name_case = false;
continue;
}
if let Some(argument) = option_argument(¶m, "-S", "--starting-file") {
params.starting_file = Some(argument_value(argument, ¶m, &mut opts)?);
continue;
}
if param == "-r" || param == "--recursive" {
params.recursive = true;
continue;
}
if param == "-a" || param == "--text" {
params.text = true;
continue;
}
if param == "-t" || param == "--expand-tabs" {
params.expand_tabs = true;
continue;
}
if param == "--normal" {
if format.is_some() && format != Some(Format::Normal) {
return Err("Conflicting output style options".to_string());
}
format = Some(Format::Normal);
continue;
}
if param == "-e" || param == "--ed" {
if format.is_some() && format != Some(Format::Ed) {
return Err("Conflicting output style options".to_string());
}
format = Some(Format::Ed);
continue;
}
if param == "-y" || param == "--side-by-side" {
if format.is_some() && format != Some(Format::SideBySide) {
return Err("Conflicting output style option".to_string());
}
format = Some(Format::SideBySide);
continue;
}
if width_re.is_match(param.to_string_lossy().as_ref()) {
let param = param.into_string().unwrap();
let width_str: &str = width_re
.captures(param.as_str())
.unwrap()
.name("long")
.unwrap()
.as_str();
params.width = match width_str.parse::<usize>() {
Ok(num) => {
if num == 0 {
return Err("invalid width «0»".to_string());
}
num
}
Err(_) => return Err(format!("invalid width «{width_str}»")),
};
continue;
}
if tabsize_re.is_match(param.to_string_lossy().as_ref()) {
// Because param matches the regular expression,
// it is safe to assume it is valid UTF-8.
let param = param.into_string().unwrap();
let tabsize_str = tabsize_re
.captures(param.as_str())
.unwrap()
.name("num")
.unwrap()
.as_str();
params.tabsize = match tabsize_str.parse::<usize>() {
Ok(num) => {
if num == 0 {
return Err("invalid tabsize «0»".to_string());
}
num
}
Err(_) => return Err(format!("invalid tabsize «{tabsize_str}»")),
};
continue;
}
match match_context_diff_params(¶m, next_param, format) {
Ok(DiffStyleMatch {
is_match,
context_count,
next_param_consumed,
}) => {
if is_match {
format = Some(Format::Context);
if context_count.is_some() {
context = context_count;
}
if next_param_consumed {
opts.next();
}
continue;
}
}
Err(error) => return Err(error),
}
match match_unified_diff_params(¶m, next_param, format) {
Ok(DiffStyleMatch {
is_match,
context_count,
next_param_consumed,
}) => {
if is_match {
format = Some(Format::Unified);
if context_count.is_some() {
context = context_count;
}
if next_param_consumed {
opts.next();
}
continue;
}
}
Err(error) => return Err(error),
}
if param.to_string_lossy().starts_with('-') {
return Err(format!("unrecognized option '{}'", param.to_string_lossy()));
}
operand_positions.push(position);
if from.is_none() {
from = Some(param);
} else if to.is_none() {
to = Some(param);
} else {
return Err(format!(
"Usage: {} <from> <to>",
params.executable.to_string_lossy()
));
}
}
params.from = if let Some(from) = from {
from
} else if let Some((position, param)) = opts.next() {
operand_positions.push(position);
param
} else {
return Err(format!(
"Usage: {} <from> <to>",
params.executable.to_string_lossy()
));
};
params.to = if let Some(to) = to {
to
} else if let Some((position, param)) = opts.next() {
operand_positions.push(position);
param
} else {
return Err(format!(
"Usage: {} <from> <to>",
params.executable.to_string_lossy()
));
};
// diff DIRECTORY FILE => diff DIRECTORY/FILE FILE
// diff FILE DIRECTORY => diff FILE DIRECTORY/FILE
let mut from_path: PathBuf = PathBuf::from(¶ms.from);
let mut to_path: PathBuf = PathBuf::from(¶ms.to);
if from_path.is_dir() && to_path.is_file() {
let name = directory_entry(&from_path, to_path.file_name().unwrap(), ¶ms);
from_path.push(name);
params.from = from_path.into_os_string();
} else if from_path.is_file() && to_path.is_dir() {
let name = directory_entry(&to_path, from_path.file_name().unwrap(), ¶ms);
to_path.push(name);
params.to = to_path.into_os_string();
}
params.format = match format {
Some(format) => format,
None if show_c_function => Format::Context,
None => Format::default(),
};
if let Some(context_count) = context {
params.context_count = context_count;
}
let options = args
.into_iter()
.enumerate()
.skip(1)
.filter(|(position, _)| !operand_positions.contains(position))
.map(|(_, arg)| arg)
.collect();
Ok((params, options))
}
/// Returns the name of the entry of `dir` to compare with a file named
/// `name`: `name` itself, or with --ignore-file-name-case, an entry whose name
/// differs only by case when `name` does not exist.
fn directory_entry(dir: &Path, name: &OsStr, params: &Params) -> OsString {
if params.ignore_file_name_case && !dir.join(name).exists() {
let wanted = fold_file_name_case(name);
let entries = std::fs::read_dir(dir).into_iter().flatten().flatten();
if let Some(entry) = entries
.map(|entry| entry.file_name())
.find(|entry| fold_file_name_case(entry) == wanted)
{
return entry;
}
}
name.to_os_string()
}
/// How the argument of an option is given.
enum OptionArgument<'a> {
/// In the same command line argument, as in `-Fx` or `--show-function-line=x`.
Attached(&'a str),
/// As the next command line argument.
Separate,
}
/// Returns how the argument of the option named `short` (like `-F`) or
/// `long` is given, if `param` is that option.
fn option_argument<'a>(param: &'a OsStr, short: &str, long: &str) -> Option<OptionArgument<'a>> {
if param == short || param == long {
return Some(OptionArgument::Separate);
}
let param = param.to_str()?;
param
.strip_prefix(long)
.and_then(|rest| rest.strip_prefix('='))
.or_else(|| param.strip_prefix(short).filter(|value| !value.is_empty()))
.map(OptionArgument::Attached)
}
/// Returns the value of the argument of the option `param`, taking the next
/// command line argument when it is not attached.
fn argument_value(
argument: OptionArgument,
param: &OsStr,
opts: &mut impl Iterator<Item = (usize, OsString)>,
) -> Result<OsString, String> {
match argument {
OptionArgument::Attached(value) => Ok(value.into()),
OptionArgument::Separate => opts
.next()
.map(|(_, value)| value)
.ok_or_else(|| format!("option '{}' requires an argument", param.to_string_lossy())),
}
}
/// Validates and records a `-F` pattern.
fn push_function_line_pattern(params: &mut Params, pattern: &str) -> Result<(), String> {
let bre = Bre::new(pattern).map_err(|error| format!("'{pattern}': {error}"))?;
params.function_line_patterns.push(bre);
Ok(())
}
struct DiffStyleMatch {
is_match: bool,
context_count: Option<usize>,
next_param_consumed: bool,
}
fn match_context_diff_params(
param: &OsString,
next_param: Option<&OsString>,
format: Option<Format>,
) -> Result<DiffStyleMatch, String> {
const CONTEXT_RE: &str = r"^(-[cC](?<num1>\d*)|--context(=(?<num2>\d*))?|-(?<num3>\d+)c)$";
let regex = Regex::new(CONTEXT_RE).unwrap();
let is_match = regex.is_match(param.to_string_lossy().as_ref());
let mut context_count = None;
let mut next_param_consumed = false;
if is_match {
if format.is_some() && format != Some(Format::Context) {
return Err("Conflicting output style options".to_string());
}
let captures = regex.captures(param.to_str().unwrap()).unwrap();
let num = captures
.name("num1")
.or(captures.name("num2"))
.or(captures.name("num3"));
if let Some(numvalue) = num {
if !numvalue.as_str().is_empty() {
context_count = Some(numvalue.as_str().parse::<usize>().unwrap());
}
}
if param == "-C" {
if let Some(p) = next_param {
let size_str = p.to_string_lossy();
match size_str.parse::<usize>() {
Ok(context_size) => {
context_count = Some(context_size);
next_param_consumed = true;
}
Err(_) => return Err(format!("invalid context length '{size_str}'")),
}
}
}
}
Ok(DiffStyleMatch {
is_match,
context_count,
next_param_consumed,
})
}
fn match_unified_diff_params(
param: &OsString,
next_param: Option<&OsString>,
format: Option<Format>,
) -> Result<DiffStyleMatch, String> {
const UNIFIED_RE: &str = r"^(-[uU](?<num1>\d*)|--unified(=(?<num2>\d*))?|-(?<num3>\d+)u)$";
let regex = Regex::new(UNIFIED_RE).unwrap();
let is_match = regex.is_match(param.to_string_lossy().as_ref());
let mut context_count = None;
let mut next_param_consumed = false;
if is_match {
if format.is_some() && format != Some(Format::Unified) {
return Err("Conflicting output style options".to_string());
}
let captures = regex.captures(param.to_str().unwrap()).unwrap();
let num = captures
.name("num1")
.or(captures.name("num2"))
.or(captures.name("num3"));
if let Some(numvalue) = num {
if !numvalue.as_str().is_empty() {
context_count = Some(numvalue.as_str().parse::<usize>().unwrap());
}
}
if param == "-U" {
if let Some(p) = next_param {
let size_str = p.to_string_lossy();
match size_str.parse::<usize>() {
Ok(context_size) => {
context_count = Some(context_size);
next_param_consumed = true;
}
Err(_) => return Err(format!("invalid context length '{size_str}'")),
}
}
}
}
Ok(DiffStyleMatch {
is_match,
context_count,
next_param_consumed,
})
}
#[cfg(test)]
mod tests {
use super::*;
fn parse_params<I: Iterator<Item = OsString>>(opts: Peekable<I>) -> Result<Params, String> {
super::parse_params(opts).map(|(params, _)| params)
}
fn os(s: &str) -> OsString {
OsString::from(s)
}
#[test]
fn basics() {
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
..Default::default()
}),
parse_params(
[os("diff"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
..Default::default()
}),
parse_params(
[os("diff"), os("--normal"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
}
#[test]
fn basics_ed() {
for arg in ["-e", "--ed"] {
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
format: Format::Ed,
..Default::default()
}),
parse_params(
[os("diff"), os(arg), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
}
}
#[test]
fn context_valid() {
for args in [vec!["-c"], vec!["--context"], vec!["--context="]] {
let mut params = vec!["diff"];
params.extend(args);
params.extend(["foo", "bar"]);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
format: Format::Context,
..Default::default()
}),
parse_params(params.iter().map(|x| os(x)).peekable())
);
}
for args in [
vec!["-c42"],
vec!["-C42"],
vec!["-C", "42"],
vec!["--context=42"],
vec!["-42c"],
] {
let mut params = vec!["diff"];
params.extend(args);
params.extend(["foo", "bar"]);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
format: Format::Context,
context_count: 42,
..Default::default()
}),
parse_params(params.iter().map(|x| os(x)).peekable())
);
}
}
#[test]
fn context_invalid() {
for args in [
vec!["-c", "42"],
vec!["-c=42"],
vec!["-c="],
vec!["-C"],
vec!["-C=42"],
vec!["-C="],
vec!["--context42"],
vec!["--context", "42"],
vec!["-42C"],
] {
let mut params = vec!["diff"];
params.extend(args);
params.extend(["foo", "bar"]);
assert!(parse_params(params.iter().map(|x| os(x)).peekable()).is_err());
}
}
#[test]
fn unified_valid() {
for args in [vec!["-u"], vec!["--unified"], vec!["--unified="]] {
let mut params = vec!["diff"];
params.extend(args);
params.extend(["foo", "bar"]);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
format: Format::Unified,
..Default::default()
}),
parse_params(params.iter().map(|x| os(x)).peekable())
);
}
for args in [
vec!["-u42"],
vec!["-U42"],
vec!["-U", "42"],
vec!["--unified=42"],
vec!["-42u"],
] {
let mut params = vec!["diff"];
params.extend(args);
params.extend(["foo", "bar"]);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
format: Format::Unified,
context_count: 42,
..Default::default()
}),
parse_params(params.iter().map(|x| os(x)).peekable())
);
}
}
#[test]
fn unified_invalid() {
for args in [
vec!["-u", "42"],
vec!["-u=42"],
vec!["-u="],
vec!["-U"],
vec!["-U=42"],
vec!["-U="],
vec!["--unified42"],
vec!["--unified", "42"],
vec!["-42U"],
] {
let mut params = vec!["diff"];
params.extend(args);
params.extend(["foo", "bar"]);
assert!(parse_params(params.iter().map(|x| os(x)).peekable()).is_err());
}
}
#[test]
fn context_count() {
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
format: Format::Unified,
context_count: 54,
..Default::default()
}),
parse_params(
[os("diff"), os("-u54"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
format: Format::Unified,
context_count: 54,
..Default::default()
}),
parse_params(
[os("diff"), os("-U54"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
format: Format::Unified,
context_count: 54,
..Default::default()
}),
parse_params(
[os("diff"), os("-U"), os("54"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
format: Format::Context,
context_count: 54,
..Default::default()
}),
parse_params(
[os("diff"), os("-c54"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
}
#[test]
fn report_identical_files() {
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
..Default::default()
}),
parse_params(
[os("diff"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
report_identical_files: true,
..Default::default()
}),
parse_params(
[os("diff"), os("-s"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
report_identical_files: true,
..Default::default()
}),
parse_params(
[
os("diff"),
os("--report-identical-files"),
os("foo"),
os("bar"),
]
.iter()
.cloned()
.peekable()
)
);
}
#[test]
fn brief() {
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
..Default::default()
}),
parse_params(
[os("diff"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
brief: true,
..Default::default()
}),
parse_params(
[os("diff"), os("-q"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
brief: true,
..Default::default()
}),
parse_params(
[os("diff"), os("--brief"), os("foo"), os("bar"),]
.iter()
.cloned()
.peekable()
)
);
}
#[test]
fn text() {
for option in ["-a", "--text"] {
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("old.bin"),
to: os("new.bin"),
text: true,
..Default::default()
}),
parse_params(
[os("diff"), os(option), os("old.bin"), os("new.bin")]
.iter()
.cloned()
.peekable()
)
);
}
}
#[test]
fn expand_tabs() {
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
..Default::default()
}),
parse_params(
[os("diff"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
for option in ["-t", "--expand-tabs"] {
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
expand_tabs: true,
..Default::default()
}),
parse_params(
[os("diff"), os(option), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
}
}
#[test]
fn tabsize() {
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
..Default::default()
}),
parse_params(
[os("diff"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
tabsize: 1,
..Default::default()
}),
parse_params(
[os("diff"), os("--tabsize=1"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert_eq!(
Ok(Params {
executable: os("diff"),
from: os("foo"),
to: os("bar"),
tabsize: 42,
..Default::default()
}),
parse_params(
[os("diff"), os("--tabsize=42"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
);
assert!(parse_params(
[os("diff"), os("--tabsize"), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()
)
.is_err());
assert!(parse_params(
[os("diff"), os("--tabsize="), os("foo"), os("bar")]
.iter()
.cloned()
.peekable()