When PAGER=most, don't print a warning to stderr, silently use less instead

CHANGELOG.md

@@ -11,7 +11,7 @@
 - Make ./tests/syntax-tests/regression_test.sh work on recent versions of macOS, see #1443 (@Enselic)
 - VimL syntax highlighting fix, see #1450 (@esensar)
 - Print an 'Invalid syntax theme settings' error message if a custom theme is broken, see #614 (@Enselic)
-- Ignore PAGER=most with a warning to stderr, but allow override with BAT_PAGER or --config, see #1063 (@Enselic)
+- If `PAGER=most` (but not `BAT_PAGER` or `--pager`), silently use `less` instead since `most` does not support colors, see #1063 (@Enselic)
 
 ## Other
 

src/output.rs

@@ -52,7 +52,6 @@ impl OutputType {
         use std::path::PathBuf;
         use std::process::{Command, Stdio};
         use crate::pager::*;
-        use crate::bat_warning;
 
         let Pager { pager, source } = get_pager(pager_from_config);
 
@@ -60,16 +59,18 @@ impl OutputType {
             shell_words::split(&pager).chain_err(|| "Could not parse pager command.")?;
 
         match pagerflags.split_first() {
-            Some((pager_name, args)) => {
-                let pager_path = PathBuf::from(pager_name);
+            Some((pager_name, pager_args)) => {
+                let mut pager_path = PathBuf::from(pager_name);
+                let mut args = pager_args;
+                let empty_args = vec![];
 
                 if pager_path.file_stem() == Some(&OsString::from("bat")) {
                     return Err(ErrorKind::InvalidPagerValueBat.into());
                 }
 
                 if pager_path.file_stem() == Some(&OsString::from("most")) && source == PagerSource::PagerEnvVar {
-                    bat_warning!("Ignoring PAGER=\"{}\": Coloring not supported. Override with BAT_PAGER=\"{}\" or --pager \"{}\"", pager, pager, pager);
-                    return Ok(OutputType::stdout());
+                    pager_path = PathBuf::from("less");
+                    args = &empty_args;
                 }
 
                 let is_less = pager_path.file_stem() == Some(&OsString::from("less"));

tests/integration_tests.rs

@@ -423,8 +423,8 @@ fn pager_most() {
         .arg("test.txt")
         .assert()
         .success()
-        .stderr(predicate::eq("\x1b[33m[bat warning]\x1b[0m: Ignoring PAGER=\"most\": Coloring not supported. Override with BAT_PAGER=\"most\" or --pager \"most\"\n").normalize())
         .stdout(predicate::eq("hello world\n").normalize());
+    // TODO: How to ensure less is used?
 }
 
 #[test]
@@ -435,8 +435,8 @@ fn pager_most_with_arg() {
         .arg("test.txt")
         .assert()
         .success()
-        .stderr(predicate::eq("\x1b[33m[bat warning]\x1b[0m: Ignoring PAGER=\"most -w\": Coloring not supported. Override with BAT_PAGER=\"most -w\" or --pager \"most -w\"\n").normalize())
         .stdout(predicate::eq("hello world\n").normalize());
+    // TODO: How to ensure less is used?
 }
 
 #[test]