has someone experience in configuring urxvt? I'm trying to figure out how to remap shift-page_up/down to control-shift-page_up/down. I figured out how to use eval perl script's scroll_down_pages/scroll_up_pages functions for that which works but beside the fact that scroll_down_pages functions isn't properly implemented and needs to be patched I do not want to use perl for such simple operations. Any ideas how to do it correctly?
my keybindings
! Keybindings
URxvt.keysym.Shift-Control-C: eval:selection_to_clipboard
URxvt.keysym.Shift-Control-V: eval:paste_clipboard
URxvt.keysym.Shift-Up: command:\033]720;1\007
URxvt.keysym.Shift-Down: command:\033]721;1\007
URxvt.keysym.Shift-Control-Up: eval:scroll_up_pages 1
URxvt.keysym.Shift-Control-Down: eval:scroll_down_pages 1
!Rxvt.keysym.Shift-Control-Up: command:\033[5~ <- some of my failed attempts
!Rxvt.keysym.Shift-Control-Down: command:\033[6~ <- some of my failed attempts
URxvt.iso14755: False
I cannot use 'command:\033]721;n\007' instead because n should be equal to the size of the viewable area which is not known a priory
Related
Is it possible to get the operating system in maxima? I have some code that needs the unix / or windows \ for path names. How can I find out which operating system the code is running in?
To give some context, I have the following code:
windows: false$
divider: "/"$
if (windows) then divider: "\\"$
initfile: concat(maxima_userdir, divider, "maxima-init.mac");
load(operatingsystem)$
dir: getcurrentdirectory();
if (substring(dir, slength(dir)) # divider) then dir: concat(dir, divider)$
repo: concat(dir, "$$$.mac")$
live: concat(dir, "live_packages", divider, "$$$.mac")$
with_stdout(initfile, printf(true, ""))$
with_stdout(initfile, printf(true, concat("file_search_maxima: append (file_search_maxima, [
~s,
~s
]);"), repo, live))$
Take a look at the output of build_info, specifically the field host (i.e. foo#host where foo : build_info()). See ? build_info for more information.
On my (Linux) system I get: x86_64-unknown-linux-gnu I think on MS Windows you'll get a string containing windows or at least win or maybe win32.
There may be other ways to figure out the system type so let me know if that doesn't work for you. Also it is possible that there is a global variable floating around which tells the path separator; I would have to look for that.
If you're not adverse to writing a little bit of Lisp code, another approach is to use the file and directory functions in Common Lisp, which are more extensive than in Maxima. See the section on filenames in the Common Lisp Hyperspec. I think maybe MERGE-PATHNAMES and/or MAKE-PATHNAME might be relevant.
So i got a new keyboard wit hG-keys. (hotkeys) And i'm not familiar with lua...
So could anybody give me a very simple command that sets my pc to sleep? please?
if gkey == 7 and mkey == 1 then
if event == "G_PRESSED" then
end
end
gkeys
so gkey is the key that is pressed, and mkey is the set it uses. i can have up to 54 differint scripts/macro's.
I want to know what i have to put after the last 'then' so my pc goes to sleep.
thx ahead
edit 1:
got this:
if gkey == 1 and mkey == 3 then
if event == "G_PRESSED" then
execute("rundll32.exe powrprof.dll,SetSuspendState 0,1,0");
end
end
error is: [string "LuaVM"]:40: attempt to call global 'execute'(a nil value)
and with os.execute i get this error:
[string "LuaVM"]:40: attempt to index global 'os'(a nil value)
final answer: not possible with gseries keyboard. use a shortcut
Given the reference to G-keys and the G_PRESSED in your code snippet, I am assuming you have one of the Logitech G-Series keyboards. These keyboards can be programmed so that certain keys run Lua scripts using a custom Lua 5.1 interpreter. The documentation is included with Logitech's Gaming Software program.
According to the documentation, only some of the standard library functions are supported: the string, math and table are available. However, the io, os and debug libraries are not available.
So I doubt you'll be able to make your PC go to sleep.
EDIT in response to OP edit: the Lua library you have access to has the os library removed, so you're probably not going to be able to make your computer sleep directly.
There might be an indirect way to do this by writing something that listens for debugging messages, which you can generate with OutputDebugMessage. There's a Team Speak plugin that does this. But it's probably beyond your programming ability right now and far beyond the scope of a Stackoverflow post to explain.
You can use os.execute to run an executable from Lua.
If you google "Windows sleep command line" you'll get another Stackoverflow post which shows two ways of doing it. One requires that you turn hibernation off, the other requires that you download an additional utility (PsShutdown).
Assuming you've downloaded PsShutdown and put it somewhere in your PATH, then you can use the following to sleep the computer:
os.execute('psshutdown -d -t 0')
In my Informix 4GL program, I have an input field where the user can insert a URL and the feed is later being sent over to the web via a script.
How can I validate the URL at the time of input, to ensure that it's a live link? Can I make a call and see if I get back any errors?
I4GL checking the URL
There is no built-in function to do that (URLs didn't exist when I4GL was invented, amongst other things).
If you can devise a C method to do that, you can arrange to call that method through the C interface. You'll write the method in native C, and then write an I4GL-callable C interface function using the normal rules. When you build the program with I4GL c-code, you'll link the extra C functions too. If you build the program with I4GL-RDS (p-code), you'll need to build a custom runner with the extra function(s) exposed. All of this is standard technique for I4GL.
In general terms, the C interface code you'll need will look vaguely like this:
#include <fglsys.h>
// Standard interface for I4GL-callable C functions
extern int i4gl_validate_url(int nargs);
// Using obsolescent interface functions
int i4gl_validate_url(int nargs)
{
if (nargs != 1)
fgl_fatal(__FILE__, __LINE__, -1318);
char url[4096];
popstring(url, sizeof(url));
int r = validate_url(url); // Your C function
retint(r);
return 1;
}
You can and should check the manuals but that code, using the 'old style' function names, should compile correctly. The code can be called in I4GL like this:
DEFINE url CHAR(256)
DEFINE rc INTEGER
LET url = "http://www.google.com/"
LET rc = i4gl_validate_url(url)
IF rc != 0 THEN
ERROR "Invalid URL"
ELSE
MESSAGE "URL is OK"
END IF
Or along those general lines. Exactly what values you return depends on your decisions about how to return a status from validate_url(). If need so be, you can return multiple values from the interface function (e.g. error number and text of error message). Etc. This is about the simplest possible design for calling some C code to validate a URL from within an I4GL program.
Modern C interface functions
The function names in the interface library were all changed in the mid-00's, though the old names still exist as macros. The old names were:
popstring(char *buffer, int buflen)
retint(int retval)
fgl_fatal(const char *file, int line, int errnum)
You can find the revised documentation at IBM Informix 4GL v7.50.xC3: Publication library in PDF in the 4GL Reference Manual, and you need Appendix C "Using C with IBM Informix 4GL".
The new names start ibm_lib4gl_:
ibm_libi4gl_popMInt()
ibm_libi4gl_popString()
As to the error reporting function, there is one — it exists — but I don't have access to documentation for it any more. It'll be in the fglsys.h header. It takes an error number as one argument; there's the file name and a line number as the other arguments. And it will, presumably, be ibm_lib4gl_… and there'll be probably be Fatal or perhaps fatal (or maybe Err or err) in the rest of the name.
I4GL running a script that checks the URL
Wouldn't it be easier to write a shell script to get the status code? That might work if I can return the status code or any existing results back to the program into a variable? Can I do that?
Quite possibly. If you want the contents of the URL as a string, though, you'll might end up wanting to call C. It is certainly worth thinking about whether calling a shell script from within I4GL is doable. If so, it will be a lot simpler (RUN "script", IIRC, where the literal string would probably be replaced by a built-up string containing the command and the URL). I believe there are file I/O functions in I4GL now, too, so if you can get the script to write a file (trivial), you can read the data from the file without needing custom C. For a long time, you needed custom C to do that.
I just need to validate the URL before storing it into the database. I was thinking about:
#!/bin/bash
read -p "URL to check: " url
if curl --output /dev/null --silent --head --fail "$url"; then
printf '%s\n' "$url exist"
else
printf '%s\n' "$url does not exist"
fi
but I just need the output instead of /dev/null to be into a variable. I believe the only option is to dump the output into a temp file and read from there.
Instead of having I4GL run the code to validate the URL, have I4GL run a script to validate the URL. Use the exit status of the script and dump the output of curl into /dev/null.
FUNCTION check_url(url)
DEFINE url VARCHAR(255)
DEFINE command_line VARCHAR(255)
DEFINE exit_status INTEGER
LET command_line = "check_url ", url
RUN command_line RETURNING exit_status
RETURN exit_status
END FUNCTION {check_url}
Your calling code can analyze exit_status to see whether it worked. A value of 0 indicates success; non-zero indicates a problem of some sort, which can be deemed 'URL does not work'.
Make sure the check_url script (a) exits with status zero on success and non-zero on any sort of failure, and (b) doesn't write anything to standard output (or standard error) by default. The writing to standard error or output will screw up screen layouts, etc, and you do not want that. (You can obviously have options to the script that enable standard output, or you can invoke the script with options to suppress standard output and standard error, or redirect the outputs to /dev/null; however, when used by the I4GL program, it should be silent.)
Your 'script' (check_url) could be as simple as:
#!/bin/bash
exec curl --output /dev/null --silent --head --fail "${1:-http://www.example.com/"
This passes the first argument to curl, or the non-existent example.com URL if no argument is given, and replaces itself with curl, which generates a zero/non-zero exit status as required. You might add 2>/dev/null to the end of the command line to ensure that error messages are not seen. (Note that it will be hell debugging this if anything goes wrong; make sure you've got provision for debugging.)
The exec is a minor optimization; you could omit it with almost no difference in result. (I could devise a scheme that would probably spot the difference; it involves signalling the curl process, though — kill -9 9999 or similar, where the 9999 is the PID of the curl process — and isn't of practical significance.)
Given that the script is just one line of code that invokes another program, it would be possible to embed all that in the I4GL program. However, having an external shell script (or Perl script, or …) has merits of flexibility; you can edit it to log attempts, for example, without changing the I4GL code at all. One more file to distribute, but better flexibility — keep a separate script, even though it could all be embedded in the I4GL.
As Jonathan said "URLs didn't exist when I4GL was invented, amongst other things". What you will find is that the products that have grown to superceed Informix-4gl such as FourJs Genero will cater for new technologies and other things invented after I4GL.
Using FourJs Genero, the code below will do what you are after using the Informix 4gl syntax you are familiar with
IMPORT com
MAIN
-- Should succeed and display 1
DISPLAY validate_url("http://www.google.com")
DISPLAY validate_url("http://www.4js.com/online_documentation/fjs-fgl-manual-html/index.html#c_fgl_nf.html") -- link to some of the features added to I4GL by Genero
-- Should fail and display 0
DISPLAY validate_url("http://www.google.com/testing")
DISPLAY validate_url("http://www.google2.com")
END MAIN
FUNCTION validate_url(url)
DEFINE url STRING
DEFINE req com.HttpRequest
DEFINE resp com.HttpResponse
-- Returns TRUE if http request to a URL returns 200
TRY
LET req = com.HttpRequest.create(url)
CALL req.doRequest()
LET resp = req.getResponse()
IF resp.getStatusCode() = 200 THEN
RETURN TRUE
END IF
-- May want to handle other HTTP status codes
CATCH
-- May want to capture case if not connected to internet etc
END TRY
RETURN FALSE
END FUNCTION
How can I limit the output to the F# Interactive console to my own output?
In my current setup the fsi writes lots of information (on types and content of the data structures) as it runs through the script.
I have tried the quiet mode without success.
Thanks!
You can set ShowDeclarationValues, ShowProperties, and ShowIEnumerable to false.
You may still see types, but not content (which is generally the bulk of the output).
#if INTERACTIVE
fsi.ShowDeclarationValues <- false
fsi.ShowProperties <- false
fsi.ShowIEnumerable <- false
#endif
Another unconventional method might be the following:
fire your FSI with --quiet option
instead of printf use eprintf for your own output, the effect would be exactly what you asked for
in the script
eprintfn "Testing: %n" 123
in FSI window
Testing: 123
Any other, but real error messages output simply will not appear in the FSI window, including all evaluation results; at the same time all conveniences of printf are still available to you, including familiar formatting.
UPDATE: I posted a further enhancement allowing use of unchanged output code for both normal and "quiet" modes of FSI output.
Starting here - Embedding F# interactive - I've been trying to embed FSI in my application.
However, I'm getting weird stuff back from StandardOutput.
for example, in standard FSI, if I send this:
let a = 3;;
I get this back:
[empty line here]
val a : int = 3
[empty line here]
> |
(with Pipe representing the input position)
But if I send let a = 3;; to StandardInput, I get this back on StandardOutput:
>
val a : int = 3
|
Has anyone else tried this? Is there something I'm doing wrong, and if not is there any way to work around this? None of the things I've tried so far work, and before I try the 'worse' thing I can think of (set a timer after sending stuff, add the > myself on timeout), I'd like to know if there is a better way!
When embedding F# Interactive, Visual Studio uses the --fsi-server:<some value> parameter.
As far as I know, this does two things:
Changes the way output is printed (instead of printing >, it prints SERVER-PROMPT> on a separate line, so it should be easier to remove it from the output and detect state when input is expected)
It also starts some .NET Remoting channel that you can use to stop execution of commands in F# Interactive (e.g. if it runs into an infinite loop) and it can also provide some completion information.
The F# Interactive pad in MonoDevelop F# plugin uses the flag (see source code on GitHub). I think it works mostly right, but I believe it sometimes prints additional \n in the output.