Remove custom 'transpose' function

src/bin/bat/app.rs

@@ -23,7 +23,6 @@ use bat::{
     line_range::{LineRange, LineRanges},
     style::{OutputComponent, OutputComponents, OutputWrap},
     syntax_mapping::SyntaxMapping,
-    util::transpose,
     Config, PagingMode,
 };
 
@@ -198,12 +197,11 @@ impl App {
                 .or_else(|| env::var("BAT_THEME").ok())
                 .unwrap_or_else(|| String::from(BAT_THEME_DEFAULT)),
             line_ranges: LineRanges::from(
-                transpose(
-                    self.matches
-                        .values_of("line-range")
-                        .map(|vs| vs.map(LineRange::from).collect()),
-                )?
-                .unwrap_or_else(|| vec![]),
+                self.matches
+                    .values_of("line-range")
+                    .map(|vs| vs.map(LineRange::from).collect())
+                    .transpose()?
+                    .unwrap_or_else(|| vec![]),
             ),
             output_components,
             syntax_mapping,
@@ -247,13 +245,15 @@ impl App {
             } else if matches.is_present("plain") {
                 [OutputComponent::Plain].iter().cloned().collect()
             } else {
-                let env_style_components: Option<Vec<OutputComponent>> =
-                    transpose(env::var("BAT_STYLE").ok().map(|style_str| {
+                let env_style_components: Option<Vec<OutputComponent>> = env::var("BAT_STYLE")
+                    .ok()
+                    .map(|style_str| {
                         style_str
                             .split(',')
                             .map(|x| OutputComponent::from_str(&x))
                             .collect::<Result<Vec<OutputComponent>>>()
-                    }))?;
+                    })
+                    .transpose()?;
 
                 matches
                     .value_of("style")

src/bin/bat/config.rs

@@ -5,7 +5,7 @@ use std::path::PathBuf;
 
 use shell_words;
 
-use bat::{dirs::PROJECT_DIRS, util::transpose};
+use bat::dirs::PROJECT_DIRS;
 
 pub fn config_file() -> PathBuf {
     env::var("BAT_CONFIG_PATH")
@@ -16,12 +16,11 @@ pub fn config_file() -> PathBuf {
 }
 
 pub fn get_args_from_config_file() -> Result<Vec<OsString>, shell_words::ParseError> {
-    Ok(transpose(
-        fs::read_to_string(config_file())
-            .ok()
-            .map(|content| get_args_from_str(&content)),
-    )?
-    .unwrap_or_else(|| vec![]))
+    Ok(fs::read_to_string(config_file())
+        .ok()
+        .map(|content| get_args_from_str(&content))
+        .transpose()?
+        .unwrap_or_else(|| vec![]))
 }
 
 pub fn get_args_from_env_var() -> Option<Result<Vec<OsString>, shell_words::ParseError>> {

src/lib.rs

@@ -31,7 +31,6 @@ pub mod printer;
 pub mod style;
 pub mod syntax_mapping;
 pub mod terminal;
-pub mod util;
 
 pub mod errors {
     error_chain! {

src/util.rs

@@ -1,27 +0,0 @@
-/// Helper function that might appear in Rust stable at some point
-/// (https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.transpose)
-pub fn transpose<T, E>(opt: Option<Result<T, E>>) -> Result<Option<T>, E> {
-    opt.map_or(Ok(None), |res| res.map(Some))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::transpose;
-
-    #[derive(Debug, PartialEq)]
-    struct TestError;
-
-    type TestResult<T> = Result<T, TestError>;
-
-    #[test]
-    fn basic() {
-        let a: Option<TestResult<i32>> = Some(Ok(2));
-        assert_eq!(Ok(Some(2)), transpose(a));
-
-        let b: Option<TestResult<i32>> = Some(Err(TestError));
-        assert_eq!(Err(TestError), transpose(b));
-
-        let c: Option<TestResult<i32>> = None;
-        assert_eq!(Ok(None), transpose(c));
-    }
-}