Re: How come a count of a range becomes 0 before a foreach?
On Sunday, 9 April 2023 at 03:39:52 UTC, Steven Schveighoffer wrote: On 4/8/23 9:38 PM, ikelaiah wrote: // Get files in specified inputPath variable with a specific extension auto rmdFiles = file.dirEntries(inputPath, file.SpanMode.shallow) .filter!(f => f.isFile) .filter!(f => f.name.endsWith(fileEndsWith)); // LINE 72 -- WARNING -- If we count the range here, later it will become 0 in line 82 writeln(programName ~ ": number of files found " ~ to!string(rmdFiles.walkLength)); dirEntries returns an *input range*, not a *forward range*. This means that once it's iterated, it's done. If you want to iterate it twice, you'll have to construct it twice. -Steve Steve, You're absolutely right. I did not read the manual correctly. It is clearly written [here](https://dlang.org/library/std/file/dir_entries.html) that `dirEntry` is an `input range`. I will modify the code to construct it twice. Many thanks! -ikelaiah
Re: How come a count of a range becomes 0 before a foreach?
On 4/8/23 9:38 PM, ikelaiah wrote: // Get files in specified inputPath variable with a specific extension auto rmdFiles = file.dirEntries(inputPath, file.SpanMode.shallow) .filter!(f => f.isFile) .filter!(f => f.name.endsWith(fileEndsWith)); // LINE 72 -- WARNING -- If we count the range here, later it will become 0 in line 82 writeln(programName ~ ": number of files found " ~ to!string(rmdFiles.walkLength)); dirEntries returns an *input range*, not a *forward range*. This means that once it's iterated, it's done. If you want to iterate it twice, you'll have to construct it twice. -Steve
How come a count of a range becomes 0 before a foreach?
Hi,
I've written a file that converts Rmd (R Markdown file), to a
MarkDown file.
All works well if and only if line 73 is commented out.
I marked line 72 in the code below.
If line 73 is not commented out, `foreach` does not execute as
the `rmdFiles.walklength` in line 82 becomes `0`.
How does `rmdFiles.walkLength` becomes `0` before the `foreach`?
I'm a but confused.
Can someone clarify? Thank you.
```d
module rmd2md;
import std.algorithm;
import std.stdio;
import file = std.file;
import std.conv;
import std.regex;
import std.getopt;
import std.path;
import std.datetime;
import std.parallelism;
import std.range;
void main(string[] args)
{
// Set variables for the main program
string programName = "Rmd2md";
// Setup Regex for capturing Rmd code snippet header
Regex!char re = regex(r"`{3}\{r[a-zA-Z0-9= ]*\}", "g");
// Set default values for the arguments
string inputPath = file.getcwd();
string fileEndsWith = ".Rmd";
string outputPath = file.getcwd();
// Set GetOpt variables
auto helpInformation = getopt(
args,
"path|p", "Path of Rmd files. Default: current working
directory.", &inputPath,
"fext|e", "Extension of Rmd files. Default: `.Rmd`",
&fileEndsWith,
"fout|o", "Output folder to save the MD files. Default:
current working directory.", &outputPath
);
if (helpInformation.helpWanted)
{
defaultGetoptPrinter("Rmd to Markdown (md) file
converter.",
helpInformation.options);
return;
}
// is the path valid?
if (!std.path.isValidPath(inputPath))
{
writeln(programName ~ ": invalid input path");
return;
}
// is output path valid?
if (!std.path.isValidPath(outputPath))
{
writeln(programName ~ ": invalid output path");
return;
}
// is file extension valid?
if (!startsWith(fileEndsWith, "."))
{
writeln(programName ~ ": invalid extension given");
return;
}
writeln(programName ~ ": input directory is " ~ inputPath);
writeln(programName ~ ": output directory is " ~ outputPath);
writeln(programName ~ ": ...");
// Get files in specified inputPath variable with a specific
extension
auto rmdFiles = file.dirEntries(inputPath,
file.SpanMode.shallow)
.filter!(f => f.isFile)
.filter!(f => f.name.endsWith(fileEndsWith));
// LINE 72 -- WARNING -- If we count the range here, later it
will become 0 in line 82
writeln(programName ~ ": number of files found " ~
to!string(rmdFiles.walkLength));
// Get start time
auto stattime = Clock.currTime();
// Process each Rmd file
int fileWrittenCount = 0;
// LINE 81 -- WARNING -- if line 73 is not commented out, the
walkLength returns 0
writeln(programName ~ ": number of files found " ~
to!string(rmdFiles.walkLength));
foreach (file.DirEntry item; parallel(rmdFiles))
{
writeln(programName ~ ": processing " ~ item.name);
try
{
// Read content as string
string content = file.readText(item.name);
// Replace ```{r} or ```{r option1=value} with ```R
string modified = replaceAll(content, re, "```R");
// Set the Markdown output file
string outputFile = replaceAll(baseName(item.name),
regex(r".Rmd"), ".md");
// Build an output path, using output path and
baseName(item.name)
string outputFilenamePath = buildPath(outputPath,
outputFile);
// Save output Markdown file
file.write(outputFilenamePath, modified);
writeln(programName ~ ": written " ~
outputFilenamePath);
// Increase counter to indicate number of files
processed
fileWrittenCount++;
}
catch (file.FileException e)
{
writeln(programName ~ ": " ~ e.msg);
}
}
writeln(programName ~ ": ...");
// Gett end clock
auto endttime = Clock.currTime();
auto duration = endttime - stattime;
writeln("Duration: ", duration);
// Console output a summary
writeln(programName ~ ": written " ~
to!string(fileWrittenCount) ~ " files");
}
```
For testing, you can create a text file, save as `.Rmd` in the
same folder as the D file. Run the script as:
```bash
rdmd rmd2md.d
```
It will find the `.Rmd` file in current path and save it in the
current path.
Re: How to setup D with SFML? (using bindbc-sfml)
On Saturday, 8 April 2023 at 23:40:32 UTC, Mike Parker wrote:
Not without error messages. The first thing you should do is
use the error API in bindbc.loader to print them out. That
should tell you what the problem is.
I installed it on my Linux system without using a loader and with
static SFML. I just used apt-get and dub. I did the following in
order:
1. sudo apt-get install libsfml-dev libcsfml-dev
2. dub init dsfml bindbc-sfml
3. cd dsfml
4. edit dub.json and add:
```java
"libs": [
"csfml-audio",
"csfml-graphics"
],
"subConfigurations": {
"bindbc-sfml": "staticBC"
},
"versions": [
"SFML_Audio",
"SFML_Graphics"
],
```
5. dub
**app.d**
```d
import bindbc.sfml;
void main()
{
sfContextSettings* settings;
sfEvent event;
auto window = sfRenderWindow_create(
sfVideoMode(750, 500),
"Japanese Flag",
sfWindowStyle.sfDefaultStyle,
settings
);
auto flag = sfCircleShape_create();
flag.sfCircleShape_setRadius(150);
flag.sfCircleShape_setPosition(sfVector2f(225, 100));
flag.sfCircleShape_setFillColor(sfRed);
while(window.sfRenderWindow_isOpen())
{
while(window.sfRenderWindow_pollEvent(&event))
{
if(event.type == sfEventType.sfEvtClosed)
{
window.sfRenderWindow_close();
}
}
window.sfRenderWindow_clear(sfWhite);
window.sfRenderWindow_drawCircleShape(flag, null);
window.sfRenderWindow_display();
}
}
```
SDB@79
Re: How to setup D with SFML? (using bindbc-sfml)
On Saturday, 8 April 2023 at 11:31:40 UTC, Ki Rill wrote: How do I set up a D and SFML project using the `bindbc-sfml` package? I tried following the instructions, it builds successfully, but fails to load the SFML library at runtime. In particular, `loadSFML, loadSFMLGraphics, loadSFMLXXX` fails. Here is [link](https://github.com/rillki/d-sfml-project-template) to the repo. I plan to create another how-to video, but I cannot find what's causing it to fail. Do you have any ideas? Not without error messages. The first thing you should do is use the error API in bindbc.loader to print them out. That should tell you what the problem is.
How to setup D with SFML? (using bindbc-sfml)
How do I set up a D and SFML project using the `bindbc-sfml` package? I tried following the instructions, it builds successfully, but fails to load the SFML library at runtime. In particular, `loadSFML, loadSFMLGraphics, loadSFMLXXX` fails. Here is [link](https://github.com/rillki/d-sfml-project-template) to the repo. I plan to create another how-to video, but I cannot find what's causing it to fail. Do you have any ideas?
