override the default pager on Windows if not found

If the pager is set to "less", the default, and we cannot find "less"
on the PATH, fall back to "more", a Windows builtin.

It would be cleaner for myclirc to have some kind of "pager = auto"
setting but it is likely too late for that.

Addresses issue #1260 .

Author: rolandwalker

changelog.md

@@ -1,6 +1,11 @@
 Upcoming Release (TBD)
 ======================
 
+Bug Fixes
+--------
+* Help Windows installations find a working default pager.
+
+
 Internal
 --------
 

mycli/main.py

@@ -1016,6 +1016,11 @@ def configure_pager(self):
 
         cnf = self.read_my_cnf_files(self.cnf_files, ["pager", "skip-pager"])
         cnf_pager = cnf["pager"] or self.config["main"]["pager"]
+
+        # help Windows users who haven't edited the default myclirc
+        if WIN and cnf_pager == 'less' and not shutil.which(cnf_pager):
+            cnf_pager = 'more'
+
         if cnf_pager:
             special.set_pager(cnf_pager)
             self.explicit_pager = True