I'm trying to set the pager used for Mercurial but the output is empty, even if I specify the command in the [pager] section or as the PAGER environment variable.

I noticed that the command provided is launched with cmd.exe. Is this the cause of empty output, and if yes, what is the right syntax?

Environment: Mercurial 1.5, Mecurial 1.4.3

hgrc:

[extensions]
pager =

[pager]
pager = d:\tools\less\less.exe

Sample command lines (from Process Explorer):

hg diff
c:\windows\system32\cmd.exe /c "d:\tools\less\less.exe 2> NUL:"
d:\tools\less\less.exe

UPDATE

In pager.py, by replacing:

sys.stderr = sys.stdout = util.popen(p, "wb")

with

sys.stderr = sys.stdout = subprocess.Popen(p, stdin = subprocess.PIPE, shell=False).stdin

I managed to obtain the desired output for the hg status and diff.

BUT, I'm sure it's wrong (or at least incomplete), and I have no control over the pager app (less.exe): the output is shown in the cmd.exe window, I can see the less prompt (:) but any further input is fed into cmd.exe. It seems that the pager app is still active in the background: after typing exit in the cmd.exe window, I have control over the pager app, and I can terminate it normally.

Also, it makes no difference what I'm choosing as a pager app (more is behaving the same).

UPDATE 2

Issue1677 - [PATCH] pager for "hg help" output on windows