Is there anyway to send text to an iESS buffer which does not need to follow (inferior-ess-send-input)?
I basically do this:
(process-send-string "R" "mycommand()")
(select-window (get-buffer-window "*R*"))
(inferior-ess-send-input)
The concern is that like this it ends up with some added characters to that buffer, looking like this:
>
>
Is there a cleaner way to have Emacs interact with the ESS/R process?
I want to use this to create some parallel processing within R being handled by Emacs.
">" is the prompt and is printed by R each time you send something to the process. If you want to avoid that use ess-command instead. You can supply custom buffer for the output.
Parallel processing with emacs is probably not a good idea. Better use R to span multiple R subprocesses.
Related
I am attempting to design a front end GUI for a CLI program by the name of eac3to.exe. The problem as I see it is that this program sends all of it's output to a cmd window. This is giving me no end of trouble because I need to get a lot of this output into a GUI window. This sounds easy enough, but I am begining to wonder whether I have found one of AutoIt's limitations?
I can use the Run() function with a windows internal command such as Dir and then get the output into a variable with the AutoIt StdoutRead() function, but I just can't get the output from an external program such as eac3to.exe - it just doesn't seem to work whatever I do! Just for testing purposesI I don't even need to get the output to a a GUI window: just printing it with ConsoleWrite() is good enough as this proves that I was able to read it into a variable. So at this stage that's all I need to do - get the text (usually about 10 lines) that has been output to a cmd window by my external CLI program into a variable. Once I can do this the rest will be a lot easier. This is what I have been trying, but it never works:
Global $iPID = Run("C:\VIDEO_EDITING\eac3to\eac3to.exe","", #SW_SHOW)
Global $ScreenOutput = StdoutRead($iPID)
ConsoleWrite($ScreenOutput & #CRLF)
After running this script all I get from the consolWrite() is a blank line - not the text data that was output as a result of running eac3to.exe (running eac3to without any arguments just lists a screen of help text relating to all the commandline options), and that's what I am trying to get into a variable so that I can put it to use later in the program.
Before I suggest a solution let me just tell you that Autoit has one
of the best help files out there. Use it.
You are missing $STDOUT_CHILD = Provide a handle to the child's STDOUT stream.
Also, you can't just do RUN and immediately call stdoutRead. At what point did you give the app some time to do anything and actually print something back to the console?
You need to either use ProcessWaitClose and read the stream then or, you should read the stream in a loop. Simplest check would be to set a sleep between RUN and READ and see what happens.
#include <AutoItConstants.au3>
Global $iPID = Run("C:\VIDEO_EDITING\eac3to\eac3to.exe","", #SW_SHOW, $STDOUT_CHILD)
; Wait until the process has closed using the PID returned by Run.
ProcessWaitClose($iPID)
; Read the Stdout stream of the PID returned by Run. This can also be done in a while loop. Look at the example for StderrRead.
; If the proccess doesnt end when finished you need to put this inside of a loop.
Local $ScreenOutput = StdoutRead($iPID)
ConsoleWrite($ScreenOutput & #CRLF)
Blasphemy I know to ask IF it is possible to do something in R, but here I am!
I am interested in the ability to create a function that will place code into the console. In other words, if the user types in f("3+3") and hits enter then the console will be waiting for the next command with > 3+3. Then when the user hits enter, it will return 6 in this case. Possible? Any ideas?
I wish I had more to share but I've never even thought this functionality would be useful before...
One way you could do this is to call system2() to invoke an external utility that synthesizes keyboard input. I've written a C++ program called sendkeys that can do this on Windows by (ultimately) calling SendInput(). Demo:
system2('sendkeys','3\\\\+3');
3+3
## [1] 6
(The backslash escaping is necessary because of the way my utility parses its input; + is a metachar that must be escaped to become literal.)
Let me know if you want my C++ code.
Would that be the kind of function you would need? Maybe it is not a very elegant solution, though.
printEval <- function(x){
cat(">", x,"\n")
cat ("Press [enter] to continue")
line <- readline()
eval(parse(text=x))
}
EDIT: Sorry, I just noticed that the eval(parse()) solution was already suggest by #Ping in the comment field right under the question.
Seems that there is no standard functions to get used/free/total of Disk space in Common Lisp.
There is statvfs.h in Linux/Mac and GetDiskFreeSpaceEx function in Windows for C/C++.
Personally, it would call an executable to do that using a library.
Calling df -h with IOLib for example.
But this is not portable (particularly IOLib, but there are other libraries), and you have to parse the output of the commands.
That's one reason I love programs which have "machine readable" outputs: you can glue them up programmatically (à la shell script).
Another way would be to actually call these c function, using cffi or uffi (ffi standing for foreign function interface), but I haven't used neither, so I can't say much about it.
Oh, search on quickdocs.org, there is probably a library exactly for that, or maybe just to access the OS's API.
I wrote a new project cl-diskspace using statvfs to get disk total/free/available space in Common Lisp. Support Mac/Linux/Windows.
Update: 2015-07-11 now support Windows! Thanks to pjb, Guthur, Fare, |3b|
Install cl-diskspace with QuickLisp:
$ git clone https://github.com/muyinliu/cl-diskspace.git
$ cp -r cl-diskspace ~/quicklisp/local-projects/
Load cl-diskspace with QuickLisp:
(ql:quickload 'cl-diskspace)
Usage of cl-diskspace:
Get disk space information
(diskspace:disk-space "/")
Will get something like this:
127175917568
16509661184
16247517184
Means that the total space is 118.44G, free space is 15.38G and available space is 15.13G
Get disk total space
(diskspace:disk-total-space "/")
Will get something like this:
127175917568
Get disk free space
(diskspace:disk-free-space "/")
Will get something like this:
16509661184
Get disk available space
(diskspace:disk-available-space "/")
Will get something like this:
16247517184
The R interactive interface implements the shell-like read line behavior (I have no better words to formulate this...).
For example, pressing Ctrl-W kills the preceding word.
Now, I would like this mechanism to stop at characters other than alphanumeric. For example, if I have entered
data.frame(Ant
and press Ctrl-W, the whole string data.frame(Ant is killed. I would much prefer the Ctrl-W to kill the Ant and stop short of the left parenthesis.
Is there a way of tweaking this behavior?
The behaviour of readline depends upon the operating system and the IDE. On Windows, CRTL-W doesn't delete the previous word. I don't think that there's a trivial way of changing the behaviour. At a guess, start digging around in:
http://svn.r-project.org/R/trunk/src/library/utils/src/io.c
Is there any way to create a unix FIFO with Go language? There is no Mkfifo, nor Mknod in os package, though I expected named FIFOs are largely used in posix OS's. In fact, there is a function for creating an unnamed FIFO (pipe), but no function for creating named pipes.
Am I the only one who needs them?
In order to get it to work on Linux, I simply did a
syscall.Mknod(fullPath, syscall.S_IFIFO|0666, 0)
It seemed to do the trick.
Here is a reference for the underlying mknod() call
There is a Mkfifo, but it's in the syscall-package :)
Searching through the source gives me the feeling it's not available on anything but OS X and FreeBSD though: http://www.google.com/codesearch#search&q=Mkfifo+package:http://go%5C.googlecode%5C.com
I don't have a unix machine ready to test with. You can use cgo if you like to build a C-interface package which exports it for you.