Re: dmd as a library
On Wednesday, 9 November 2022 at 11:45:46 UTC, Dennis wrote: On Tuesday, 8 November 2022 at 05:48:54 UTC, vushu wrote: Ah thanks that's nice to have some examples. Here's an example of tools using dmd as a library: https://github.com/jacob-carlborg/dlp Thanks, much appreciated
Re: dirEntries removes entire branches of empty directories
On Wednesday, 9 November 2022 at 19:59:57 UTC, Ali Çehreli wrote: On 11/9/22 11:48, Imperatorn wrote: > That's not the behaviour I get in Windows. Windows users deserve it! :p (At least it is better in this case. :) ) > When I create the subdirectory, I see it even if it's empty struct DirIteratorImpl has different implementations for Windows, etc. Ali Anyway, it's definitely a bug in that implementation
Re: dirEntries removes entire branches of empty directories
On Wednesday, 9 November 2022 at 20:06:15 UTC, Ali Çehreli wrote: On 11/9/22 11:05, Ali Çehreli wrote: It was pretty easy to use but there is a quality issue there: They failed to support a 'void*' context for the user! You can walk the tree but can't put the results into your local context! Boo!
Re: dirEntries removes entire branches of empty directories
On 11/9/22 11:05, Ali Çehreli wrote: > Can you think of a workaround to achieve that? Me, me, me! :) I've learned about the Posix function 'nftw' (but I am using its sibling 'ftw'). It was pretty easy to use but there is a quality issue there: They failed to support a 'void*' context for the user! You can walk the tree but can't put the results into your local context! Boo! I guess it was designed by someone who is happy with global variables. :) At least D makes it easy to guard access to module variables with 'synchronized', shared, etc. Ali
Re: dirEntries removes entire branches of empty directories
On 11/9/22 11:48, Imperatorn wrote: > That's not the behaviour I get in Windows. Windows users deserve it! :p (At least it is better in this case. :) ) > When I create the subdirectory, I see it even if it's empty struct DirIteratorImpl has different implementations for Windows, etc. Ali
Re: dirEntries removes entire branches of empty directories
On Wednesday, 9 November 2022 at 19:05:58 UTC, Ali Çehreli wrote: In case it matters, the file system is ext4. 1) Create a directory: [...] That's not the behaviour I get in Windows. When I create the subdirectory, I see it even if it's empty
Re: dirEntries removes entire branches of empty directories
On Wednesday, 9 November 2022 at 19:05:58 UTC, Ali Çehreli wrote:
In case it matters, the file system is ext4.
My code runs in tmp (tmpfs).
2) Make a sub-directory:
mkdir deleteme/a
Running the program shows no output; 'a' is not visited as a
directory entry.
Was say strace/ltrace?
```didi.d
import std.stdio;
import std.file;
void main (string [] args)
{
auto de = dirEntries (args[1], SpanMode.breadth);
foreach (e; de)
writeln(e.name);
}
```
```
$ mkdir -p deleteme/a
$ dmd didi
$ ./didi deleteme
deleteme/a
Do you think this is buggy behavior for dirEntries?
Sure.
Re: dirEntries removes entire branches of empty directories
On Wednesday, 9 November 2022 at 19:05:58 UTC, Ali Çehreli wrote:
Running the program shows no output; 'a' is not visited as a
directory entry.
That's not what happens for me:
```d
import std.exception;
import std.file;
import std.path;
import std.stdio;
void ls()
{
foreach (e; dirEntries(absolutePath("./deleteme"),
SpanMode.breadth)) {
writeln(e.name);
}
}
void main()
{
"./deleteme".rmdirRecurse.collectException;
"./deleteme".mkdir();
writeln("empty");
ls();
writeln("only a directory");
mkdir("./deleteme/a");
ls();
writeln("directory and file");
std.file.write("./deleteme/a/x", "");
ls();
}
```
Locally and on run.dlang.io I get:
```
empty
only a directory
/sandbox/./deleteme/a
directory and file
/sandbox/./deleteme/a
/sandbox/./deleteme/a/x
```
dirEntries removes entire branches of empty directories
In case it matters, the file system is ext4.
1) Create a directory:
mkdir deleteme
and then run the following program:
import std;
void main() {
foreach (e; dirEntries(absolutePath("./deleteme"), SpanMode.breadth)) {
writeln(e.name);
}
}
Understandably, the top level directory 'deleteme' will not be printed.
2) Make a sub-directory:
mkdir deleteme/a
Running the program shows no output; 'a' is not visited as a directory
entry.
3) Create a file inside the sub-directory:
touch deleteme/a/x
Now the program will show 2 entries; the branch is accessible:
/home/ali/d/./deleteme/a
/home/ali/d/./deleteme/a/x
Imagine a program that wants to make sure the directory structure is
intact, even the empty directories should exist. Can you think of a
workaround to achieve that?
Do you think this is buggy behavior for dirEntries?
Ali
Re: Passing a string by reference
On Tuesday, 8 November 2022 at 12:43:47 UTC, Adam D Ruppe wrote: In fact, ref in general in D is a lot more rare than in languages like C++. The main reason to use it for arrays is when you need changes to the length to be visible to the caller... which is fairly rare. In general many parameters are passed as const, the called function never changes the parameter. Which brings the question, will the compiler optimize the parameter so that the string is only passed as a pointer underneath when it knows it is a const?
Re: dmd as a library
On Tuesday, 8 November 2022 at 05:48:54 UTC, vushu wrote: Ah thanks that's nice to have some examples. Here's an example of tools using dmd as a library: https://github.com/jacob-carlborg/dlp
