[breaking] Remove special handling for theme previews

CHANGELOG.md

@@ -51,6 +51,9 @@
 - `PrettyPrinter::vcs_modification_markers` has been marked deprecated when building without the `git` feature, see #997 and #1020 (@eth-p, @sharkdp)
 - Add APIs to provide `Input` descriptions with `InputDescription` (@eth-p)
 - Add function to directly provide `Input`s to `PrettyPrinter` (@eth-p)
+- <font color="red">`Input::theme_preview_file` is no longer available.</font> (@eth-p)
+
+Changes colored <font color="red">red</font> are breaking changes.
 
 ## Packaging
 

src/assets.rs

@@ -193,11 +193,7 @@ impl HighlightingAssets {
         input: &mut OpenedInput,
         mapping: &SyntaxMapping,
     ) -> Result<&SyntaxReference> {
-        if input.kind.is_theme_preview_file() {
-            self.syntax_set
-                .find_syntax_by_name("Rust")
-                .ok_or_else(|| ErrorKind::UnknownSyntax("Rust".to_owned()).into())
-        } else if let Some(language) = language {
+        if let Some(language) = language {
             self.syntax_set
                 .find_syntax_by_token(language)
                 .ok_or_else(|| ErrorKind::UnknownSyntax(language.to_owned()).into())

src/bin/bat/main.rs

@@ -10,7 +10,7 @@ mod directories;
 use std::collections::HashSet;
 use std::ffi::OsStr;
 use std::io;
-use std::io::Write;
+use std::io::{BufReader, Write};
 use std::path::Path;
 use std::process;
 
@@ -25,6 +25,7 @@ use assets::{assets_from_cache_or_binary, cache_dir, clear_assets, config_dir};
 use clap::crate_version;
 use directories::PROJECT_DIRS;
 
+use bat::input::InputDescription;
 use bat::{
     assets::HighlightingAssets,
     config::Config,
@@ -34,6 +35,8 @@ use bat::{
     style::{StyleComponent, StyleComponents},
 };
 
+const THEME_PREVIEW_DATA: &[u8] = include_bytes!("../../../assets/theme_preview.rs");
+
 fn run_cache_subcommand(matches: &clap::ArgMatches) -> Result<()> {
     if matches.is_present("build") {
         let source_dir = matches
@@ -118,6 +121,12 @@ pub fn list_languages(config: &Config) -> Result<()> {
     Ok(())
 }
 
+fn theme_preview_file<'a>() -> Input<'a> {
+    Input::from_reader(Box::new(BufReader::new(THEME_PREVIEW_DATA)))
+        .with_name(Some("theme.rs".as_ref()))
+        .with_description(Some(InputDescription::new("")))
+}
+
 pub fn list_themes(cfg: &Config) -> Result<()> {
     let assets = assets_from_cache_or_binary()?;
     let mut config = cfg.clone();
@@ -137,7 +146,7 @@ pub fn list_themes(cfg: &Config) -> Result<()> {
             )?;
             config.theme = theme.to_string();
             Controller::new(&config, &assets)
-                .run(vec![Input::theme_preview_file()])
+                .run(vec![theme_preview_file()])
                 .ok();
             writeln!(stdout)?;
         }

src/input.rs

@@ -6,8 +6,6 @@ use content_inspector::{self, ContentType};
 
 use crate::error::*;
 
-const THEME_PREVIEW_FILE: &[u8] = include_bytes!("../assets/theme_preview.rs");
-
 /// A description of an Input source.
 /// This tells bat how to refer to the input.
 #[derive(Clone)]
@@ -62,7 +60,6 @@ impl InputDescription {
 pub(crate) enum InputKind<'a> {
     OrdinaryFile(OsString),
     StdIn,
-    ThemePreviewFile,
     CustomReader(Box<dyn Read + 'a>),
 }
 
@@ -73,7 +70,6 @@ impl<'a> InputKind<'a> {
                 InputDescription::new(path.to_string_lossy()).with_kind(Some("File"))
             }
             InputKind::StdIn => InputDescription::new("STDIN"),
-            InputKind::ThemePreviewFile => InputDescription::new(""),
             InputKind::CustomReader(_) => InputDescription::new("READER"),
         }
     }
@@ -93,19 +89,9 @@ pub struct Input<'a> {
 pub(crate) enum OpenedInputKind {
     OrdinaryFile(OsString),
     StdIn,
-    ThemePreviewFile,
     CustomReader,
 }
 
-impl OpenedInputKind {
-    pub(crate) fn is_theme_preview_file(&self) -> bool {
-        match self {
-            OpenedInputKind::ThemePreviewFile => true,
-            _ => false,
-        }
-    }
-}
-
 pub(crate) struct OpenedInput<'a> {
     pub(crate) kind: OpenedInputKind,
     pub(crate) metadata: InputMetadata,
@@ -130,14 +116,6 @@ impl<'a> Input<'a> {
         }
     }
 
-    pub fn theme_preview_file() -> Self {
-        Input {
-            kind: InputKind::ThemePreviewFile,
-            metadata: InputMetadata::default(),
-            description: None,
-        }
-    }
-
     pub fn from_reader(reader: Box<dyn Read + 'a>) -> Self {
         Input {
             kind: InputKind::CustomReader(reader),
@@ -196,12 +174,6 @@ impl<'a> Input<'a> {
                     InputReader::new(BufReader::new(file))
                 },
             }),
-            InputKind::ThemePreviewFile => Ok(OpenedInput {
-                kind: OpenedInputKind::ThemePreviewFile,
-                description,
-                metadata: self.metadata,
-                reader: InputReader::new(THEME_PREVIEW_FILE),
-            }),
             InputKind::CustomReader(reader) => Ok(OpenedInput {
                 description,
                 kind: OpenedInputKind::CustomReader,