How to parse embed.FS templates with the template.ParseFS function

Question

I want to parse all of the templates in the same template.Template struct but I don't know how and also it gives me an error. I have the next code:

package main

import (
    "embed"
    "html/template"
    "log"
    "os"
)

//go:embed internal/web/views/*
var viewsFS embed.FS

func main() {
    tmpls, err := template.New("").ParseFS(viewsFS, "**/*.html")
    if err != nil {
        log.Fatal(err) // Debugging I finded out that the error is here so the code below is irrelevant
    }
    tmpls.ExecuteTemplate(os.Stdout, "pages/home", nil)
}

The error that gives me the ParseFS method is the next:

$ 2023/09/16 23:36:42 template: pattern matches no files: `**/*.html`

I think that the error is in the patterns parameter of the ParseFS method I don't know.

I have many html files inside of the internal/web/views directory, in fact all of the files inside that folder are html files, each one having one or more {{define}}-type templates.

I will appreciate any help thank you

Answer 1

@Charlie-Tumahai credits to him for this documentation (Official Go Package website) about Glob patterns in Go

So in order to parse all of my templates in the same template.Template struct I had to do the next:

package main

import (
    "embed"
    "html/template"
    "log"
    "os"
)

//go:embed internal/web/views/*
var viewsFS embed.FS

func main() {
    tmpls, err := template.New("").
        ParseFS(viewsFS,
            "internal/web/views/*/*.html",
            "internal/web/views/*/*/*.html",
            /* Add more `*` if you have templates that are more nested */
        )
    if err != nil {
        log.Fatal(err)
    }
    tmpls.ExecuteTemplate(os.Stdout, "pages/home", nil)
}

What I did was research more about Glob patterns and learn how to use it in Go, Glob patterns in Go are made in a different way that in any other language.