Scriggo command

Scriggo has a command line interface, the scriggo command, that allows to:

Get the scriggo command

You can get the binary of the scriggo command from the releases page.

Alternatively, you can install the command with the go install command as explained below.

Before installing the Scriggo command, download and install Go.

When Go is installed, open a terminal and execute:

$ go install github.com/open2b/scriggo/cmd/scriggo@latest

then test if scriggo can be executed:

$ scriggo version
scriggo version v0.53.5 (go1.17)

If the scriggo command is not found, you should add the directory where the command has been installed to your PATH.

go installs the scriggo command in the directory named by the GOBIN environment variable. If it is not set it defaults to $GOPATH/bin or, if the GOPATH environment variable is not set, to $HOME/go/bin.

Get help from command line

To get help from the command line run the following command:

$ scriggo help

Run a template file

The Scriggo Run command runs a template file and its extended, imported and rendered files. All Scriggo builtins are available in the template file.

The basic Run command takes this form:

$ scriggo run [-o output] file

For example:

scriggo run article.html

runs the file "article.html" as HTML and prints the result to the standard output. Extended, imported and rendered file paths are relative to the directory of the executed file.

The -o flag writes the result to the named output file or directory, instead to the standard output.

Markdown is converted to HTML with the Goldmark parser with the options html.WithUnsafe, parser.WithAutoHeadingID and extension.GFM.

Complete syntax

The complete scriggo run command takes this form:

$ scriggo run [-o output] [-root dir] [-const name=value] [-format format] [-metrics] [-S n] file 

The -o flag writes the resulting code to the named output file or directory.

The -root flag sets the root directory to named directory instead of the file's directory.

The -const flag runs the template file with a global constant with the given name and value. name should be a Go identifier and value should be a string literal, a number literal, true or false. There can be multiple name=value pairs.

The -format flag forces render to use the named file format.

The -metrics flag prints metrics about execution time.

The -S flag prints the assembly code of the executed file and n determines the maximum length, in runes, of disassembled Text instructions

n > 0: at most n runes; leading and trailing white space are removed
n == 0: no text
n < 0: all text

Examples

$ scriggo run index.html
$ scriggo run -const 'version=1.12 title="The ancient art of tea"' index.md
$ scriggo run -root . docs/article.html
$ scriggo run -format Markdown index
$ scriggo run -o ./public ./sources/index.html

Serve a template

The Scriggo Serve command runs a web server and serves the template rooted at the current directory. All Scriggo builtins are available in template files. It is useful to learn Scriggo templates.

The basic Serve command takes this form:

$ scriggo serve

It renders HTML and Markdown files based on file extension.

For example, serving this request:

http://localhost:8080/article

it renders the file "article.html" as HTML if exists, otherwise renders the file "article.md" as Markdown.

Serving a URL terminating with a slash:

http://localhost:8080/blog/

it renders "blog/index.html" or "blog/index.md".

Markdown is converted to HTML with the Goldmark parser with the options html.WithUnsafe, parser.WithAutoHeadingID and extension.GFM.

Templates are automatically rebuilt when a file changes.

Complete syntax

The complete scriggo serve command takes this form:

$ scriggo serve [-S n] [--metrics] 

The -S flag prints the assembly code of the served file and n determines the maximum length, in runes, of disassembled Text instructions

n > 0: at most n runes; leading and trailing white space are removed
n == 0: no text
n < 0: all text

The --metrics flags prints metrics about execution time.

Initialize an interpreter

The Scriggo Init command initializes an interpreter for Go programs. It creates the following files:

  • go.mod
  • go.sum
  • main.go
  • packages.go
  • Scriggofile

The syntax is:

$ scriggo init [dir]

where dir is the directory in which to create the files. If no argument is given, scriggo init uses the current directory. If the directory already contains ".go" files or a "vendor" directory, the command fails.

The command creates a Scriggofile with the instruction to create an importer for the Go standard library.

If the directory does not contain a go.mod file, the command creates it and as module path uses the directory name.

Generate a package importer

The Scriggo Import command generate the code for a package importer. An importer is used by Scriggo to import a package when an "import" declaration is executed.

The code for the importer is generated from the instructions in a Scriggofile. The Scriggofile should be in a Go module.

The basic Import command takes this form:

$ scriggo import [-o output]

For example:

$ scriggo import -o packages.go

generates the code for an importer, with instructions in a Scriggofile called "Scriggofile" in the current directory and writes it into the file "packages.go".

Complete syntax

The complete scriggo import command takes this form:

$ scriggo import [-f Scriggofile] [-v] [-x] [-o output] [module]

If an argument is given, it must be a local rooted path or must begin with a . or .. element and it must be a module root directory. Import looks for a Scriggofile named "Scriggofile" in that directory.

If no argument is given, the action applies to the current directory.

The -f flag forces import to read the given Scriggofile instead of the Scriggofile of the module.

The importer in the generated Go file have type native.Importer and it is assigned to a variable named "packages". The variable can be used as an argument to the Build and BuildTemplate functions in the scriggo package.

To give a different name to the variable use the instruction SET VARIABLE in the Scriggofile:

SET VARIABLE foo

The package name in the generated Go file is by default "main", to give a different name to the package use the instruction SET PACKAGE in the Scriggofile:

SET PACKAGE boo

The -v flag prints the imported packages as defined in the Scriggofile.

The -x flag prints the executed commands.

The -o flag writes the generated Go file to the named output file, instead to the standard output.