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use {
super::{subprocess::SubprocCommand, types::Die},
aho_corasick::{AhoCorasick, AhoCorasickBuilder},
clap::Parser,
regex::{Regex, RegexBuilder},
shlex::split,
std::{
collections::HashMap,
env::{args_os, current_dir, var_os},
ffi::OsString,
io::{stderr, stdout, IsTerminal},
path::PathBuf,
},
which::which,
};
#[derive(Debug)]
pub enum Mode {
Initial,
Preview(PathBuf),
Patch(PathBuf),
}
impl Mode {
pub const ARGV: &'static str = env!("SAD_ARGV_UUID");
pub const PREVIEW: &'static str = env!("SAD_PREVIEW_UUID");
pub const PATCH: &'static str = env!("SAD_PATCH_UUID");
}
#[derive(Debug, Parser)]
#[clap(about, version)]
pub struct Arguments {
/// Search pattern
#[clap()]
pub pattern: String,
/// Replacement pattern, empty = delete
#[clap()]
pub replace: Option<String>,
/// Use \0 as stdin delimiter
#[clap(short = '0', long)]
pub read0: bool,
/// No preview, write changes to file
#[clap(short = 'k', long)]
pub commit: bool,
/// String literal mode
#[clap(short, long)]
pub exact: bool,
/// Regex flags: use `--help` instead of `-h` to see details
///
/// [lowercase on, uppercase off] ie i => on, I => off
///
/// i :: ignore case (works for --exact)
///
/// m :: multiline '^', '$'
///
/// s :: '.' match newlines
///
/// u :: swap the meaning of '*' and '*?' (lazy & greedy matching)
///
/// x :: ignore whitespaces and '#' comments
#[clap(short, long)]
pub flags: Option<String>,
/// Colourizing program, disable = never, default = $GIT_PAGER
///
/// Uses bash shell syntax for splitting
#[clap(short, long)]
pub pager: Option<String>,
/// Additional Fzf options, disable = never
///
/// Uses bash shell syntax for splitting
#[clap(long)]
pub fzf: Option<String>,
/// Same as in GNU diff --unified={size}, affects aggregate size
///
/// ie. a higher {size} will leader to more changes grouped together
#[clap(short, long)]
pub unified: Option<usize>,
}
fn parse_fzf_mode(argv: &OsString) -> Option<Mode> {
let exec = argv
.to_str()
.unwrap_or_default()
.split('\x04')
.collect::<Vec<_>>();
match exec[..] {
[Mode::PREVIEW, path] => Some(Mode::Preview(PathBuf::from(path))),
[Mode::PATCH, path] => Some(Mode::Patch(PathBuf::from(path))),
_ => None,
}
}
pub fn parse_args() -> (Mode, Arguments) {
let args = args_os().collect::<Vec<_>>();
match (
args.get(1).and_then(|a| a.to_str()),
args.get(2).and_then(parse_fzf_mode),
var_os(Mode::ARGV).and_then(|a| a.into_string().ok()),
) {
(Some("-c"), Some(mode), Some(arg_list)) => {
(mode, Arguments::parse_from(arg_list.split('\x04')))
}
_ => (Mode::Initial, Arguments::parse_from(args)),
}
}
#[derive(Clone, Debug)]
#[allow(clippy::large_enum_variant)]
pub enum Engine {
AhoCorasick(AhoCorasick, String),
Regex(Regex, String),
}
#[derive(Clone, Debug)]
pub enum Action {
Preview,
Commit,
FzfPreview(PathBuf, Vec<String>),
}
#[derive(Clone, Debug)]
pub enum Printer {
Stdout,
Pager(SubprocCommand),
}
#[derive(Clone, Debug)]
pub struct Options {
pub cwd: Option<PathBuf>,
pub action: Action,
pub engine: Engine,
pub printer: Printer,
pub unified: usize,
}
fn p_auto_flags(exact: bool, pattern: &str) -> Vec<String> {
let mut flags = vec!["i".to_owned()];
if !exact {
flags.push("m".to_owned());
}
for c in pattern.chars() {
if c.is_uppercase() {
flags.push("I".to_owned());
break;
}
}
flags
}
fn p_aho_corasick(pattern: &str, flags: Vec<String>) -> Result<AhoCorasick, Die> {
let mut ac = AhoCorasickBuilder::new();
for flag in flags {
match flag.as_str() {
"i" => ac.ascii_case_insensitive(true),
"I" => ac.ascii_case_insensitive(false),
_ => {
return Err(Die::ArgumentError(format!(
"Invalid regex flag, see `--help` :: {flag}"
)))
}
};
}
Ok(ac.build([pattern])?)
}
fn p_regex(pattern: &str, flags: Vec<String>) -> Result<Regex, Die> {
let mut re = RegexBuilder::new(pattern);
for flag in flags {
match flag.as_str() {
"i" => re.case_insensitive(true),
"I" => re.case_insensitive(false),
"m" => re.multi_line(true),
"M" => re.multi_line(false),
"s" => re.dot_matches_new_line(true),
"S" => re.dot_matches_new_line(false),
"u" => re.swap_greed(true),
"U" => re.swap_greed(false),
"x" => re.ignore_whitespace(true),
"X" => re.ignore_whitespace(false),
_ => {
return Err(Die::ArgumentError(format!(
"Invalid regex flag, see `--help` :: {flag}"
)))
}
};
}
Ok(re.build()?)
}
fn p_fzf(fzf: &Option<String>) -> Option<(PathBuf, Vec<String>)> {
match (which("fzf"), stdout().is_terminal(), stderr().is_terminal()) {
(Ok(p), true, true) => match fzf.as_deref() {
Some("never") => None,
Some(val) => Some((p, split(val).unwrap_or_default())),
None => Some((p, Vec::default())),
},
_ => None,
}
}
fn p_pager(pager: &Option<String>) -> Option<SubprocCommand> {
let norm = || which("delta").or_else(|_| which("diff-so-fancy")).ok();
let (prog, arguments) = match pager.as_deref() {
Some("never") => (None, Vec::default()),
Some(val) => {
let mut sh = split(val)
.unwrap_or_else(|| vec![val.to_owned()])
.into_iter();
(
sh.next().and_then(|p| which(p).ok()).or_else(norm),
sh.collect(),
)
}
None => {
let val = var_os("GIT_PAGER")
.and_then(|v| v.into_string().ok())
.unwrap_or_default();
let less_less = val.split('|').next().unwrap_or(&val).trim();
let mut sh = split(less_less)
.unwrap_or_else(|| vec![less_less.to_owned()])
.into_iter();
(
sh.next().and_then(|p| which(p).ok()).or_else(norm),
sh.collect(),
)
}
};
prog.map(|program| SubprocCommand {
args: arguments,
prog: program,
env: HashMap::new(),
})
}
pub fn parse_opts(mode: Mode, args: Arguments) -> Result<Options, Die> {
let mut flagset = p_auto_flags(args.exact, &args.pattern);
flagset.extend(
args
.flags
.unwrap_or_default()
.split_terminator("")
.skip(1)
.map(String::from),
);
let engine = {
let replace = args.replace.unwrap_or_default();
if args.exact {
Engine::AhoCorasick(p_aho_corasick(&args.pattern, flagset)?, replace)
} else {
Engine::Regex(p_regex(&args.pattern, flagset)?, replace)
}
};
let action = match (args.commit, mode, p_fzf(&args.fzf)) {
(true, _, _) | (_, Mode::Patch(_), _) => Action::Commit,
(
|