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.
Prevent less from wrapping lines by setting the proper flag when `--wrap=never`.
If the user set a custom value for `--pager`, no additional flag is set.
## [why]
For 'windows' platforms, directly spawning a process (eg, called PATHNAME) bypasses the
usual windows shell machinery for determining which process to execute. Specifically,
the extensions in PATHEXT will not be used to determine the final executable. So,
`PATHNAME.bat`, `PATHNAME.cmd`, ... will *not* be executed even if on they exist on the
PATH; and this is counter to the usual expectation of a Windows user. Additionally,
built-in commands, such as `echo` and `dir`, will never be accessible as they do not
have a PATH to execute and, so, will never be found.
To use the usual machinery, giving access to PATHNAME.bat and `echo`, execute the PATHNAME
using the windows shell, eg `cmd /d/c PATHNAME`. Note this may expose the constructed
command line to the windows shell quoting vagaries (sadly, that may be part of the price).
Following Windows standards, the ComSpec environment variable is used to determine which
shell to use, with a fallback to the "modern", built-in `cmd` shell.
We used to call `less` with
``` bash
less --RAW-CONTROL-CHARS --quit-if-one-screen --no-init
```
We only passed `--no-init` because there was a bug with previous versions
of `less` which required the use of `--no-init` in combination with
`--quit-if-one-screen` to prevent this "no output" issue from happening.
Since bat 0.13, [we omit the `--no-init` option](0ecc94956b/src/output.rs (L85-L97))
if we can detect that the version of `less` is higher than or equal to 530. We
did that because `--no-init` breaks mouse support and because [less 530 fixed
the above-mentioned bug](http://www.greenwoodsoftware.com/less/news.530.html).
However, it seems that this bug was *not* fixed on Windows!
According to @gwsw, the issue should be fixed with less 559 on Windows.
closes#887
When using `less` version 551 or newer, `bat` will now pass the `--mouse` argument, allowing
for (better) mouse scrolling support in some terminals.
closes#904
