gd

gd

The gd program runs a single file Go program and renders it and its output as Markdown. It also allows inclusion of plain prose via C-style comments with a {md} prefix.

Example output

This is the output from running the Go Hello World program with gd.

```
package main

import "fmt"

func main() {
	fmt.Println("Hello, world!")
```
> ```stdout
> Hello, world!
> ```
```
}
```

Which will render as this:

package main

import "fmt"

func main() {
	fmt.Println("Hello, world!")

Hello, world!

}

gd can also include graphic output in the Markdown document.

Limitations

Panic calls cannot be reflected in output since a panic takes control away from the gd-running program. To be able to capture output and associate it with source code lines, gd rewrites imports of "fmt" and "log" to "github.com/kortschak/gd/fmt" and "github.com/kortschak/gd/log". Behaviour of "fmt" is well replicated, but gd replaces log.Panic* calls with a simulation of a panic that outputs a stack trace and then exits. This means that stack unwinding is not performed and a log.Panic* call cannot be recovered. The panic built-in behaves as normal, but the panic output cannot be retrieved by gd.