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-rw-r--r--helix-core/src/shellwords.rs84
1 files changed, 74 insertions, 10 deletions
diff --git a/helix-core/src/shellwords.rs b/helix-core/src/shellwords.rs
index e8c5945b..3375bef1 100644
--- a/helix-core/src/shellwords.rs
+++ b/helix-core/src/shellwords.rs
@@ -17,18 +17,18 @@ pub fn escape(input: &str) -> Cow<'_, str> {
}
}
+enum State {
+ OnWhitespace,
+ Unquoted,
+ UnquotedEscaped,
+ Quoted,
+ QuoteEscaped,
+ Dquoted,
+ DquoteEscaped,
+}
+
/// Get the vec of escaped / quoted / doublequoted filenames from the input str
pub fn shellwords(input: &str) -> Vec<Cow<'_, str>> {
- enum State {
- OnWhitespace,
- Unquoted,
- UnquotedEscaped,
- Quoted,
- QuoteEscaped,
- Dquoted,
- DquoteEscaped,
- }
-
use State::*;
let mut state = Unquoted;
@@ -140,6 +140,70 @@ pub fn shellwords(input: &str) -> Vec<Cow<'_, str>> {
args
}
+/// Checks that the input ends with an ascii whitespace character which is
+/// not escaped.
+///
+/// # Examples
+///
+/// ```rust
+/// use helix_core::shellwords::ends_with_whitespace;
+/// assert_eq!(ends_with_whitespace(" "), true);
+/// assert_eq!(ends_with_whitespace(":open "), true);
+/// assert_eq!(ends_with_whitespace(":open foo.txt "), true);
+/// assert_eq!(ends_with_whitespace(":open"), false);
+/// #[cfg(unix)]
+/// assert_eq!(ends_with_whitespace(":open a\\ "), false);
+/// #[cfg(unix)]
+/// assert_eq!(ends_with_whitespace(":open a\\ b.txt"), false);
+/// ```
+pub fn ends_with_whitespace(input: &str) -> bool {
+ use State::*;
+
+ // Fast-lane: the input must end with a whitespace character
+ // regardless of quoting.
+ if !input.ends_with(|c: char| c.is_ascii_whitespace()) {
+ return false;
+ }
+
+ let mut state = Unquoted;
+
+ for c in input.chars() {
+ state = match state {
+ OnWhitespace => match c {
+ '"' => Dquoted,
+ '\'' => Quoted,
+ '\\' if cfg!(unix) => UnquotedEscaped,
+ '\\' => OnWhitespace,
+ c if c.is_ascii_whitespace() => OnWhitespace,
+ _ => Unquoted,
+ },
+ Unquoted => match c {
+ '\\' if cfg!(unix) => UnquotedEscaped,
+ '\\' => Unquoted,
+ c if c.is_ascii_whitespace() => OnWhitespace,
+ _ => Unquoted,
+ },
+ UnquotedEscaped => Unquoted,
+ Quoted => match c {
+ '\\' if cfg!(unix) => QuoteEscaped,
+ '\\' => Quoted,
+ '\'' => OnWhitespace,
+ _ => Quoted,
+ },
+ QuoteEscaped => Quoted,
+ Dquoted => match c {
+ '\\' if cfg!(unix) => DquoteEscaped,
+ '\\' => Dquoted,
+ '"' => OnWhitespace,
+ _ => Dquoted,
+ },
+ DquoteEscaped => Dquoted,
+ }
+ }
+
+ matches!(state, OnWhitespace)
+}
+
#[cfg(test)]
mod test {
use super::*;