refactor: Switch from is_present to actions

Because "diff" is conditionally present, we need to check for it to
avoid some of clap's stricter checks meant to prevent bugs.

src/bin/bat/app.rs

@@ -85,7 +85,7 @@ impl App {
             Some("auto") | None => {
                 // If we have -pp as an option when in auto mode, the pager should be disabled.
                 let extra_plain = self.matches.get_count("plain") > 1;
-                if extra_plain || self.matches.is_present("no-paging") {
+                if extra_plain || self.matches.get_flag("no-paging") {
                     PagingMode::Never
                 } else if inputs.iter().any(Input::is_stdin) {
                     // If we are reading from stdin, only enable paging if we write to an
@@ -153,13 +153,13 @@ impl App {
                 .get_one::<String>("language")
                 .map(|s| s.as_str())
                 .or_else(|| {
-                    if self.matches.is_present("show-all") {
+                    if self.matches.get_flag("show-all") {
                         Some("show-nonprintable")
                     } else {
                         None
                     }
                 }),
-            show_nonprintable: self.matches.is_present("show-all"),
+            show_nonprintable: self.matches.get_flag("show-all"),
             wrapping_mode: if self.interactive_output || maybe_term_width.is_some() {
                 match self.matches.get_one::<String>("wrap").map(|s| s.as_str()) {
                     Some("character") => WrappingMode::Character,
@@ -178,7 +178,7 @@ impl App {
                 // There's no point in wrapping when this is the case.
                 WrappingMode::NoWrapping(false)
             },
-            colored_output: self.matches.is_present("force-colorization")
+            colored_output: self.matches.get_flag("force-colorization")
                 || match self.matches.get_one::<String>("color").map(|s| s.as_str()) {
                     Some("always") => true,
                     Some("never") => false,
@@ -194,7 +194,7 @@ impl App {
                     .get_one::<String>("decorations")
                     .map(|s| s.as_str())
                     == Some("always")
-                || self.matches.is_present("force-colorization")),
+                || self.matches.get_flag("force-colorization")),
             tab_width: self
                 .matches
                 .get_one::<String>("tabs")
@@ -221,7 +221,7 @@ impl App {
                     }
                 })
                 .unwrap_or_else(|| String::from(HighlightingAssets::default_theme())),
-            visible_lines: match self.matches.is_present("diff") {
+            visible_lines: match self.matches.contains_id("diff") && self.matches.get_flag("diff") {
                 #[cfg(feature = "git")]
                 true => VisibleLines::DiffContext(
                     self.matches
@@ -255,7 +255,7 @@ impl App {
                 .map(LineRanges::from)
                 .map(HighlightedLineRanges)
                 .unwrap_or_default(),
-            use_custom_assets: !self.matches.is_present("no-custom-assets"),
+            use_custom_assets: !self.matches.get_flag("no-custom-assets"),
         })
     }
 
@@ -310,7 +310,7 @@ impl App {
         let mut styled_components = StyleComponents(
             if matches.get_one::<String>("decorations").map(|s| s.as_str()) == Some("never") {
                 HashSet::new()
-            } else if matches.is_present("number") {
+            } else if matches.get_flag("number") {
                 [StyleComponent::LineNumbers].iter().cloned().collect()
             } else if 0 < matches.get_count("plain") {
                 [StyleComponent::Plain].iter().cloned().collect()

src/bin/bat/clap_app.rs

@@ -60,6 +60,7 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
                 .long("show-all")
                 .alias("show-nonprintable")
                 .short('A')
+                .action(ArgAction::SetTrue)
                 .conflicts_with("language")
                 .help("Show non-printable characters (space, tab, newline, ..).")
                 .long_help(
@@ -137,6 +138,7 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
                     Arg::new("diff")
                         .long("diff")
                         .short('d')
+                        .action(ArgAction::SetTrue)
                         .conflicts_with("line-range")
                         .help("Only show lines that have been added/removed/modified.")
                         .long_help(
@@ -229,6 +231,7 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
                 .long("number")
                 .overrides_with("number")
                 .short('n')
+                .action(ArgAction::SetTrue)
                 .help("Show line numbers (alias for '--style=numbers').")
                 .long_help(
                     "Only show line numbers, no other decorations. This is an alias for \
@@ -283,6 +286,7 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
             Arg::new("force-colorization")
                 .long("force-colorization")
                 .short('f')
+                .action(ArgAction::SetTrue)
                 .conflicts_with("color")
                 .conflicts_with("decorations")
                 .overrides_with("force-colorization")
@@ -314,6 +318,7 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
                 .short('P')
                 .long("no-paging")
                 .alias("no-pager")
+                .action(ArgAction::SetTrue)
                 .overrides_with("no-paging")
                 .hide(true)
                 .hide_short_help(true)
@@ -379,6 +384,7 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
         .arg(
             Arg::new("list-themes")
                 .long("list-themes")
+                .action(ArgAction::SetTrue)
                 .help("Display all supported highlighting themes.")
                 .long_help("Display a list of supported themes for syntax highlighting."),
         )
@@ -469,6 +475,7 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
             Arg::new("list-languages")
                 .long("list-languages")
                 .short('L')
+                .action(ArgAction::SetTrue)
                 .conflicts_with("list-themes")
                 .help("Display all supported languages.")
                 .long_help("Display a list of supported languages for syntax highlighting."),
@@ -493,12 +500,14 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
         .arg(
             Arg::new("no-custom-assets")
                 .long("no-custom-assets")
+                .action(ArgAction::SetTrue)
                 .hide(true)
                 .help("Do not load custom assets"),
         )
         .arg(
             Arg::new("config-file")
                 .long("config-file")
+                .action(ArgAction::SetTrue)
                 .conflicts_with("list-languages")
                 .conflicts_with("list-themes")
                 .hide(true)
@@ -507,6 +516,7 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
         .arg(
             Arg::new("generate-config-file")
                 .long("generate-config-file")
+                .action(ArgAction::SetTrue)
                 .conflicts_with("list-languages")
                 .conflicts_with("list-themes")
                 .hide(true)
@@ -515,12 +525,14 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
         .arg(
             Arg::new("config-dir")
                 .long("config-dir")
+                .action(ArgAction::SetTrue)
                 .hide(true)
                 .help("Show bat's configuration directory."),
         )
         .arg(
             Arg::new("cache-dir")
                 .long("cache-dir")
+                .action(ArgAction::SetTrue)
                 .hide(true)
                 .help("Show bat's cache directory."),
         )
@@ -528,12 +540,14 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
             Arg::new("diagnostic")
                 .long("diagnostic")
                 .alias("diagnostics")
+                .action(ArgAction::SetTrue)
                 .hide_short_help(true)
                 .help("Show diagnostic information for bug reports.")
         )
         .arg(
             Arg::new("acknowledgements")
                 .long("acknowledgements")
+                .action(ArgAction::SetTrue)
                 .hide_short_help(true)
                 .help("Show acknowledgements."),
         )
@@ -551,6 +565,7 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
                     Arg::new("build")
                         .long("build")
                         .short('b')
+                        .action(ArgAction::SetTrue)
                         .help("Initialize (or update) the syntax/theme cache.")
                         .long_help(
                             "Initialize (or update) the syntax/theme cache by loading from \
@@ -561,6 +576,7 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
                     Arg::new("clear")
                         .long("clear")
                         .short('c')
+                        .action(ArgAction::SetTrue)
                         .help("Remove the cached syntax definitions and themes."),
                 )
                 .group(
@@ -586,13 +602,20 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
                             "Use a different directory to store the cached syntax and theme set.",
                         ),
                 )
-                .arg(Arg::new("blank").long("blank").requires("build").help(
-                    "Create completely new syntax and theme sets \
+                .arg(
+                    Arg::new("blank")
+                        .long("blank")
+                        .action(ArgAction::SetTrue)
+                        .requires("build")
+                        .help(
+                            "Create completely new syntax and theme sets \
                              (instead of appending to the default sets).",
-                ))
+                        ),
+                )
                 .arg(
                     Arg::new("acknowledgements")
                         .long("acknowledgements")
+                        .action(ArgAction::SetTrue)
                         .requires("build")
                         .help("Build acknowledgements.bin."),
                 ),

src/bin/bat/main.rs

@@ -49,20 +49,20 @@ fn build_assets(matches: &clap::ArgMatches) -> Result<()> {
 
     bat::assets::build(
         source_dir,
-        !matches.is_present("blank"),
-        matches.is_present("acknowledgements"),
+        !matches.get_flag("blank"),
+        matches.get_flag("acknowledgements"),
         target_dir,
         clap::crate_version!(),
     )
 }
 
 fn run_cache_subcommand(matches: &clap::ArgMatches) -> Result<()> {
-    if matches.is_present("build") {
+    if matches.get_flag("build") {
         #[cfg(feature = "build-assets")]
         build_assets(matches)?;
         #[cfg(not(feature = "build-assets"))]
         println!("bat has been built without the 'build-assets' feature. The 'cache --build' option is not available.");
-    } else if matches.is_present("clear") {
+    } else if matches.get_flag("clear") {
         clear_assets();
     }
 
@@ -286,7 +286,7 @@ fn invoke_bugreport(app: &App) {
 fn run() -> Result<bool> {
     let app = App::new()?;
 
-    if app.matches.is_present("diagnostic") {
+    if app.matches.get_flag("diagnostic") {
         #[cfg(feature = "bugreport")]
         invoke_bugreport(&app);
         #[cfg(not(feature = "bugreport"))]
@@ -313,7 +313,7 @@ fn run() -> Result<bool> {
             let inputs = app.inputs()?;
             let config = app.config(&inputs)?;
 
-            if app.matches.is_present("list-languages") {
+            if app.matches.get_flag("list-languages") {
                 let languages: String = get_languages(&config)?;
                 let inputs: Vec<Input> = vec![Input::from_reader(Box::new(languages.as_bytes()))];
                 let plain_config = Config {
@@ -322,22 +322,22 @@ fn run() -> Result<bool> {
                     ..Default::default()
                 };
                 run_controller(inputs, &plain_config)
-            } else if app.matches.is_present("list-themes") {
+            } else if app.matches.get_flag("list-themes") {
                 list_themes(&config)?;
                 Ok(true)
-            } else if app.matches.is_present("config-file") {
+            } else if app.matches.get_flag("config-file") {
                 println!("{}", config_file().to_string_lossy());
                 Ok(true)
-            } else if app.matches.is_present("generate-config-file") {
+            } else if app.matches.get_flag("generate-config-file") {
                 generate_config_file()?;
                 Ok(true)
-            } else if app.matches.is_present("config-dir") {
+            } else if app.matches.get_flag("config-dir") {
                 writeln!(io::stdout(), "{}", config_dir())?;
                 Ok(true)
-            } else if app.matches.is_present("cache-dir") {
+            } else if app.matches.get_flag("cache-dir") {
                 writeln!(io::stdout(), "{}", cache_dir())?;
                 Ok(true)
-            } else if app.matches.is_present("acknowledgements") {
+            } else if app.matches.get_flag("acknowledgements") {
                 writeln!(io::stdout(), "{}", bat::assets::get_acknowledgements())?;
                 Ok(true)
             } else {