Throws an error when bat is being user as pager.

As mentioned on #1334 `bat` should not be used as a value for `pager`,
this change checks both the balue of `bat` provided as a parameter or
as an environment variable.

src/error.rs

@@ -20,6 +20,10 @@ error_chain! {
             description("unknown syntax"),
             display("unknown syntax: '{}'", name)
         }
+        InvalidPagerValueBat {
+            description("invalid value `bat` for pager property"),
+            display("Use of bat as a pager is disallowed in order to avoid infinite recursion problems")
+        }
     }
 }
 

src/output.rs

@@ -85,10 +85,10 @@ impl OutputType {
 
         match pagerflags.split_first() {
             Some((pager_name, args)) => {
-                let mut pager_path = PathBuf::from(pager_name);
+                let pager_path = PathBuf::from(pager_name);
 
                 if pager_path.file_stem() == Some(&OsString::from("bat")) {
-                    pager_path = PathBuf::from("less");
+                    return Err(ErrorKind::InvalidPagerValueBat.into());
                 }
 
                 let is_less = pager_path.file_stem() == Some(&OsString::from("less"));

tests/integration_tests.rs

@@ -405,6 +405,16 @@ fn pager_disable() {
         .stdout(predicate::eq("hello world\n").normalize());
 }
 
+#[test]
+fn pager_value_bat() {
+    bat()
+        .arg("--pager=bat")
+        .arg("--paging=always")
+        .arg("test.txt")
+        .assert()
+        .failure();
+}
+
 #[test]
 fn alias_pager_disable() {
     bat()