Updates for review of PR 899

ci/script.bash

@@ -17,3 +17,4 @@ fi
 cargo check --target "$TARGET" --verbose --lib --no-default-features
 cargo check --target "$TARGET" --verbose --lib --no-default-features --features git
 cargo check --target "$TARGET" --verbose --lib --no-default-features --features paging
+cargo check --target "$TARGET" --verbose --lib --no-default-features --features git,paging

src/config.rs

@@ -5,14 +5,14 @@ pub use crate::syntax_mapping::{MappingTarget, SyntaxMapping};
 pub use crate::wrap::OutputWrap;
 
 #[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg(feature = "paging")]
 pub enum PagingMode {
-    #[cfg(feature = "paging")]
     Always,
-    #[cfg(feature = "paging")]
     QuitIfOneScreen,
     Never,
 }
 
+#[cfg(feature = "paging")]
 impl Default for PagingMode {
     fn default() -> Self {
         PagingMode::Never
@@ -53,6 +53,7 @@ pub struct Config<'a> {
     pub output_wrap: OutputWrap,
 
     /// Pager or STDOUT
+    #[cfg(feature = "paging")]
     pub paging_mode: PagingMode,
 
     /// Specifies the lines that should be printed

src/controller.rs

@@ -1,8 +1,9 @@
 use std::io::{self, Write};
-use std::path::Path;
 
 use crate::assets::HighlightingAssets;
-use crate::config::{Config, PagingMode};
+use crate::config::Config;
+#[cfg(feature = "paging")]
+use crate::config::PagingMode;
 use crate::errors::*;
 use crate::inputfile::{InputFile, InputFileReader};
 use crate::line_range::{LineRanges, RangeCheckResult};
@@ -24,22 +25,34 @@ impl<'b> Controller<'b> {
     }
 
     pub fn run_with_error_handler(&self, handle_error: impl Fn(&Error)) -> Result<bool> {
-        // Do not launch the pager if NONE of the input files exist
-        let mut paging_mode = self.config.paging_mode;
-        if self.config.paging_mode != PagingMode::Never {
-            let call_pager = self.config.files.iter().any(|file| {
-                if let InputFile::Ordinary(path) = file {
-                    return Path::new(path).exists();
-                } else {
-                    return true;
+        let mut output_type;
+
+        #[cfg(feature = "paging")]
+        {
+            use std::path::Path;
+
+            // Do not launch the pager if NONE of the input files exist
+            let mut paging_mode = self.config.paging_mode;
+            if self.config.paging_mode != PagingMode::Never {
+                let call_pager = self.config.files.iter().any(|file| {
+                    if let InputFile::Ordinary(path) = file {
+                        return Path::new(path).exists();
+                    } else {
+                        return true;
+                    }
+                });
+                if !call_pager {
+                    paging_mode = PagingMode::Never;
                 }
-            });
-            if !call_pager {
-                paging_mode = PagingMode::Never;
             }
+            output_type = OutputType::from_mode(paging_mode, self.config.pager)?;
+        }
+
+        #[cfg(not(feature = "paging"))]
+        {
+            output_type = OutputType::stdout();
         }
 
-        let mut output_type = OutputType::from_mode(paging_mode, self.config.pager)?;
         let writer = output_type.handle()?;
         let mut no_errors: bool = true;
 

src/errors.rs

@@ -2,20 +2,20 @@ use error_chain::error_chain;
 
 error_chain! {
     foreign_links {
-        Clap(clap::Error);
-        Io(std::io::Error);
-        SyntectError(syntect::LoadingError);
-        ParseIntError(std::num::ParseIntError);
-        GlobParsingError(globset::Error);
+        Clap(::clap::Error) #[cfg(feature = "application")];
+        Io(::std::io::Error);
+        SyntectError(::syntect::LoadingError);
+        ParseIntError(::std::num::ParseIntError);
+        GlobParsingError(::globset::Error);
     }
 }
 
 pub fn default_error_handler(error: &Error) {
     match error {
         Error(ErrorKind::Io(ref io_error), _)
-            if io_error.kind() == std::io::ErrorKind::BrokenPipe =>
+            if io_error.kind() == ::std::io::ErrorKind::BrokenPipe =>
         {
-            std::process::exit(0);
+            ::std::process::exit(0);
         }
         _ => {
             use ansi_term::Colour::Red;
@@ -23,36 +23,3 @@ pub fn default_error_handler(error: &Error) {
         }
     };
 }
-
-// Mock out a type for clap::Error if we aren't pulling in a dependency on clap.
-//
-// This can be removed after migrating away from error_chain to some modern
-// derive-based error library such as thiserror, in favor of:
-//
-//     #[derive(Error)]
-//     pub enum Error {
-//         #[cfg(feature = "application")]
-//         Clap(clap::Error),
-//         ...
-//     }
-//
-#[cfg(not(feature = "application"))]
-mod clap {
-    use std::fmt::{self, Debug, Display};
-
-    pub struct Error(());
-
-    impl Display for Error {
-        fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
-            unreachable!()
-        }
-    }
-
-    impl Debug for Error {
-        fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
-            unreachable!()
-        }
-    }
-
-    impl std::error::Error for Error {}
-}

src/output.rs

@@ -2,6 +2,7 @@ use std::io::{self, Write};
 #[cfg(feature = "paging")]
 use std::process::Child;
 
+#[cfg(feature = "paging")]
 use crate::config::PagingMode;
 use crate::errors::*;
 #[cfg(feature = "paging")]
@@ -15,13 +16,12 @@ pub enum OutputType {
 }
 
 impl OutputType {
+    #[cfg(feature = "paging")]
     pub fn from_mode(mode: PagingMode, pager: Option<&str>) -> Result<Self> {
-        let _ = pager;
+        use self::PagingMode::*;
         Ok(match mode {
-            #[cfg(feature = "paging")]
-            PagingMode::Always => OutputType::try_pager(false, pager)?,
-            #[cfg(feature = "paging")]
-            PagingMode::QuitIfOneScreen => OutputType::try_pager(true, pager)?,
+            Always => OutputType::try_pager(false, pager)?,
+            QuitIfOneScreen => OutputType::try_pager(true, pager)?,
             _ => OutputType::stdout(),
         })
     }
@@ -116,7 +116,7 @@ impl OutputType {
         }
     }
 
-    fn stdout() -> Self {
+    pub(crate) fn stdout() -> Self {
         OutputType::Stdout(io::stdout())
     }