1 files changed, 131 insertions, 0 deletions
diff --git a/vendor/indoc/src/unindent.rs b/vendor/indoc/src/unindent.rs
new file mode 100644
index 000000000..11d19d222
--- /dev/null
+++ b/vendor/indoc/src/unindent.rs
@@ -0,0 +1,131 @@
+use std::iter::Peekable;
+use std::slice::Split;
+
+pub fn unindent(s: &str) -> String {
+    let bytes = s.as_bytes();
+    let unindented = unindent_bytes(bytes);
+    String::from_utf8(unindented).unwrap()
+}
+
+// Compute the maximal number of spaces that can be removed from every line, and
+// remove them.
+pub fn unindent_bytes(s: &[u8]) -> Vec<u8> {
+    // Document may start either on the same line as opening quote or
+    // on the next line
+    let ignore_first_line = s.starts_with(b"\n") || s.starts_with(b"\r\n");
+
+    // Largest number of spaces that can be removed from every
+    // non-whitespace-only line after the first
+    let spaces = s
+        .lines()
+        .skip(1)
+        .filter_map(count_spaces)
+        .min()
+        .unwrap_or(0);
+
+    let mut result = Vec::with_capacity(s.len());
+    for (i, line) in s.lines().enumerate() {
+        if i > 1 || (i == 1 && !ignore_first_line) {
+            result.push(b'\n');
+        }
+        if i == 0 {
+            // Do not un-indent anything on same line as opening quote
+            result.extend_from_slice(line);
+        } else if line.len() > spaces {
+            // Whitespace-only lines may have fewer than the number of spaces
+            // being removed
+            result.extend_from_slice(&line[spaces..]);
+        }
+    }
+    result
+}
+
+pub trait Unindent {
+    type Output;
+
+    fn unindent(&self) -> Self::Output;
+}
+
+impl Unindent for str {
+    type Output = String;
+
+    fn unindent(&self) -> Self::Output {
+        unindent(self)
+    }
+}
+
+impl Unindent for String {
+    type Output = String;
+
+    fn unindent(&self) -> Self::Output {
+        unindent(self)
+    }
+}
+
+impl Unindent for [u8] {
+    type Output = Vec<u8>;
+
+    fn unindent(&self) -> Self::Output {
+        unindent_bytes(self)
+    }
+}
+
+impl<'a, T: ?Sized + Unindent> Unindent for &'a T {
+    type Output = T::Output;
+
+    fn unindent(&self) -> Self::Output {
+        (**self).unindent()
+    }
+}
+
+// Number of leading spaces in the line, or None if the line is entirely spaces.
+fn count_spaces(line: &[u8]) -> Option<usize> {
+    for (i, ch) in line.iter().enumerate() {
+        if *ch != b' ' && *ch != b'\t' {
+            return Some(i);
+        }
+    }
+    None
+}
+
+// Based on core::str::StrExt.
+trait BytesExt {
+    fn lines(&self) -> Lines;
+}
+
+impl BytesExt for [u8] {
+    fn lines(&self) -> Lines {
+        fn is_newline(b: &u8) -> bool {
+            *b == b'\n'
+        }
+        let bytestring = if self.starts_with(b"\r\n") {
+            &self[1..]
+        } else {
+            self
+        };
+        Lines {
+            split: bytestring.split(is_newline as fn(&u8) -> bool).peekable(),
+        }
+    }
+}
+
+struct Lines<'a> {
+    split: Peekable<Split<'a, u8, fn(&u8) -> bool>>,
+}
+
+impl<'a> Iterator for Lines<'a> {
+    type Item = &'a [u8];
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match self.split.next() {
+            None => None,
+            Some(fragment) => {
+                if fragment.is_empty() && self.split.peek().is_none() {
+                    None
+                } else {
+                    Some(fragment)
+                }
+            }
+        }
+    }
+}