Replace trim_{left,right} with trim_{start,end} and co. (using Rerast)

src/fmt/parasplit.rs

@@ -520,7 +520,7 @@ impl<'a> WordSplit<'a> {
 impl<'a> WordSplit<'a> {
     fn new<'b>(opts: &'b FmtOptions, string: &'b str) -> WordSplit<'b> {
         // wordsplits *must* start at a non-whitespace character
-        let trim_string = string.trim_left();
+        let trim_string = string.trim_start();
         WordSplit {
             opts,
             string: trim_string,

src/paste/paste.rs

@@ -94,7 +94,7 @@ fn paste(filenames: Vec<String>, serial: bool, delimiters: String) {
                 match file.read_line(&mut line) {
                     Ok(0) => break,
                     Ok(_) => {
-                        output.push_str(line.trim_right());
+                        output.push_str(line.trim_end());
                         output.push_str(&delimiters[delim_count % delimiters.len()]);
                     }
                     Err(e) => crash!(1, "{}", e.to_string()),
@@ -118,7 +118,7 @@ fn paste(filenames: Vec<String>, serial: bool, delimiters: String) {
                             eof[i] = true;
                             eof_count += 1;
                         }
-                        Ok(_) => output.push_str(line.trim_right()),
+                        Ok(_) => output.push_str(line.trim_end()),
                         Err(e) => crash!(1, "{}", e.to_string()),
                     }
                 }

src/ptx/ptx.rs

@@ -416,7 +416,7 @@ fn format_tex_line(config: &Config, word_ref: &WordRef, line: &str, reference: &
     output.push_str(&format!("\\{} ", config.macro_name));
     let all_before = if config.input_ref {
         let before = &line[0..word_ref.position];
-        adjust_tex_str(before.trim().trim_left_matches(reference))
+        adjust_tex_str(before.trim().trim_start_matches(reference))
     } else {
         adjust_tex_str(&line[0..word_ref.position])
     };
@@ -447,7 +447,7 @@ fn format_roff_line(config: &Config, word_ref: &WordRef, line: &str, reference:
     output.push_str(&format!(".{}", config.macro_name));
     let all_before = if config.input_ref {
         let before = &line[0..word_ref.position];
-        adjust_roff_str(before.trim().trim_left_matches(reference))
+        adjust_roff_str(before.trim().trim_start_matches(reference))
     } else {
         adjust_roff_str(&line[0..word_ref.position])
     };

src/stdbuf/stdbuf.rs

@@ -93,8 +93,8 @@ fn print_usage(opts: &Options) {
 }
 
 fn parse_size(size: &str) -> Option<u64> {
-    let ext = size.trim_left_matches(|c: char| c.is_digit(10));
-    let num = size.trim_right_matches(|c: char| c.is_alphabetic());
+    let ext = size.trim_start_matches(|c: char| c.is_digit(10));
+    let num = size.trim_end_matches(|c: char| c.is_alphabetic());
     let mut recovered = num.to_owned();
     recovered.push_str(ext);
     if recovered != size {

src/tsort/tsort.rs

@@ -79,7 +79,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
         let mut line = String::new();
         match reader.read_line(&mut line) {
             Ok(_) => {
-                let tokens: Vec<String> = line.trim_right()
+                let tokens: Vec<String> = line.trim_end()
                     .split_whitespace()
                     .map(|s| s.to_owned())
                     .collect();

src/uname/uname.rs

@@ -122,7 +122,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
         output.push_str(HOST_OS);
         output.push_str(" ");
     }
-    println!("{}", output.trim_right());
+    println!("{}", output.trim_end());
 
     0
 }

tests/common/util.rs

@@ -110,8 +110,8 @@ impl CmdResult {
     /// stderr_only is a better choice unless stdout may or will be non-empty
     pub fn stderr_is<T: AsRef<str>>(&self, msg: T) -> Box<&CmdResult> {
         assert_eq!(
-            String::from(msg.as_ref()).trim_right(),
-            self.stderr.trim_right()
+            String::from(msg.as_ref()).trim_end(),
+            self.stderr.trim_end()
         );
         Box::new(self)
     }

util/rewrite_rules.rs

@@ -0,0 +1,18 @@
+//! Rules to update the codebase using Rerast
+
+/// Converts try!() to ?
+fn try_to_question_mark<T, E, X: From<E>>(r: Result<T, E>) -> Result<T, X> {
+    replace!(try!(r) => r?);
+    unreachable!()
+}
+
+fn trim_left_to_start(s: &str) {
+    replace!(s.trim_left() => s.trim_start());
+    replace!(s.trim_right() => s.trim_end());
+}
+
+fn trim_left_matches_to_start<P: FnMut(char) -> bool>(s: &str, inner: P) {
+    replace!(s.trim_left_matches(inner) => s.trim_start_matches(inner));
+    replace!(s.trim_right_matches(inner) => s.trim_end_matches(inner));
+}
+