7e4533640b
* Add embed-directive example and rename embedding to struct-embedding Signed-off-by: peterzhu1992 <peterzhu1992@gmail.com> * Minor tweaks Signed-off-by: peterzhu1992 <peterzhu1992@gmail.com> * Add some improvements Signed-off-by: peterzhu1992 <peterzhu1992@gmail.com> * Add isDir() checks for measure.go and generate.go in tools Signed-off-by: peterzhu1992 <peterzhu1992@gmail.com>
46 lines
1.5 KiB
Go
46 lines
1.5 KiB
Go
// `//go:embed` is a compiler directive that allows programs to include arbitrary
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// files/folders in the binary. Read more about go directive
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// [here](https://dave.cheney.net/2018/01/08/gos-hidden-pragmas).
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package main
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// If no exported identifiers is directly used from `embed` package,
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// you can add an underscore `_` before the package name. In this example, we simply
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// import it as we need to use the `embed.FS` type from the package.
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import (
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//_ "embed"
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"embed"
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)
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// Since one file is defined after the directive, the compiler will only include
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// this single file, followed by variable `single_file_string` to access as `string` type.
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//go:embed example_folder/single_file.txt
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var single_file_string string
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// Here is a similar example but include single file as `[]byte`.
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//go:embed example_folder/single_file.txt
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var single_file_byte []byte
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// We can also embed multiple files or even folders with wildcard.
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//go:embed example_folder/single_file.txt
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//go:embed example_folder/*.hash
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var folder_FS embed.FS
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func main() {
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// Print out content of `example_single_file.txt` as `string`.
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print(single_file_string)
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// Now handle `[]byte`.
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print(string(single_file_byte))
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// Retrieve file(s) matching `*.hash` pattern by reading from variable `folder_FS` first,
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// then print out.
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hash_file1 := "example_folder/multi_file1.hash"
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hash_file2 := "example_folder/multi_file2.hash"
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hash_content1, _ := folder_FS.ReadFile(hash_file1)
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hash_content2, _ := folder_FS.ReadFile(hash_file2)
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print(string(hash_content1))
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print(string(hash_content2))
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}
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