Add $LESSOPEN and $LESSCLOSE support (#2444)

Cargo.toml

@@ -21,6 +21,7 @@ application = [
     "build-assets",
     "git",
     "minimal-application",
+    "lessopen",
 ]
 # Mainly for developers that want to iterate quickly
 # Be aware that the included features might change in the future
@@ -33,6 +34,7 @@ minimal-application = [
 ]
 git = ["git2"] # Support indicating git modifications
 paging = ["shell-words", "grep-cli"] # Support applying a pager on the output
+lessopen = ["run_script", "os_str_bytes"] # Support $LESSOPEN preprocessor
 build-assets = ["syntect/yaml-load", "syntect/plist-load", "regex", "walkdir"]
 
 # You need to use one of these if you depend on bat as a library:
@@ -64,6 +66,8 @@ regex = { version = "1.8.3", optional = true }
 walkdir = { version = "2.3", optional = true }
 bytesize = { version = "1.2.0" }
 encoding_rs = "0.8.32"
+os_str_bytes = { version = "~6.4", optional = true }
+run_script = { version = "^0.10.0", optional = true}
 
 [dependencies.git2]
 version = "0.18"