Include theme_preview file in binary

src/app.rs

@@ -22,10 +22,17 @@ pub enum PagingMode {
     Never,
 }
 
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum InputFile<'a> {
+    StdIn,
+    Ordinary(&'a str),
+    ThemePreviewFile,
+}
+
 #[derive(Clone)]
 pub struct Config<'a> {
     /// List of files to print
-    pub files: Vec<Option<&'a str>>,
+    pub files: Vec<InputFile<'a>>,
 
     /// The explicitly configured language, if any
     pub language: Option<&'a str>,
@@ -341,7 +348,7 @@ impl App {
             paging_mode: match self.matches.value_of("paging") {
                 Some("always") => PagingMode::Always,
                 Some("never") => PagingMode::Never,
-                Some("auto") | _ => if files.contains(&None) {
+                Some("auto") | _ => if files.contains(&InputFile::StdIn) {
                     // If we are reading from stdin, only enable paging if we write to an
                     // interactive terminal and if we do not *read* from an interactive
                     // terminal.
@@ -373,19 +380,19 @@ impl App {
         })
     }
 
-    fn files(&self) -> Vec<Option<&str>> {
+    fn files(&self) -> Vec<InputFile> {
         self.matches
             .values_of("FILE")
             .map(|values| {
                 values
                     .map(|filename| {
                         if filename == "-" {
-                            None
+                            InputFile::StdIn
                         } else {
-                            Some(filename)
+                            InputFile::Ordinary(filename)
                         }
                     }).collect()
-            }).unwrap_or_else(|| vec![None]) // read from stdin (None) if no args are given
+            }).unwrap_or_else(|| vec![InputFile::StdIn])
     }
 
     fn output_components(&self) -> Result<OutputComponents> {

src/assets.rs

@@ -11,6 +11,8 @@ use syntect::parsing::{SyntaxDefinition, SyntaxSet};
 #[cfg(unix)]
 use std::os::unix::fs::FileTypeExt;
 
+use app::InputFile;
+
 lazy_static! {
     static ref PROJECT_DIRS: ProjectDirs =
         ProjectDirs::from("", "", crate_name!()).expect("Could not get home directory");
@@ -164,10 +166,10 @@ impl HighlightingAssets {
         }
     }
 
-    pub fn get_syntax(&self, language: Option<&str>, filename: Option<&str>) -> &SyntaxDefinition {
+    pub fn get_syntax(&self, language: Option<&str>, filename: InputFile) -> &SyntaxDefinition {
         let syntax = match (language, filename) {
             (Some(language), _) => self.syntax_set.find_syntax_by_token(language),
-            (None, Some(filename)) => {
+            (None, InputFile::Ordinary(filename)) => {
                 #[cfg(not(unix))]
                 let may_read_from_file = true;
 
@@ -186,7 +188,8 @@ impl HighlightingAssets {
                     None
                 }
             }
-            (None, None) => None,
+            (None, InputFile::StdIn) => None,
+            (_, InputFile::ThemePreviewFile) => self.syntax_set.find_syntax_by_name("Rust"),
         };
 
         syntax.unwrap_or_else(|| self.syntax_set.find_syntax_plain_text())

src/controller.rs

@@ -1,7 +1,7 @@
 use std::fs::File;
 use std::io::{self, BufRead, BufReader, Write};
 
-use app::Config;
+use app::{Config, InputFile};
 use assets::HighlightingAssets;
 use errors::*;
 use line_range::LineRange;
@@ -41,17 +41,20 @@ impl<'b> Controller<'b> {
         Ok(no_errors)
     }
 
-    fn print_file<P: Printer>(
+    fn print_file<'a, P: Printer>(
         &self,
         printer: &mut P,
         writer: &mut Write,
-        filename: Option<&str>,
+        filename: InputFile<'a>,
     ) -> Result<()> {
         let stdin = io::stdin();
         {
+            let theme_preview_file = include_bytes!("../assets/theme_preview.rs");
+
             let reader: Box<BufRead> = match filename {
-                None => Box::new(stdin.lock()),
-                Some(filename) => Box::new(BufReader::new(File::open(filename)?)),
+                InputFile::StdIn => Box::new(stdin.lock()),
+                InputFile::Ordinary(filename) => Box::new(BufReader::new(File::open(filename)?)),
+                InputFile::ThemePreviewFile => Box::new(&theme_preview_file[..]),
             };
 
             printer.print_header(writer, filename)?;

src/main.rs

@@ -36,7 +36,7 @@ use std::process;
 use ansi_term::Colour::Green;
 use ansi_term::Style;
 
-use app::{App, Config};
+use app::{App, Config, InputFile};
 use assets::{clear_assets, config_dir, HighlightingAssets};
 use controller::Controller;
 use style::{OutputComponent, OutputComponents};
@@ -136,7 +136,7 @@ pub fn list_themes(assets: &HighlightingAssets, cfg: &Config) {
     let mut config = cfg.clone();
     let mut style = HashSet::new();
     style.insert(OutputComponent::Plain);
-    config.files = vec![Some("assets/theme_preview.rs")];
+    config.files = vec![InputFile::ThemePreviewFile];
     config.output_components = OutputComponents(style);
     for (theme, _) in themes.iter() {
         println!("Theme: {}\n", Style::new().bold().paint(theme.to_string()));

src/printer.rs

@@ -10,7 +10,7 @@ use console::AnsiCodeIterator;
 use syntect::easy::HighlightLines;
 use syntect::highlighting::Theme;
 
-use app::Config;
+use app::{Config, InputFile};
 use assets::HighlightingAssets;
 use decorations::{Decoration, GridBorderDecoration, LineChangesDecoration, LineNumberDecoration};
 use diff::get_git_diff;
@@ -20,7 +20,7 @@ use style::OutputWrap;
 use terminal::{as_terminal_escaped, to_ansi_color};
 
 pub trait Printer {
-    fn print_header(&mut self, handle: &mut Write, filename: Option<&str>) -> Result<()>;
+    fn print_header(&mut self, handle: &mut Write, file: InputFile) -> Result<()>;
     fn print_footer(&mut self, handle: &mut Write) -> Result<()>;
     fn print_line(
         &mut self,
@@ -40,7 +40,7 @@ impl SimplePrinter {
 }
 
 impl Printer for SimplePrinter {
-    fn print_header(&mut self, _handle: &mut Write, _filename: Option<&str>) -> Result<()> {
+    fn print_header(&mut self, _handle: &mut Write, _file: InputFile) -> Result<()> {
         Ok(())
     }
 
@@ -73,7 +73,7 @@ pub struct InteractivePrinter<'a> {
 }
 
 impl<'a> InteractivePrinter<'a> {
-    pub fn new(config: &'a Config, assets: &'a HighlightingAssets, filename: Option<&str>) -> Self {
+    pub fn new(config: &'a Config, assets: &'a HighlightingAssets, file: InputFile) -> Self {
         let theme = assets.get_theme(&config.theme);
 
         let colors = if config.colored_output {
@@ -113,10 +113,13 @@ impl<'a> InteractivePrinter<'a> {
         }
 
         // Get the Git modifications
-        let line_changes = filename.and_then(|file| get_git_diff(file));
+        let line_changes = match file {
+            InputFile::Ordinary(filename) => get_git_diff(filename),
+            _ => None,
+        };
 
         // Determine the type of syntax for highlighting
-        let syntax = assets.get_syntax(config.language, filename);
+        let syntax = assets.get_syntax(config.language, file);
         let highlighter = HighlightLines::new(syntax, theme);
 
         InteractivePrinter {
@@ -148,7 +151,7 @@ impl<'a> InteractivePrinter<'a> {
 }
 
 impl<'a> Printer for InteractivePrinter<'a> {
-    fn print_header(&mut self, handle: &mut Write, filename: Option<&str>) -> Result<()> {
+    fn print_header(&mut self, handle: &mut Write, file: InputFile) -> Result<()> {
         if !self.config.output_components.header() {
             return Ok(());
         }
@@ -168,12 +171,12 @@ impl<'a> Printer for InteractivePrinter<'a> {
             write!(handle, "{}", " ".repeat(self.panel_width))?;
         }
 
-        writeln!(
-            handle,
-            "{}{}",
-            filename.map_or("", |_| "File: "),
-            self.colors.filename.paint(filename.unwrap_or("STDIN"))
-        )?;
+        let (prefix, name) = match file {
+            InputFile::Ordinary(filename) => ("File: ", filename),
+            _ => ("", "STDIN"),
+        };
+
+        writeln!(handle, "{}{}", prefix, self.colors.filename.paint(name))?;
 
         if self.config.output_components.grid() {
             self.print_horizontal_line(handle, '┼')?;