Re: Is HibernateD dead?
On Thursday, 3 May 2018 at 23:05:02 UTC, Matthias Klumpp wrote:
On Thursday, 3 May 2018 at 21:28:18 UTC, bauss wrote:
On Thursday, 3 May 2018 at 18:01:07 UTC, Matthias Klumpp wrote:
DiamondMVC looks nice, but I would need PostgreSQL support
for sure.
Therefore, I think there are three options:
1) Extend the DiamondMVC ORM to support missing features
that Hibernated has (maybe make it use ddbc as backend?)
2) Revive Hibernated - contacting Vadim Lopatin would be key
for that, and maybe the project could be maintained in the
dlang-community organization (although there are competing
projects for it...)
3) Find a different D ORM that does the job and expand it to
include missing features.
Yes, I completely agree with PostgreSQL support. It's really
important to me getting that working, as well MSSQL. I was
hoping I could find time this weekend to actually do that.
Would it maybe be easier for you to base on ddbc[1] or another
existing abstraction layer for database abstraction?
Ddbc is pretty neat, and even has support for reading structs
directly from the database.
Perhaps, but it'd have to be a forked version as I don't really
want to depend on something that isn't updated regularly.
ddbc's last commit was a year ago.
I can't seem to find a license for it though?
[1]: https://github.com/buggins/ddbc
Perhaps I will end up having another "optional" dependency to
it as a temporary until I can have a better implementation or
something.
The frontend part of postgresql is almost finished, it's just
having the postgresql driver working properly, which is where
it's frozen right now.
Hmm... Does any public code for that exist already that I could
play around with?
Unfortunately, I have a few more unusual requirements for
Postgres, like:
* UUIDs as primary keys, instead of integers
As far as I remember the implementation of @DbId in Diamond, then
it supports whatever type.
Diamond doesn't care much about what type your primary key is.
I will make sure that's how it function of course, if it
currently doesn't behave like it, but I'm pretty sure it does.
* Ability to register custom datatypes with the ORM (version
numbers in this case, the ORM can view them as text, but the
database has a special type for them)
That could be done with some attribute that lets you handle
columns yourself.
Do you have a good name for it?
I was thinking @DbProxy and then the function would be something
like:
@DbProxy(functionName) string field;
...
auto functionName(RawDbType type)
{
return the new datatype that matches the field with the
@DbProxy attribute.
}
* Obviously the usual ORM stuff, one-to-many, many-to-many,
etc. relations
Yes, relations is one thing I haven't added and I have been
wanting to do it for a while.
I will definitely look into having it added as well.
(Obviously not a must-have list, I added support for custom
datatypes to my ddbc fork as well, because it's not really a
feature many people need)
Well, that's kind of the key to most of the development in
Diamond.
I usually add functionality that isn't widely used and in most
cases people implement it themselves ex. the whole diamond.seo is
not usually something a framework has.
Diamond is a neat project, I played around with it about half a
year ago, but didn't test the ORM part at all back then.
It wasn't that good back then and has improved a lot since, as
well many other parts of Diamond. Over the past half year it has
grown rapidly, both in stability and functionality.
C++ / const class pointer signature / unable to find correct D syntax
I have a static C++ and can't make it to get a correct binding for one function: DMD: public: unsigned int __cdecl b2d::Context2D::_begin(class b2d::Image & __ptr64,class b2d::Context2D::InitParams const * __ptr64 const) __ptr64 LIB: public: unsigned int __cdecl b2d::Context2D::_begin(class b2d::Image & __ptr64,class b2d::Context2D::InitParams const * __ptr64) __ptr64 So I somehow get some more const from D. This is the code I used: final uint _begin(ref Image image, const(InitParams) initParams); Which creates a const pointer to a const class signature. But it should only be a const pointer. Any idea how to solve this? -- Robert M. Münch http://www.saphirion.com smarter | better | faster
Re: C++ / const class pointer signature / unable to find correct D syntax
On Friday, 4 May 2018 at 07:49:02 UTC, Robert M. Münch wrote:
I have a static C++ and can't make it to get a correct binding
for one function:
DMD: public: unsigned int __cdecl b2d::Context2D::_begin(class
b2d::Image & __ptr64,class b2d::Context2D::InitParams const *
__ptr64 const) __ptr64
LIB: public: unsigned int __cdecl b2d::Context2D::_begin(class
b2d::Image & __ptr64,class b2d::Context2D::InitParams const *
__ptr64) __ptr64
So I somehow get some more const from D. This is the code I
used:
final uint _begin(ref Image image, const(InitParams)
initParams);
Which creates a const pointer to a const class signature. But
it should only be a const pointer. Any idea how to solve this?
The problem is that const in D is transitive. That means T *
const from C++ is not expressible in D. Any reference through a
const becomes const. To use it, IMO your best bet is to make a
wrapper function on the C++ side like this:
unsigned int __cdecl b2d::Context2D::_begin(class b2d::Image &
im,class b2d::Context2D::InitParams const * const InitParams)
{
return //the call to the original c++ function
}
Alternatively you can use dpp, or dstep or some similar tool to
try and let the tool create bindings. As a last ditch, you can
force the mangle to match by using pragma(mangle, ...) like this:
pragma(mangle, _ZactualMangleFromC++Compiler)
final uint _begin(ref Image image, const(InitParams) initParams);
Re: Windows to Linux Porting
On Fri, 2018-05-04 at 03:30 +, Vino via Digitalmars-d-learn wrote:
> Hi All,
>
>Request you help on the below code, the below code always state
> the file does not exist even if the file do exist.
>
> Code:
>
> import core.stdc.stdlib: exit;
> import std.stdio;
> import std.file;
> import std.path;
>
> auto osSwitch () {
> string ConfigFile;
> version (Windows) { ConfigFile = absolutePath(`.\nasconfig.txt`);
`./nasconfig.txt`
perhaps: Linux uses / (as does Windows in fact) for directory separator.
> } else version (Linux) { ConfigFile =
> absolutePath(`nasconfig.txt`); }
> return ConfigFile;
> }
> void main () {
> auto ConfigFile = osSwitch;
> if (!ConfigFile.exists) { writeln("The Configuration File ",
> buildNormalizedPath(ConfigFile), " do to exist, Terminating the
> execution.."); exit(-1);}
> else { writeln(ConfigFile); }
> }
>
> From,
> Vino.B
>
--
Russel.
==
Dr Russel Winder t: +44 20 7585 2200
41 Buckmaster Roadm: +44 7770 465 077
London SW11 1EN, UK w: www.russel.org.uk
signature.asc
Description: This is a digitally signed message part
Re: Windows to Linux Porting
On Friday, 4 May 2018 at 07:43:39 UTC, Russel Winder wrote: On Fri, 2018-05-04 at 03:30 +, Vino via Digitalmars-d-learn wrote: [...] `./nasconfig.txt` perhaps: Linux uses / (as does Windows in fact) for directory separator. [...] Hi Russel, Was able to resolve the issue, the issue was the letter "L" in version (Linux) where is should be version (linux). From, Vino.B
Re: Windows to Linux Porting
On Fri, 2018-05-04 at 08:47 +, Vino via Digitalmars-d-learn wrote: > […] > Was able to resolve the issue, the issue was the letter "L" in > version (Linux) where is should be version (linux). It would have helped if I had read the code first rather than jumped to a conclusion. :-) -- Russel. == Dr Russel Winder t: +44 20 7585 2200 41 Buckmaster Roadm: +44 7770 465 077 London SW11 1EN, UK w: www.russel.org.uk signature.asc Description: This is a digitally signed message part
could someone test support for Asian languages in nanogui port?
I port nanogui, but besides porting I'd like to improve it using great capabilities of D language provides. One of them is utf support, so I added support for Asian languages to nanogui.TextBox. But I'm not sure I've did it well and so I'd like to ask someone to test it using the following: ``` git clone --recursive https://github.com/drug007/nanogui.git cd nanogui git checkout textbox # TextBox exists in this branch only dub --config=sdl # Keyboard events provided only by SDL2 backend only ``` On the right side there will be a window with four text boxes with russian, english, japanese and chinese text respectively. It would be nice to get some feedback from users - probably I did something totally wrong. Also I'm curious does it worth efforts?
Re: Windows to Linux Porting
On Friday, 4 May 2018 at 09:25:28 UTC, Russel Winder wrote: On Fri, 2018-05-04 at 08:47 +, Vino via Digitalmars-d-learn wrote: […] Was able to resolve the issue, the issue was the letter "L" in version (Linux) where is should be version (linux). It would have helped if I had read the code first rather than jumped to a conclusion. :-) Hi Russel, No issue, and thank you for your help. From, Vino.B
Windows to Linux Porting - timeCreated and timeLastAccessed
Hi All,
Request your help, I have a D program written on Windows
platform and the program is working as expected, now i am trying
to port the same program to Linux, my program use the function
"timeCreated" from std.file for Windows hugely where as in Linux
we do not have the same function hence planned to use the
function "timeLastAccessed" from std.file, so what is the best
approach to port the program. I tried the below code but not
working, so can you one please guide me on the right method to
port the program to linux, below is the example code.
Example Code:
import std.stdio: writeln;
import std.container.array;
import std.file: dirEntries,isFile, SpanMode;
import std.algorithm: filter, map;
import std.typecons: Tuple, tuple;
import std.datetime.systime: SysTime;
version (Windows) { alias sTimeStamp = timeCreated; } else
version (linux) { alias sTimeStamp = timeLastAccessed; }
auto clogClean (string LogDir ) {
Array!(Tuple!(string, SysTime)) dFiles;
dFiles.insert(dirEntries(LogDir, SpanMode.shallow).filter!(a =>
a.isFile).map!(a => tuple(a.name, a.sTimeStamp)));
return dFiles;
}
void main () {
string LogDir;
LogDir = "//DScript/Test"; // Error: undefined identifier
timeLastAccessed on Linux
LogDir = "C:\\DScript\\Others"; // Error: undefined identifier
timeCreated on Windows.
writeln(clogClean(LogDir));
}
From,
Vino.B
Re: Windows to Linux Porting - timeCreated and timeLastAccessed
What are you actually trying to do with it? These functions are probably the wholly wrong approach.
Re: Windows to Linux Porting
On Friday, May 04, 2018 10:25:28 Russel Winder via Digitalmars-d-learn wrote: > On Fri, 2018-05-04 at 08:47 +, Vino via Digitalmars-d-learn wrote: > > […] > > > Was able to resolve the issue, the issue was the letter "L" in > > > > version (Linux) where is should be version (linux). > > It would have helped if I had read the code first rather than jumped to a > conclusion. > > :-) It happens to us all from time to time, and the casing of the version identifiers can be easy to screw up and easy to miss the mistakes - especially since many of them are based on the names that get used with #ifdef in C/C++ rather than having consistent casing across the various version identifiers. - Jonathan M Davis
using Unsized Arrays in Structures from d?
Hi,
How can I use the following c structure from d.
struct Item
{
int id;
};
struct Group
{
int i;
int item_count;
struct Item items[];
};
tried defining items[] as both "Item[] items" and "Item* items"
in d, it compiles okay but gives an error when trying to access
it.
Here is the error.
object.Error@(0): Access Violation
0x00BCA9D1
0x00BC104C
0x00BD01EB
0x00BD0169
0x00BD
0x00BCA827
0x74118654 in BaseThreadInitThunk
0x77534B17 in RtlGetAppContainerNamedObjectPath
0x77534AE7 in RtlGetAppContainerNamedObjectPath
Regards,
NewUser
Re: Windows to Linux Porting - timeCreated and timeLastAccessed
On Friday, 4 May 2018 at 12:38:07 UTC, Adam D. Ruppe wrote: What are you actually trying to do with it? These functions are probably the wholly wrong approach. Hi Adam, The existing program in Windows do few task's eg: Delete files older that certain days, and now we are trying to port to Linux, and above was just a example, hence asked the right approach for porting. From, Vino.B
Re: using Unsized Arrays in Structures from d?
On Friday, 4 May 2018 at 13:02:08 UTC, NewUser wrote:
How can I use the following c structure from d.
struct Item
{
int id;
};
struct Group
{
int i;
int item_count;
struct Item items[];
};
tried defining items[] as both "Item[] items" and "Item* items"
in d, it compiles okay but gives an error when trying to access
it.
Here is the error.
object.Error@(0): Access Violation
The D equivalent is:
struct Item {
int id;
}
struct Group {
int i;
int item_count;
Item* items;
}
The error message you're getting makes me think items is null.
The lack of function names in the stack trace makes it kinda hard
to understand exactly what's happening - you can turn that on
with -g for DMD. Seeing some of the code that uses these structs
might also help.
--
Simen
Re: using Unsized Arrays in Structures from d?
On Friday, 4 May 2018 at 13:02:08 UTC, NewUser wrote:
tried defining items[] as both "Item[] items" and "Item* items"
in d, it compiles okay but gives an error when trying to access
it.
You were on the right track. D array notation is:
[] ;
For me this works:
```
struct Item
{
int id;
};
struct Group
{
int i;
int item_count;
Item[] items;
};
void main()
{
auto g = Group();
g.items ~= Item(3);
assert(g.items[0].id == 3);
}
```
Re: using Unsized Arrays in Structures from d?
On Friday, 4 May 2018 at 13:21:53 UTC, Timoses wrote:
On Friday, 4 May 2018 at 13:02:08 UTC, NewUser wrote:
tried defining items[] as both "Item[] items" and "Item*
items" in d, it compiles okay but gives an error when trying
to access it.
You were on the right track. D array notation is:
[] ;
For me this works:
```
struct Item
{
int id;
};
struct Group
{
int i;
int item_count;
Item[] items;
};
void main()
{
auto g = Group();
g.items ~= Item(3);
assert(g.items[0].id == 3);
}
```
Hi Timoses,
The structure is being returned from c and I'd like use it from d.
What you have work perfectly when assigning from d.
Regards,
NewUser
Re: How do you connect Python with D via socket, I'm still getting connection refused error
On Thursday, 3 May 2018 at 23:58:24 UTC, Enjoys Math wrote: Error - [...] Haven't run it, but two things to try... On D side try adding listen after bind. On python side. Don't think you need to call bind the client socket ( this may cause problems). Cheers, A.
Re: Windows to Linux Porting - timeCreated and timeLastAccessed
On Friday, May 04, 2018 13:17:36 Vino via Digitalmars-d-learn wrote: > On Friday, 4 May 2018 at 12:38:07 UTC, Adam D. Ruppe wrote: > > What are you actually trying to do with it? These functions are > > probably the wholly wrong approach. > > Hi Adam, > > The existing program in Windows do few task's eg: Delete files > older that certain days, and now we are trying to port to Linux, > and above was just a example, hence asked the right approach for > porting. Linux does not keep track of the creation time of a file. So, it will not work to have a program on Linux ask a file how long it's been since the file was created. If you want that information, you'll have to store it elsewhere somehow (and that generally only works if you created the file in the first place). The modification time of the file is the time that the file was last changed (which would be the creation time if it were only ever written to once, but in the general case, it has no relation to the creation time at all). So, you could use std.file.timeLastModified to find out if a file has been changed within the last x number of days, but there is no way to find out the creation time of a file by asking the filesystem. - Jonathan M Davis
Re: LDC phobos2-ldc.lib(json.obj) : fatal error LNK1112: module machine type 'x64' conflicts with target machine type 'x86'
On Thursday, 3 May 2018 at 23:47:40 UTC, IntegratedDimensions wrote: trying to compile a simple program in x86. Compiles fine in dmd and ldcx64. Seems like ldc is using the wrong lib for some reason? phobos2-ldc.lib(json.obj) : fatal error LNK1112: module machine type 'x64' conflicts with target machine type 'x86' To help, we need more details, such as what code are you compiling, what version of LDC, and what commandline. - Johan
Re: Coding Challenges at Dconf2018: Implement Needleman–Wunsch and Smith–Waterman algorithms
On Monday, 30 April 2018 at 18:47:21 UTC, biocyberman wrote: I am attending Dconf 2018 and giving a talk there on May 4. Link: https://dconf.org/2018/talks/le.html. It will be very interesting to talk about the outcome of the following challenges. If we can't have at least 3 solutions by three individuals by 10:00 GMT+2 May 4, I will have to postpone the deadline one week. Please see below for more details. Too bad this didn't go on announce. I'm looking forward to it. I'll try to send my solution if this is postponed.
Re: Windows to Linux Porting - timeCreated and timeLastAccessed
On Friday, 4 May 2018 at 14:02:24 UTC, Jonathan M Davis wrote:
On Friday, May 04, 2018 13:17:36 Vino via Digitalmars-d-learn
wrote:
On Friday, 4 May 2018 at 12:38:07 UTC, Adam D. Ruppe wrote:
> What are you actually trying to do with it? These functions
> are probably the wholly wrong approach.
Hi Adam,
The existing program in Windows do few task's eg: Delete
files
older that certain days, and now we are trying to port to
Linux,
and above was just a example, hence asked the right approach
for
porting.
Linux does not keep track of the creation time of a file. So,
it will not work to have a program on Linux ask a file how long
it's been since the file was created. If you want that
information, you'll have to store it elsewhere somehow (and
that generally only works if you created the file in the first
place).
The modification time of the file is the time that the file was
last changed (which would be the creation time if it were only
ever written to once, but in the general case, it has no
relation to the creation time at all). So, you could use
std.file.timeLastModified to find out if a file has been
changed within the last x number of days, but there is no way
to find out the creation time of a file by asking the
filesystem.
- Jonathan M Davis
Hi Jonathan,
Thank you, i got your point from the other forum topic which
was raised by me earlier, hence decided to use modification time,
the request is on how and the best approach to port the code from
windows to Linux eg program below
Example Code:
import std.stdio: writeln;
import std.container.array;
import std.file: dirEntries,isFile, SpanMode;
import std.algorithm: filter, map;
import std.typecons: Tuple, tuple;
import std.datetime.systime: SysTime;
version (Windows) { alias sTimeStamp = timeCreated; } else
version (linux) { alias sTimeStamp = timeLastAccessed; }
auto clogClean (string LogDir ) {
Array!(Tuple!(string, SysTime)) dFiles;
dFiles.insert(dirEntries(LogDir, SpanMode.shallow).filter!(a =>
a.isFile).map!(a => tuple(a.name, a.sTimeStamp)));
return dFiles;
}
void main () {
string LogDir;
LogDir = "//DScript/Test"; // Error: undefined identifier
timeLastAccessed on Linux
LogDir = "C:\\DScript\\Others"; // Error: undefined identifier
timeCreated on Windows.
writeln(clogClean(LogDir));
}
From,
Vino.B
Re: Coding Challenges at Dconf2018: Implement Needleman–Wunsch and Smith–Waterman algorithms
On Friday, 4 May 2018 at 14:13:19 UTC, Luís Marques wrote: On Monday, 30 April 2018 at 18:47:21 UTC, biocyberman wrote: I am attending Dconf 2018 and giving a talk there on May 4. Link: https://dconf.org/2018/talks/le.html. It will be very interesting to talk about the outcome of the following challenges. If we can't have at least 3 solutions by three individuals by 10:00 GMT+2 May 4, I will have to postpone the deadline one week. Please see below for more details. Too bad this didn't go on announce. I'm looking forward to it. I'll try to send my solution if this is postponed. Hi Louis, I will wait :)
Re: C++ / Wrong function signature generated for reference parameter
On Thursday, 3 May 2018 at 11:29:59 UTC, Robert M. Münch wrote: Not sure I understand this too. This is now what I get: DMD: public: unsigned int __cdecl b2d::Context2D::_begin(class b2d::Image & __ptr64,class b2d::Context2D::InitParams const * __ptr64 const) __ptr64 LIB: public: unsigned int __cdecl b2d::Context2D::_begin(class b2d::Image & __ptr64,class b2d::Context2D::InitParams const * __ptr64) __ptr64 So I somehow get some more const from D. This is the code I used: final uint _begin(ref Image image, const(InitParams) initParams); Any idea how to solve this? I really like that I'm able to use C++ stuff from D but interfacing the tow is a bit tedious... it would be great to be able to write the C++ signature in the extern(C++) scope and have it translated to the D equivalent internally. Just as a note: Related (if not to say duplicate) topic: https://forum.dlang.org/post/pch39e$nt7$1...@digitalmars.com
Re: LDC phobos2-ldc.lib(json.obj) : fatal error LNK1112: module machine type 'x64' conflicts with target machine type 'x86'
On Thursday, 3 May 2018 at 23:47:40 UTC, IntegratedDimensions wrote: Maybe this is a cross compilation issue? Looks like you simply didn't download the LDC multilib package.
Re: using Unsized Arrays in Structures from d?
On Friday, 4 May 2018 at 13:27:03 UTC, NewUser wrote: Hi Timoses, The structure is being returned from c and I'd like use it from d. What you have work perfectly when assigning from d. Regards, NewUser Then you probably need some `extern(C)` statement introducing the C function and the struct type, right? You could also try dstep to "translate" the C header file to D: https://github.com/jacob-carlborg/dstep
Re: Windows to Linux Porting - timeCreated and timeLastAccessed
On Friday, 4 May 2018 at 14:24:36 UTC, Vino wrote:
On Friday, 4 May 2018 at 14:02:24 UTC, Jonathan M Davis wrote:
On Friday, May 04, 2018 13:17:36 Vino via Digitalmars-d-learn
wrote:
On Friday, 4 May 2018 at 12:38:07 UTC, Adam D. Ruppe wrote:
> What are you actually trying to do with it? These functions
> are probably the wholly wrong approach.
Hi Adam,
The existing program in Windows do few task's eg: Delete
files
older that certain days, and now we are trying to port to
Linux,
and above was just a example, hence asked the right approach
for
porting.
Linux does not keep track of the creation time of a file. So,
it will not work to have a program on Linux ask a file how
long it's been since the file was created. If you want that
information, you'll have to store it elsewhere somehow (and
that generally only works if you created the file in the first
place).
The modification time of the file is the time that the file
was last changed (which would be the creation time if it were
only ever written to once, but in the general case, it has no
relation to the creation time at all). So, you could use
std.file.timeLastModified to find out if a file has been
changed within the last x number of days, but there is no way
to find out the creation time of a file by asking the
filesystem.
- Jonathan M Davis
Hi Jonathan,
Thank you, i got your point from the other forum topic which
was raised by me earlier, hence decided to use modification
time, the request is on how and the best approach to port the
code from windows to Linux eg program below
Example Code:
import std.stdio: writeln;
import std.container.array;
import std.file: dirEntries,isFile, SpanMode;
import std.algorithm: filter, map;
import std.typecons: Tuple, tuple;
import std.datetime.systime: SysTime;
version (Windows) { alias sTimeStamp = timeCreated; } else
version (linux) { alias sTimeStamp = timeLastAccessed; }
auto clogClean (string LogDir ) {
Array!(Tuple!(string, SysTime)) dFiles;
dFiles.insert(dirEntries(LogDir, SpanMode.shallow).filter!(a
=> a.isFile).map!(a => tuple(a.name, a.sTimeStamp)));
return dFiles;
}
void main () {
string LogDir;
LogDir = "//DScript/Test"; // Error: undefined
identifier timeLastAccessed on Linux
LogDir = "C:\\DScript\\Others"; // Error: undefined
identifier timeCreated on Windows.
writeln(clogClean(LogDir));
}
From,
Vino.B
Unlike NTFS for Windows there's a plethora of different file
systems available to use for Linux, one of which doesn't even
support deletion of files. You also have to keep in mind that
even if the same file system is used, there is no guarantee that
you have the same set of metadata available for a mount point
each and every time.
Consider a file system that's mounted with the 'noatime' option,
for instance, which doesn't log access times.
As far as I understand you are globing files, check times and
then act upon that.
If I were to port this to Linux, or any other OS for that matter,
I wouldn't depend on a feature of an OS.
Instead, since you have to look at a file either way to get the
meta data (which you query with the stat family of functions), I
would build my own database or cache with that information.
Glob the directory and add files not yet present with the current
date (and any other meta data you might need).
Then query all the files of interest and do whatever you want to
do with them and remove the entry.
Downside is you have possibly another dependency. On the plus
side you could easily query all files older than X days or
whatever with a single select and batch process them.
Re: using Unsized Arrays in Structures from d?
On Friday, 4 May 2018 at 14:55:18 UTC, Timoses wrote: On Friday, 4 May 2018 at 13:27:03 UTC, NewUser wrote: Hi Timoses, The structure is being returned from c and I'd like use it from d. What you have work perfectly when assigning from d. Regards, NewUser Then you probably need some `extern(C)` statement introducing the C function and the struct type, right? You could also try dstep to "translate" the C header file to D: https://github.com/jacob-carlborg/dstep Hi Timoses, Thanks for the suggestion, i'll try it out. Regards, NewUser
Re: Windows to Linux Porting - timeCreated and timeLastAccessed
On Friday, 4 May 2018 at 15:16:23 UTC, wjoe wrote:
On Friday, 4 May 2018 at 14:24:36 UTC, Vino wrote:
On Friday, 4 May 2018 at 14:02:24 UTC, Jonathan M Davis wrote:
On Friday, May 04, 2018 13:17:36 Vino via Digitalmars-d-learn
wrote:
[...]
Linux does not keep track of the creation time of a file. So,
it will not work to have a program on Linux ask a file how
long it's been since the file was created. If you want that
information, you'll have to store it elsewhere somehow (and
that generally only works if you created the file in the
first place).
The modification time of the file is the time that the file
was last changed (which would be the creation time if it were
only ever written to once, but in the general case, it has no
relation to the creation time at all). So, you could use
std.file.timeLastModified to find out if a file has been
changed within the last x number of days, but there is no way
to find out the creation time of a file by asking the
filesystem.
- Jonathan M Davis
Hi Jonathan,
Thank you, i got your point from the other forum topic
which was raised by me earlier, hence decided to use
modification time, the request is on how and the best approach
to port the code from windows to Linux eg program below
Example Code:
import std.stdio: writeln;
import std.container.array;
import std.file: dirEntries,isFile, SpanMode;
import std.algorithm: filter, map;
import std.typecons: Tuple, tuple;
import std.datetime.systime: SysTime;
version (Windows) { alias sTimeStamp = timeCreated; } else
version (linux) { alias sTimeStamp = timeLastAccessed; }
auto clogClean (string LogDir ) {
Array!(Tuple!(string, SysTime)) dFiles;
dFiles.insert(dirEntries(LogDir, SpanMode.shallow).filter!(a
=> a.isFile).map!(a => tuple(a.name, a.sTimeStamp)));
return dFiles;
}
void main () {
string LogDir;
LogDir = "//DScript/Test"; // Error: undefined
identifier timeLastAccessed on Linux
LogDir = "C:\\DScript\\Others"; // Error: undefined
identifier timeCreated on Windows.
writeln(clogClean(LogDir));
}
From,
Vino.B
Unlike NTFS for Windows there's a plethora of different file
systems available to use for Linux, one of which doesn't even
support deletion of files. You also have to keep in mind that
even if the same file system is used, there is no guarantee
that you have the same set of metadata available for a mount
point each and every time.
Consider a file system that's mounted with the 'noatime'
option, for instance, which doesn't log access times.
As far as I understand you are globing files, check times and
then act upon that.
If I were to port this to Linux, or any other OS for that
matter, I wouldn't depend on a feature of an OS.
Instead, since you have to look at a file either way to get the
meta data (which you query with the stat family of functions),
I would build my own database or cache with that information.
Glob the directory and add files not yet present with the
current date (and any other meta data you might need).
Then query all the files of interest and do whatever you want
to do with them and remove the entry.
Downside is you have possibly another dependency. On the plus
side you could easily query all files older than X days or
whatever with a single select and batch process them.
Hi Wjoe,
Thank you very much, but what i am expecting is something like
OS switch, based of OS type switch the funciton eg:
If OS is windows use the funciton timeCreated else if the OS is
linux use the function timeLastAccessed in the below example
program, something similar as stated in the link
https://dlang.org/spec/declaration.html#alias
Eg1:
version (Win32)
{
alias myfoo = win32.foo;
}
version (linux)
{
alias myfoo = linux.bar;
}
auto clogClean (string LogDir ) {
Array!(Tuple!(string, SysTime)) dFiles;
version (Windows) { alias sTimeStamp =
std.file.DirEntry.timeCreated;} else version (linux) { alias
sTimeStamp = std.file.DirEntry.timeLastAccessed; }
dFiles.insert(dirEntries(LogDir, SpanMode.shallow).filter!(a =>
a.isFile).map!(a => tuple(a.name, a.sTimeStamp)));
return dFiles;
}
From,
Vino.B
Re: using Unsized Arrays in Structures from d?
On Friday, 4 May 2018 at 13:02:08 UTC, NewUser wrote:
How can I use the following c structure from d.
struct Item
{
int id;
};
struct Group
{
int i;
int item_count;
struct Item items[];
};
tried defining items[] as both "Item[] items" and "Item* items"
in d, it compiles okay but gives an error when trying to access
it.
Here is the error.
object.Error@(0): Access Violation
In the C code, the elements of `items` are directly part of the
struct. There is no indirection. D doesn't have dedicated syntax
for this, but you can hint at it with a zero-sized array:
struct Group
{
int i;
int item_count;
Item[0] items;
}
Then access an item with `group.items.ptr[index]`.
Store any callable in an array
I have a class that I want to be able to register callbacks and I'd like to be able to register any callable - functions, delegates, lambdas, anything. Is there another way to do it besides converting those toDelegate, which states a bug with @safe functions? Or better store each type in their own array ? Cheers!
Re: Windows to Linux Porting - timeCreated and timeLastAccessed
On Friday, 4 May 2018 at 15:30:26 UTC, Vino wrote:
On Friday, 4 May 2018 at 15:16:23 UTC, wjoe wrote:
[...]
Hi Wjoe,
Thank you very much, but what i am expecting is something
like OS switch, based of OS type switch the funciton eg:
If OS is windows use the funciton timeCreated else if the OS is
linux use the function timeLastAccessed in the below example
program, something similar as stated in the link
https://dlang.org/spec/declaration.html#alias
Eg1:
version (Win32)
{
alias myfoo = win32.foo;
}
version (linux)
{
alias myfoo = linux.bar;
}
auto clogClean (string LogDir ) {
Array!(Tuple!(string, SysTime)) dFiles;
version (Windows) { alias sTimeStamp =
std.file.DirEntry.timeCreated;} else version (linux) { alias
sTimeStamp = std.file.DirEntry.timeLastAccessed; }
dFiles.insert(dirEntries(LogDir, SpanMode.shallow).filter!(a =>
a.isFile).map!(a => tuple(a.name, a.sTimeStamp)));
return dFiles;
}
From,
Vino.B
I think that's not possible. You can't query information that
hasn't been stored.
Your best bet in a Change-Function-Name-Port would probably be to
use access time and mount the file system with options that won't
touch that anymore after creation. But me thinks such a solution
would be rather unreliable and not worth the time investment.
Re: using Unsized Arrays in Structures from d?
On Friday, 4 May 2018 at 15:37:28 UTC, ag0aep6g wrote:
On Friday, 4 May 2018 at 13:02:08 UTC, NewUser wrote:
How can I use the following c structure from d.
struct Item
{
int id;
};
struct Group
{
int i;
int item_count;
struct Item items[];
};
tried defining items[] as both "Item[] items" and "Item*
items" in d, it compiles okay but gives an error when trying
to access it.
Here is the error.
object.Error@(0): Access Violation
In the C code, the elements of `items` are directly part of the
struct. There is no indirection. D doesn't have dedicated
syntax for this, but you can hint at it with a zero-sized array:
struct Group
{
int i;
int item_count;
Item[0] items;
}
Then access an item with `group.items.ptr[index]`.
Hi ag0aep6g,
Thanks a lot for that.
I should have thought of that (i would still have missed the .ptr
part), the old c syntax for the same thing used to be "Item
items[0]".
Thanks,
NewUser
Re: Ambiguous template parameter names
On Thursday, 3 May 2018 at 13:30:03 UTC, bauss wrote:
On Thursday, 3 May 2018 at 02:51:18 UTC, Meta wrote:
If you want that, you might be able to do `int val = val` on
the inner function, though I'm not sure that'll work.
It does not work and will do nothing.
Below compiles, but my guess is that the ASM is saying that the
foo function only has a run-time argument.
template foo(int val)
{
int foo(int val = val)
{
return val;
}
}
void main()
{
assert(foo!1 == 1);
assert(foo!1(2) == 2);
}
Re: Store any callable in an array
On Friday, 4 May 2018 at 15:36:29 UTC, wjoe wrote:
I have a class that I want to be able to register callbacks and
I'd like to be able to register any callable - functions,
delegates, lambdas, anything.
Is there another way to do it besides converting those
toDelegate, which states a bug with @safe functions?
Or better store each type in their own array ?
Cheers!
auto asDelegate(TFunc)(TFunc func) @trusted
{
import std.functional : toDelegate;
return toDelegate(func);
}
The "@trusted" means that you promise this thing is safe, even if
the compiler can't be certain.
Re: Windows to Linux Porting - timeCreated and timeLastAccessed
If you just want to clean logs, then use modification time on all
oses:
auto clogClean (string LogDir ) {
Array!(Tuple!(string, SysTime)) dFiles;
dFiles.insert(dirEntries(LogDir, SpanMode.shallow).filter!(a =>
a.isFile).map!(a => tuple(a.name, a.timeLastModified)));
return dFiles;
}
Re: Store any callable in an array
On 05/04/2018 06:33 PM, Neia Neutuladh wrote:
auto asDelegate(TFunc)(TFunc func) @trusted
{
import std.functional : toDelegate;
return toDelegate(func);
}
The "@trusted" means that you promise this thing is safe, even if the
compiler can't be certain.
If toDelegate isn't (always) @safe, how can you be sure that your
wrapper is? Also, TFunc may have an unsafe destructor.
That's not good use of `@trusted`.
Re: Is HibernateD dead?
I've written an email to Vadim, maybe we get a reply on the
status of both projects.
On Friday, 4 May 2018 at 07:18:09 UTC, bauss wrote:
[...]
Would it maybe be easier for you to base on ddbc[1] or another
existing abstraction layer for database abstraction?
Ddbc is pretty neat, and even has support for reading structs
directly from the database.
Perhaps, but it'd have to be a forked version as I don't really
want to depend on something that isn't updated regularly.
ddbc's last commit was a year ago.
Yes, at the moment using ddbc and relying on it would mean taking
over some maintenance of it. Ddbc is fairly complete though and
might save you a lot of work, because it already abstracts a lot
of (relational) database systems.
I can't seem to find a license for it though?
It's Boost licensed (BSL-1.0), but probably needs an explicit
LICENSE file.
Maybe we can move ddbc to dlang-community, so more people can
easily commit changes to it (provided it gets accepted there, and
Vadim agrees with that move as well).
Perhaps I will end up having another "optional" dependency to
it as a temporary until I can have a better implementation or
something.
Taking over maintenance of it might be easier than reimplementing
the database abstraction again though.
For Postgres, ddbc worked really well for me, and I assume its
SQLite, MySQL and ODBC drivers are also still working well,
meaning less work for you.
Without ddbc, you'd have to write new abstraction on top of some
other libraries, like dpq2.
The frontend part of postgresql is almost finished, it's just
having the postgresql driver working properly, which is where
it's frozen right now.
Hmm... Does any public code for that exist already that I
could play around with?
Unfortunately, I have a few more unusual requirements for
Postgres, like:
* UUIDs as primary keys, instead of integers
As far as I remember the implementation of @DbId in Diamond,
then it supports whatever type.
Native support for std.uuid.UUID would be neat :-) For Hibernated
I use a mixin to convert a UUID into strings transparently, for
database insertion.
Diamond doesn't care much about what type your primary key is.
I will make sure that's how it function of course, if it
currently doesn't behave like it, but I'm pretty sure it does.
* Ability to register custom datatypes with the ORM (version
numbers in this case, the ORM can view them as text, but the
database has a special type for them)
That could be done with some attribute that lets you handle
columns yourself.
Do you have a good name for it?
I was thinking @DbProxy and then the function would be
something like:
[...]
Registering a new type with Postgres yields a new OID to identify
the type, so I would need a function to tell the Postgres backend
to treat OIDs of a certain number like "text" types. Ideally, I
would also need to annotate entity to set a specific column type,
like:
```
class Entity {
UUID uuid;
@ColumType("versionnumber")
string _version;
}
```
(With the result of CREATE TABLE not setting a "text" type for
the new version column, but a "versionnumber" type instead)
That would do it. For Hibernated, I have Hibernated create the
table initially, and then fire an ALTER TABLE at it afterwards to
change the column type, while at the same time registering the
new type OID with ddbc to be treated as text.
As said, this is a very specific requirement very few people will
have ^^
Much more frequently people will ask for JSONB and JSON type
support for a postgres driver though, I guess. For that,
specifying the column type explicitly could be quite helpful as
well, so switch between JSONB and JSON.
* Obviously the usual ORM stuff, one-to-many, many-to-many,
etc. relations
Yes, relations is one thing I haven't added and I have been
wanting to do it for a while.
I will definitely look into having it added as well.
That's kind of key for an ORM :-) Handling relations manually was
what made me abandon my "I just write raw SQL for everything"
ways, because it gets quite complex and annoying in the long run.
(Obviously not a must-have list, I added support for custom
datatypes to my ddbc fork as well, because it's not really a
feature many people need)
Well, that's kind of the key to most of the development in
Diamond.
I usually add functionality that isn't widely used and in most
cases people implement it themselves ex. the whole diamond.seo
is not usually something a framework has.
I keep an eye on it - at the moment, Vibe.d satisfies all
requirements I have on a web framework, but that might change.
A well integrated ORM would certainly be a game changer, since
Vibe.d is limited to Mongo and Redis only.
Diamond is a neat project, I played around with it about half
a year ago, but didn't test the ORM part at all back then.
It wasn't that good back then and has improved a lot since, as
well many other par
Re: Derelict on Ubuntu with CODE::BLOCKS
On Thursday, 3 May 2018 at 19:30:48 UTC, Mike Parker wrote: On Thursday, 3 May 2018 at 18:36:04 UTC, RegeleIONESCU wrote: [...] So your app is compiling and executing. This is a runtime error. The SymbolLoadException means the SDL library was loaded, but a function Derelict expected to find was not there. This usually means that your version of Derelict by default supports a different version of SDL than you have on your system. [...] It works, even when loading all the libraries. I played with different versions and loaded libraries one by one to see how it works. I even managed to make a window - for me it is a big thing. Thank you, thank you, thank you for your kind and detailed support!
Error: module `hello` is in file 'hello.d' which cannot be read
Hi
I just installed D on my windows 10 and want to try to compile a
hello world. My source is a classical
import std.stdio;
void main() {
writeln("Hello, World!");
}
And I try to compile and get
C:\D>dmd hello.d
Error: module `hello` is in file 'hello.d' which cannot be read
import path[0] = C:\D\dmd2\windows\bin\..\..\src\phobos
import path[1] = C:\D\dmd2\windows\bin\..\..\src\druntime\import
What do I do wrong ?
D is installed at de root of C:, and the hello.d source code is
at C:\D\dmd2\sources.
Thank you to you
Alex
Re: Error: module `hello` is in file 'hello.d' which cannot be read
On Fri, May 04, 2018 at 11:29:12PM +, Alex via Digitalmars-d-learn wrote:
> Hi
>
> I just installed D on my windows 10 and want to try to compile a hello
> world. My source is a classical
>
> import std.stdio;
> void main() {
> writeln("Hello, World!");
> }
>
> And I try to compile and get
>
> C:\D>dmd hello.d
> Error: module `hello` is in file 'hello.d' which cannot be read
> import path[0] = C:\D\dmd2\windows\bin\..\..\src\phobos
> import path[1] = C:\D\dmd2\windows\bin\..\..\src\druntime\import
>
> What do I do wrong ?
>
> D is installed at de root of C:, and the hello.d source code is at
> C:\D\dmd2\sources.
[...]
Where is your current directory? If hello.d is in C:\D\dmd2\sources
then you need to:
C:
cd \D\dmd2\sources
dmd hello.d
T
--
Life begins when you can spend your spare time programming instead of
watching television. -- Cal Keegan
Re: Store any callable in an array
On Friday, 4 May 2018 at 19:12:16 UTC, ag0aep6g wrote: If toDelegate isn't (always) @safe, how can you be sure that your wrapper is? If it were @safe, the compiler would accept it. Looking at the code, I believe there are several casts that the compiler can't verify but are used safely. Also, TFunc may have an unsafe destructor. If it's a delegate with an un-@safe destructor (how would that work? a captured context variable?), then it's already not @safe. If it's a function, it doesn't have a destructor. If it's a user-defined type with opCall, that's something to pay attention to, but it's beyond the scope of the original question.
