make LESSOPEN support opt-in

assets/completions/_bat.ps1.in

@@ -59,7 +59,8 @@ Register-ArgumentCompleter -Native -CommandName '{{PROJECT_EXECUTABLE}}' -Script
             [CompletionResult]::new('--unbuffered', 'unbuffered', [CompletionResultType]::ParameterName, 'unbuffered')
             [CompletionResult]::new('--no-config', 'no-config', [CompletionResultType]::ParameterName, 'Do not use the configuration file')
             [CompletionResult]::new('--no-custom-assets', 'no-custom-assets', [CompletionResultType]::ParameterName, 'Do not load custom assets')
-            [CompletionResult]::new('--no-lessopen', 'no-lessopen', [CompletionResultType]::ParameterName, 'Do not use the $LESSOPEN preprocessor')
+            [CompletionResult]::new('--lessopen', 'lessopen', [CompletionResultType]::ParameterName, 'Enable the $LESSOPEN preprocessor')
+            [CompletionResult]::new('--no-lessopen', 'no-lessopen', [CompletionResultType]::ParameterName, 'Disable the $LESSOPEN preprocessor if enabled (overrides --lessopen)')
             [CompletionResult]::new('--config-file', 'config-file', [CompletionResultType]::ParameterName, 'Show path to the configuration file.')
             [CompletionResult]::new('--generate-config-file', 'generate-config-file', [CompletionResultType]::ParameterName, 'Generates a default configuration file.')
             [CompletionResult]::new('--config-dir', 'config-dir', [CompletionResultType]::ParameterName, 'Show bat''s configuration directory.')

assets/completions/bat.bash.in

@@ -78,6 +78,7 @@ _bat() {
 	--list-themes | \
 	--line-range | \
 	-L | --list-languages | \
+	--lessopen | \
 	--diagnostic | \
 	--acknowledgements | \
 	-h | --help | \
@@ -171,6 +172,7 @@ _bat() {
 			--style
 			--line-range
 			--list-languages
+			--lessopen
 			--diagnostic
 			--acknowledgements
 			--help

assets/completions/bat.fish.in

@@ -163,6 +163,8 @@ complete -c $bat -l italic-text -x -a "$italic_text_opts" -d "When to use italic
 
 complete -c $bat -s l -l language -x -k -a "(__bat_complete_list_languages)" -d "Set the syntax highlighting language" -n __bat_no_excl_args
 
+complete -c $bat -l lessopen -d "Enable the $LESSOPEN preprocessor" -n __fish_is_first_arg
+
 complete -c $bat -s r -l line-range -x -d "Only print lines [M]:[N] (either optional)" -n __bat_no_excl_args
 
 complete -c $bat -l list-languages -f -d "List syntax highlighting languages" -n __fish_is_first_arg

assets/completions/bat.zsh.in

@@ -46,7 +46,8 @@ _{{PROJECT_EXECUTABLE}}_main() {
         '(: --list-themes --list-languages -L)'{-L,--list-languages}'[Display all supported languages]'
         '(: --no-config)'--no-config'[Do not use the configuration file]'
         '(: --no-custom-assets)'--no-custom-assets'[Do not load custom assets]'
-        '(: --no-lessopen)'--no-lessopen'[Do not use the $LESSOPEN preprocessor]'
+        '(: --lessopen)'--lessopen'[Enable the $LESSOPEN preprocessor]'
+        '(: --no-lessopen)'--no-lessopen'[Disable the $LESSOPEN preprocessor if enabled (overrides --lessopen)]'
         '(: --config-dir)'--config-dir'[Show bat'"'"'s configuration directory]'
         '(: --config-file)'--config-file'[Show path to the configuration file]'
         '(: --generate-config-file)'--generate-config-file'[Generates a default configuration file]'

assets/manual/bat.1.in

@@ -248,7 +248,13 @@ These can be installed to `\fB$({{PROJECT_EXECUTABLE}} --config-dir)/themes\fR`,
 Much like less(1) does, {{PROJECT_EXECUTABLE}} supports input preprocessors via the LESSOPEN and LESSCLOSE environment variables.
 In addition, {{PROJECT_EXECUTABLE}} attempts to be as compatible with less's preprocessor implementation as possible.
 
-To run {{PROJECT_EXECUTABLE}} without using the preprocessor, call:
+To use the preprocessor, call:
+
+\fB{{PROJECT_EXECUTABLE}} --lessopen\fR
+
+Alternatively, the preprocessor may be enabled by default by adding the '\-\-lessopen' option to the configuration file. 
+
+To temporarily disable the preprocessor if it is enabled by default, call:
 
 \fB{{PROJECT_EXECUTABLE}} --no-lessopen\fR
 

src/bin/bat/app.rs

@@ -282,7 +282,7 @@ impl App {
                 .unwrap_or_default(),
             use_custom_assets: !self.matches.get_flag("no-custom-assets"),
             #[cfg(feature = "lessopen")]
-            use_lessopen: !self.matches.get_flag("no-lessopen"),
+            use_lessopen: self.matches.get_flag("lessopen"),
         })
     }
 

src/bin/bat/clap_app.rs

@@ -501,13 +501,21 @@ pub fn build_app(interactive_output: bool) -> Command {
 
     #[cfg(feature = "lessopen")]
     {
-        app = app.arg(
-            Arg::new("no-lessopen")
-                .long("no-lessopen")
-                .action(ArgAction::SetTrue)
-                .hide(true)
-                .help("Do not use the $LESSOPEN preprocessor"),
-        )
+        app = app
+            .arg(
+                Arg::new("lessopen")
+                    .long("lessopen")
+                    .action(ArgAction::SetTrue)
+                    .help("Enable the $LESSOPEN preprocessor"),
+            )
+            .arg(
+                Arg::new("no-lessopen")
+                    .long("no-lessopen")
+                    .action(ArgAction::SetTrue)
+                    .overrides_with("lessopen")
+                    .hide(true)
+                    .help("Disable the $LESSOPEN preprocessor if enabled (overrides --lessopen)"),
+            )
     }
 
     app = app

tests/integration_tests.rs

@@ -2079,6 +2079,7 @@ fn acknowledgements() {
 fn lessopen_file_piped() {
     bat()
         .env("LESSOPEN", "|echo File is %s")
+        .arg("--lessopen")
         .arg("test.txt")
         .assert()
         .success()
@@ -2091,6 +2092,7 @@ fn lessopen_file_piped() {
 fn lessopen_stdin_piped() {
     bat()
         .env("LESSOPEN", "|cat")
+        .arg("--lessopen")
         .write_stdin("hello world\n")
         .assert()
         .success()
@@ -2107,6 +2109,7 @@ fn lessopen_and_lessclose_file_temp() {
     bat()
         .env("LESSOPEN", "echo empty.txt")
         .env("LESSCLOSE", "echo lessclose: %s %s")
+        .arg("--lessopen")
         .arg("test.txt")
         .assert()
         .success()
@@ -2124,6 +2127,7 @@ fn lessopen_and_lessclose_file_piped() {
         // This test will not work properly if $LESSOPEN does not output anything
         .env("LESSOPEN", "|cat test.txt ")
         .env("LESSCLOSE", "echo lessclose: %s %s")
+        .arg("--lessopen")
         .arg("empty.txt")
         .assert()
         .success()
@@ -2132,6 +2136,7 @@ fn lessopen_and_lessclose_file_piped() {
     bat()
         .env("LESSOPEN", "||cat empty.txt")
         .env("LESSCLOSE", "echo lessclose: %s %s")
+        .arg("--lessopen")
         .arg("empty.txt")
         .assert()
         .success()
@@ -2148,6 +2153,7 @@ fn lessopen_and_lessclose_stdin_temp() {
     bat()
         .env("LESSOPEN", "-echo empty.txt")
         .env("LESSCLOSE", "echo lessclose: %s %s")
+        .arg("--lessopen")
         .write_stdin("test.txt")
         .assert()
         .success()
@@ -2165,6 +2171,7 @@ fn lessopen_and_lessclose_stdin_piped() {
         // This test will not work properly if $LESSOPEN does not output anything
         .env("LESSOPEN", "|-cat test.txt")
         .env("LESSCLOSE", "echo lessclose: %s %s")
+        .arg("--lessopen")
         .write_stdin("empty.txt")
         .assert()
         .success()
@@ -2173,6 +2180,7 @@ fn lessopen_and_lessclose_stdin_piped() {
     bat()
         .env("LESSOPEN", "||-cat empty.txt")
         .env("LESSCLOSE", "echo lessclose: %s %s")
+        .arg("--lessopen")
         .write_stdin("empty.txt")
         .assert()
         .success()
@@ -2185,6 +2193,7 @@ fn lessopen_and_lessclose_stdin_piped() {
 fn lessopen_handling_empty_output_file() {
     bat()
         .env("LESSOPEN", "|cat empty.txt")
+        .arg("--lessopen")
         .arg("test.txt")
         .assert()
         .success()
@@ -2192,6 +2201,7 @@ fn lessopen_handling_empty_output_file() {
 
     bat()
         .env("LESSOPEN", "|cat nonexistent.txt")
+        .arg("--lessopen")
         .arg("test.txt")
         .assert()
         .success()
@@ -2199,6 +2209,7 @@ fn lessopen_handling_empty_output_file() {
 
     bat()
         .env("LESSOPEN", "||cat empty.txt")
+        .arg("--lessopen")
         .arg("test.txt")
         .assert()
         .success()
@@ -2206,6 +2217,7 @@ fn lessopen_handling_empty_output_file() {
 
     bat()
         .env("LESSOPEN", "||cat nonexistent.txt")
+        .arg("--lessopen")
         .arg("test.txt")
         .assert()
         .success()
@@ -2218,6 +2230,7 @@ fn lessopen_handling_empty_output_file() {
 fn lessopen_handling_empty_output_stdin() {
     bat()
         .env("LESSOPEN", "|-cat empty.txt")
+        .arg("--lessopen")
         .write_stdin("hello world\n")
         .assert()
         .success()
@@ -2225,6 +2238,7 @@ fn lessopen_handling_empty_output_stdin() {
 
     bat()
         .env("LESSOPEN", "|-cat nonexistent.txt")
+        .arg("--lessopen")
         .write_stdin("hello world\n")
         .assert()
         .success()
@@ -2232,6 +2246,7 @@ fn lessopen_handling_empty_output_stdin() {
 
     bat()
         .env("LESSOPEN", "||-cat empty.txt")
+        .arg("--lessopen")
         .write_stdin("hello world\n")
         .assert()
         .success()
@@ -2239,6 +2254,7 @@ fn lessopen_handling_empty_output_stdin() {
 
     bat()
         .env("LESSOPEN", "||-cat nonexistent.txt")
+        .arg("--lessopen")
         .write_stdin("hello world\n")
         .assert()
         .success()
@@ -2251,6 +2267,7 @@ fn lessopen_handling_empty_output_stdin() {
 fn lessopen_uses_shell() {
     bat()
         .env("LESSOPEN", "|cat < %s")
+        .arg("--lessopen")
         .arg("test.txt")
         .assert()
         .success()
@@ -2260,9 +2277,22 @@ fn lessopen_uses_shell() {
 #[cfg(unix)]
 #[cfg(feature = "lessopen")]
 #[test]
-fn do_not_use_lessopen() {
+fn do_not_use_lessopen_by_default() {
     bat()
         .env("LESSOPEN", "|echo File is %s")
+        .arg("test.txt")
+        .assert()
+        .success()
+        .stdout("hello world\n");
+}
+
+#[cfg(unix)]
+#[cfg(feature = "lessopen")]
+#[test]
+fn do_not_use_lessopen_if_overridden() {
+    bat()
+        .env("LESSOPEN", "|echo File is %s")
+        .arg("--lessopen")
         .arg("--no-lessopen")
         .arg("test.txt")
         .assert()