Are you tired of copy pasting your code into your README.md file, just to
forget about it later on and have unsynced copies? Or even worse, code
that does not even compile?
Then embedmd is for you!
embedmd embeds files or fractions of files into Markdown files. It does
so by searching embedmd commands, which are a subset of the Markdown
syntax for comments. This means they are invisible when Markdown is
rendered, so they can be kept in the file as pointers to the origin of
the embedded text.
The command receives a list of Markdown files. If no list is given, the command reads from the standard input.
The format of an embedmd command is:
[embedmd]:# (pathOrURL language /start regexp/ /end regexp/)The embedded code will be extracted from the file at pathOrURL,
which can either be a relative path to a file in the local file
system (using always forward slashes as directory separator) or
a URL starting with http:// or https://.
If the pathOrURL is a URL the tool will fetch the content in that URL.
The embedded content starts at the first line that matches /start regexp/
and finishes at the first line matching /end regexp/.
Omitting the the second regular expression will embed only the piece of text
that matches /regexp/:
[embedmd]:# (pathOrURL language /regexp/)To embed the whole line matching a regular expression you can use:
[embedmd]:# (pathOrURL language /.*regexp.*/)To embed from a point to the end you should use:
[embedmd]:# (pathOrURL language /start regexp/ $)To embed a whole file, omit both regular expressions:
[embedmd]:# (pathOrURL language)You can omit the language in any of the previous commands, and the extension of the file will be used for the snippet syntax highlighting.
This works when the file extensions matches the name of the language (like Go
files, since .go matches go). However, this will fail with other files like
.md whose language name is markdown.
[embedmd]:# (file.ext)You can install Go by following these instructions.
embedmd is written in Go, so if you have Go installed you can install it with
go get:
go get github.com/campoy/embedmd
This will download the code, compile it, and leave an embedmd binary
in $GOPATH/bin.
Eventually, and if there's enough interest, I will provide binaries for every OS and architecture out there ... eventually.
Given the two files in sample:
hello.go:
// Copyright 2016 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package main
import (
"fmt"
"time"
)
func main() {
fmt.Println("Hello, there, it is", time.Now())
}docs.md:
# A hello world in Go
Go is very simple, here you can see a whole "hello, world" program.
[embedmd]:# (hello.go)
We can try to embed a file from a directory.
[embedmd]:# (test/hello.go /func main/ $)
You always start with a `package` statement like:
[embedmd]:# (hello.go /package.*/)
Followed by an `import` statement:
[embedmd]:# (hello.go /import/ /\)/)
You can also see how to get the current time:
[embedmd]:# (hello.go /time\.[^)]*\)/)-
-w: Executingembedmd -w docs.mdwill modifydocs.mdand add the corresponding code snippets, as shown in sample/result.md. -
-d: Executingembedmd -d docs.mdwill display the difference between the contents ofdocs.mdand the output ofembedmd docs.md.
This is not an official Google product (experimental or otherwise), it is just code that happens to be owned by Google.
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