`start-process` in Emacs on Windows seems to mangle process output

`start-process` in Emacs on Windows seems to mangle process output

[evgeniy.sharapov]

Here's the my problem. When I run

------------------------------------------------------------------
(let ((default-directory "C:/Users/esharapov/.emacs.d/"))
  (apply 'start-process "ag" (get-buffer-create "test")
         "c:\\App\\emacs\\libexec\\emacs\\24.5\\i686-pc-mingw32\\cmdproxy.exe"
         (list "-c" "\"ag\" \"--nocolor\"  \"--literal\" \"--line-number\" \"--smart-case\" \"--nogroup\" \"--column\" \"--stats\" \"--\" \"keymap-on\" \".\"")))
------------------------------------------------------------------

I get in the buffer following output: 

------------------------------------------------------------------
194:15:    (defmacro keymap-on-key (name keys)
233:9:       (keymap-on-key ctl-x-f-map "C-x f")
572:7:     (keymap-on-key ctl-z-w-map "C-z w")
194:15:    (defmacro keymap-on-key (name keys)

233:9:       (keymap-on-key ctl-x-f-map "C-x f")

572:7:     (keymap-on-key ctl-z-w-map "C-z w")

6 matches
382 files searched
8993756 bytes searched
0.446822 seconds

Process ag finished
------------------------------------------------------------------

However when I run it in the Windows command prompt as

------------------------------------------------------------------
c:\\App\\emacs\\libexec\\emacs\\24.5\\i686-pc-mingw32\\cmdproxy.exe /c "C:\\App\\bin\\ag.exe --nocolor  --literal --line-number --smart-case --nogroup --column --stats -- keymap-on ."
------------------------------------------------------------------

I get the following output 

------------------------------------------------------------------
#configuration.org#:194:15:    (defmacro keymap-on-key (name keys)
#configuration.org#:233:9:       (keymap-on-key ctl-x-f-map "C-x f")
#configuration.org#:572:7:     (keymap-on-key ctl-z-w-map "C-z w")
configuration.org:194:15:    (defmacro keymap-on-key (name keys)
configuration.org:233:9:       (keymap-on-key ctl-x-f-map "C-x f")
configuration.org:572:7:     (keymap-on-key ctl-z-w-map "C-z w")
6 matches
382 files searched
8993756 bytes searched
0.483917 seconds
-------------------------------------------------------------------

Notice when I use 'start-process' the file name is being removed from the process output. Does anyone know what's the issue here ?
Is it a bug or a feature that could be turned off  ?

Versions:
Microsoft Windows [Version 6.3.9600]
GNU Emacs 24.5.1 (i686-pc-mingw32) of 2015-04-11 on LEG570


Sincerely yours,
    Evgeniy Sharapov

Re: `start-process` in Emacs on Windows seems to mangle process output

[Eli Zaretskii]

> Date: Thu, 19 Nov 2015 06:49:30 -0800 (PST)
> From: evgeniy.sharapov@gmail.com
> Injection-Date: Thu, 19 Nov 2015 14:49:30 +0000
> 
> Here's the my problem. When I run
> 
> ------------------------------------------------------------------
> (let ((default-directory "C:/Users/esharapov/.emacs.d/"))
>   (apply 'start-process "ag" (get-buffer-create "test")
>          "c:\\App\\emacs\\libexec\\emacs\\24.5\\i686-pc-mingw32\\cmdproxy.exe"
>          (list "-c" "\"ag\" \"--nocolor\"  \"--literal\" \"--line-number\" \"--smart-case\" \"--nogroup\" \"--column\" \"--stats\" \"--\" \"keymap-on\" \".\"")))
> ------------------------------------------------------------------
> 
> I get in the buffer following output: 
> 
> ------------------------------------------------------------------
> 194:15:    (defmacro keymap-on-key (name keys)
> 233:9:       (keymap-on-key ctl-x-f-map "C-x f")
> 572:7:     (keymap-on-key ctl-z-w-map "C-z w")
> 194:15:    (defmacro keymap-on-key (name keys)
> 
> 233:9:       (keymap-on-key ctl-x-f-map "C-x f")
> 
> 572:7:     (keymap-on-key ctl-z-w-map "C-z w")
> 
> 6 matches
> 382 files searched
> 8993756 bytes searched
> 0.446822 seconds
> 
> Process ag finished

What kind of program is "ag"?  What does it do, and how?

> However when I run it in the Windows command prompt as
> 
> ------------------------------------------------------------------
> c:\\App\\emacs\\libexec\\emacs\\24.5\\i686-pc-mingw32\\cmdproxy.exe /c "C:\\App\\bin\\ag.exe --nocolor  --literal --line-number --smart-case --nogroup --column --stats -- keymap-on ."
> ------------------------------------------------------------------
> 
> I get the following output 
> 
> ------------------------------------------------------------------
> #configuration.org#:194:15:    (defmacro keymap-on-key (name keys)
> #configuration.org#:233:9:       (keymap-on-key ctl-x-f-map "C-x f")
> #configuration.org#:572:7:     (keymap-on-key ctl-z-w-map "C-z w")
> configuration.org:194:15:    (defmacro keymap-on-key (name keys)
> configuration.org:233:9:       (keymap-on-key ctl-x-f-map "C-x f")
> configuration.org:572:7:     (keymap-on-key ctl-z-w-map "C-z w")
> 6 matches
> 382 files searched
> 8993756 bytes searched
> 0.483917 seconds
> -------------------------------------------------------------------
> 
> Notice when I use 'start-process' the file name is being removed from the process output. Does anyone know what's the issue here ?

Does "ag", whatever it is, behave differently depending on whether its
standard output is a console device or something else?

Also, are you sure the same "ag" is run in both cases?  The first
command didn't include the absolute file name of the program, could it
be that cmdproxy found some other copy of it?