File Paths in OpenSCAD

The MCAD library provides functions to work with file paths in OpenSCAD. While OpenSCAD doesn’t have built-in file path manipulation functions like Go’s filepath package, we can use string operations and some helper functions to achieve similar results.

include <MCAD/strings.scad>

// Join function to construct paths
function join_path(paths) = 
    reduce(function(a, b) str(a, "/", b), paths);

// Main function to demonstrate file path operations
function main() = 
    let(
        p = join_path(["dir1", "dir2", "filename"]),
        filename = "config.json"
    )
    [
        str("p: ", p),
        str("Join example: ", join_path(["dir1//", "filename"])),
        str("Dir(p): ", substr(p, 0, search("/", p, 0)[len(search("/", p, 0)) - 1])),
        str("Base(p): ", substr(p, search("/", p, 0)[len(search("/", p, 0)) - 1] + 1)),
        str("IsAbs(dir/file): ", substr(p, 0, 1) == "/"),
        str("IsAbs(/dir/file): ", substr("/dir/file", 0, 1) == "/"),
        str("Ext: ", substr(filename, search(".", filename)[0])),
        str("TrimSuffix: ", substr(filename, 0, search(".", filename)[0]))
    ];

// Print results
results = main();
for (result = results) {
    echo(result);
}

In this OpenSCAD example:

1. We include the MCAD library for string operations.

2. We define a join_path function that mimics the behavior of filepath.Join.

3. The main function demonstrates various file path operations:

   • Path joining
   • Getting the directory and base name of a path
   • Checking if a path is absolute
   • Getting the file extension
   • Trimming the extension from a filename

4. We use string operations like substr and search to manipulate paths.

5. The results are stored in a list and then printed using echo.

To run this code:

$ openscad -o output.txt file-paths.scad

This will execute the OpenSCAD script and output the results to output.txt.

Note that OpenSCAD is primarily a 3D modeling language, so some concepts from Go (like error handling or working with actual file systems) don’t have direct equivalents. This example focuses on string manipulation to demonstrate similar functionality.