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GNU GENERAL PUBLIC LICENSE
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How to Apply These Terms to Your New Programs
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The hypothetical commands `show w' and `show c' should show the appropriate
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# STEP
*Scriptable Template Processor*
STEP extends Go's HTML templates into a powerful backend scripting language. It
includes support for plugins to further enhance its functionality. It is
designed to run behind an HTTP reverse proxy, such as
[Caddy](https://caddyserver.com/).

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// Command step evaluates STEP files and prints the result to standard out.
package main
import "os"
import "io"
import "fmt"
import "context"
import "git.tebibyte.media/sashakoshka/step"
import "git.tebibyte.media/sashakoshka/go-cli"
import "git.tebibyte.media/sashakoshka/step/providers"
func main () {
// TODO: add some kind of way to play an http request to a STEP file,
// and have it be executed as if the request actually happened.
// TODO: initialize plugins on startup and tear them down on finish
// parse command line arguments
flagMetadata := cli.NewFlag (
'm', "metadata",
"Print document metadata as front matter")
cmd := cli.New (
"Evaluate STEP files and print the result",
flagMetadata,
cli.NewHelp())
cmd.Syntax = "[OPTIONS]... FILE"
cmd.ParseOrExit(os.Args)
if len(cmd.Args) > 1 {
cmd.Usage()
os.Exit(2)
}
// set up the environment
environment := step.Environment { }
environment.FuncProviders = providers.All()
err := environment.Init(context.Background())
handleErr(cmd, err)
// load and execute the document
var document *step.Document
if len(cmd.Args) > 0 {
document, err = environment.Parse(cmd.Args[0])
} else {
document, err = environment.ParseReader(".", os.Stdin)
}
handleErr(cmd, err)
if flagMetadata.Value == "true" {
writeMetadata(os.Stdout, document)
}
err = document.Execute(os.Stdout, step.ExecutionData { })
handleErr(cmd, err)
}
func handleErr (cmd *cli.Cli, err error) {
if err != nil {
cmd.Errorln(err)
os.Exit(1)
}
}
func writeMetadata (output io.Writer, document *step.Document) {
fmt.Fprintln(output, "---")
if document.Author != "" {
fmt.Fprintf(output, "Author: %s\n", document.Author)
}
if document.Title != "" {
fmt.Fprintf(output, "Title: %s\n", document.Title)
}
if document.Extends != "" {
fmt.Fprintf(output, "Extends: %s\n", document.Extends)
}
fmt.Fprintln(output, "---")
}

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package main
import "log"
import "fmt"
import "path"
import "io/fs"
import "strings"
import "net/http"
import "html/template"
import "path/filepath"
import "git.tebibyte.media/sashakoshka/step"
import "git.tebibyte.media/sashakoshka/goutil/container"
type handler struct {
environment *step.Environment
directories bool
stepExt ucontainer.Set[string]
index []string
}
func (this *handler) ServeHTTP (res http.ResponseWriter, req *http.Request) {
remoteAddr := req.RemoteAddr
if addr := req.Header.Get("CF-Connecting-IP"); addr != "" {
remoteAddr = fmt.Sprintf("%s --CF-> %s", addr, req.RemoteAddr)
} else if addr := req.Header.Get("X-Forwarded-For"); addr != "" {
remoteAddr = fmt.Sprintf("%s --??-> %s", addr, req.RemoteAddr)
}
log.Println("(i)", req.Method, req.URL, "from", remoteAddr)
// TODO log all this stuff
filesystem := this.environment.GetFS()
// normalize path
pat := req.URL.Path
if !strings.HasPrefix(pat, "/") {
pat = "/" + pat
req.URL.Path = pat
}
pat = path.Clean(req.URL.Path)
info, err := statFile(filesystem, pathToName(pat))
if err != nil {
// TODO need more detailed error, should allow specifying error
// documents
this.serveError(res, req, http.StatusNotFound, req.URL)
return
}
if info.IsDir() {
// try to find an index
for _, base := range this.index {
currentPath := path.Join(pat, base)
info, err := statFile(filesystem, pathToName(currentPath))
if err != nil { continue }
if info.IsDir() { continue }
this.serveFile(res, req, filesystem, currentPath)
return
}
// TODO: serve a directory
// have a custom directory listing document that takes in a list
// of the files in the directory and the path to the directory
// as data
if !this.directories {
this.serveError(res, req, http.StatusForbidden, req.URL)
return
}
}
this.serveFile(res, req, filesystem, pat)
}
func (this *handler) serveFile (res http.ResponseWriter, req *http.Request, filesystem fs.FS, pat string) {
name := pathToName(pat)
if !this.stepExt.Has(filepath.Ext(name)) {
// just a normal file
http.ServeFileFS(res, req, this.environment.GetFS(), name)
return
}
// parse and execute
document, err := this.environment.Parse(name)
if err != nil {
this.serveError(res, req, http.StatusInternalServerError, err)
return
}
err = document.Execute(res, step.ExecutionData {
Data: req,
})
if err != nil {
if tmplErr, ok := err.(*template.Error); ok {
log.Printf (
"ERR document %s:%s: %s\n",
name, tmplErr.Line, tmplErr.Description)
} else {
log.Printf("ERR document %s: %v\n", name, err)
}
}
}
func (this *handler) serveError (res http.ResponseWriter, req *http.Request, status int, message any) {
res.Header().Add("Content-Type", "text/plain")
res.WriteHeader(status)
// TODO: allow customization with templates
if message == nil {
fmt.Fprintf(res, "%d %s\n", status, http.StatusText(status))
} else {
fmt.Fprintf(res, "%d %s: %v\n", status, http.StatusText(status), message)
}
log.Printf("ERR %d %s: %v\n", status, http.StatusText(status), message)
}
func statFile (filesystem fs.FS, name string) (fs.FileInfo, error) {
if filesystem, ok := filesystem.(fs.StatFS); ok {
return filesystem.Stat(name)
}
file, err := filesystem.Open(name)
if err != nil { return nil, err }
defer file.Close()
return file.Stat()
}
func pathToName (pat string) string {
if strings.HasPrefix(pat, "/") {
pat = strings.TrimPrefix(pat, "/")
}
if pat == "" {
return "."
}
return pat
}

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// Command stepd provides an HTTP server that automatically executes STEP files.
package main
import "os"
import "log"
import "time"
import "errors"
import "context"
import "net/http"
import "git.tebibyte.media/sashakoshka/step"
import "git.tebibyte.media/sashakoshka/go-cli"
import "git.tebibyte.media/sashakoshka/step/providers"
import "git.tebibyte.media/sashakoshka/goutil/container"
import "git.tebibyte.media/sashakoshka/go-service/daemon"
import "git.tebibyte.media/sashakoshka/go-service/routines"
func main () {
// parse command line arguments
flagAddress := cli.NewInputFlag (
'a', "address",
"The address to host the server on",
":8080", cli.ValString)
flagDirectories := cli.NewFlag (
'd', "directories",
"Serve the contents of directories")
cmd := cli.New (
"Run an HTTP server that automaticaly executes STEP files",
flagAddress,
flagDirectories,
cli.NewHelp())
cmd.ParseOrExit(os.Args)
if len(cmd.Args) > 0 {
cmd.Usage()
os.Exit(1)
}
log.Println(`==========| STEP |===========`)
log.Println(`Scriptable Template Processor`)
log.Println(`... initializing`)
// set up the environment
environment := step.Environment { }
environment.FuncProviders = providers.All()
err := environment.Init(context.Background())
if err != nil { log.Fatal(err) }
// set up the HTTP handler
handler := handler {
environment: &environment,
directories: flagDirectories.Value == "true",
stepExt: ucontainer.NewSet(".step"),
index: []string { "index.step", "index.html", "index" },
}
// set up the HTTP server
httpServer := http.Server {
Addr: flagAddress.Value,
Handler: &handler,
}
// set up the routine manager
httpServerRoutine := httpServerRoutine(httpServer)
manager := routines.Manager {
Routines: []routines.Routine {
&httpServerRoutine,
},
}
log.Println(`.// initialized.`)
ctx, done := context.WithCancel(context.Background())
daemon.OnSigint(done)
log.Printf("(i) listening on %s\n", httpServer.Addr)
if err := manager.Run(ctx); err != nil && !errors.Is(err, context.Canceled) {
log.Fatalln(err)
}
}
type httpServerRoutine http.Server
func (this *httpServerRoutine) Run (ctx context.Context) error {
ctx, done := context.WithCancel(ctx)
defer done()
server := http.Server(*this)
go func () {
<- ctx.Done()
shutdownCtx, _ := context.WithTimeout (
context.Background(),
16 * time.Second)
server.Shutdown(shutdownCtx)
} ()
err := server.ListenAndServe()
if ctx.Err() != nil {
return ctx.Err()
}
return err
}

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package step
import "io"
import "time"
import "strings"
import "html/template"
// Document represents a STEP file.
type Document struct {
Author string
Title string
Extends string
// WORM:
environment *Environment
frontMatter FrontMatter
name string
parseTime time.Time
template *template.Template
}
// Execute executes this document and writes the result to the output. This
// method is safe for concurrent use by multiple goroutines.
func (this *Document) Execute (output io.Writer, data ExecutionData) error {
if this.Extends == "" {
// no parent
return this.template.Execute(output, data)
}
// execute into string builder
outputBuilder := strings.Builder { }
err := this.template.Execute(&outputBuilder, data)
if err != nil { return err }
// execute parent with this document's result
parent, err := this.environment.Parse(this.Extends)
if err != nil { return err }
return parent.Execute(output, ExecutionData {
Data: data.Data,
Child: &ExecutionResult {
Author: this.Author,
Title: this.Title,
Extends: this.Extends,
FrontMatter: this.frontMatter,
Body: template.HTML(outputBuilder.String()),
},
})
}
// ExecutionData is data made available to documents as they are being exeucted.
type ExecutionData struct {
Data any // Custom data
Child *ExecutionResult // The child document's result, if applicable
}
// ExecutionResult is the result of executing a document.
type ExecutionResult struct {
Author string
Title string
Extends string
FrontMatter FrontMatter
Body template.HTML
}

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package step
import "os"
import "io"
import "time"
import "io/fs"
import "context"
import "path/filepath"
import "html/template"
import "git.tebibyte.media/sashakoshka/goutil/sync"
// TODO change Parse to Load, ParseReader to Parse
// Environment is an execution environment for STEP documents. It can parse
// documents into itself and resolve dependencies among them.
type Environment struct {
// FS, if specified, is the filesystem that this environment will load
// documents from. Its methods must be safe for concurrent execution.
FS fs.FS
// FuncProviders is a slice of FuncMap providers whoose functions will
// be available to any documents this environment processes.
FuncProviders []FuncProvider
documents usync.Locker[map[string] *Document]
funcMap template.FuncMap
}
// Init must be called before utilizng the environment.
func (this *Environment) Init (ctx context.Context) error {
this.documents = usync.NewLocker(make(map[string] *Document))
this.funcMap = make(template.FuncMap)
for _, provider := range this.FuncProviders {
funcMap := provider.FuncMap()
if funcMap == nil { continue }
for name, function := range funcMap {
this.funcMap[name] = function
}
}
return ctx.Err()
}
// Parse parses the named document and returns it. The name is treated as a file
// path relative to the current working directory. Documents are cached into the
// environment once parsed, and are returned on subsequent calls that have the
// same name.
func (this *Environment) Parse (name string) (*Document, error) {
name = filepath.Clean(name)
input, err := this.GetFS().Open(name)
if err != nil {
// if the file couldn't be opened, delete from cache in case the
// file was deleted
this.Unload(name)
return nil, err
}
defer input.Close()
info, err := input.Stat()
if err != nil { return nil, err }
return this.parse(name, info.ModTime(), input)
}
// ParseReader is like Parse, but parses a reader and just takes your word for
// it that it corresponds to the file of the given name. It always re-parses.
func (this *Environment) ParseReader (name string, input io.Reader) (*Document, error) {
name = filepath.Clean(name)
return this.parse(name, time.Now(), input)
}
// Unload removes a named document. It will be reloaded if necessary.
func (this *Environment) Unload (name string) {
documents, done := this.documents.Borrow()
defer done()
delete(documents, name)
}
func (this *Environment) parse (name string, modTime time.Time, input io.Reader) (*Document, error) {
documents, done := this.documents.Borrow()
defer done()
// check cache
if document, ok := documents[name]; ok {
if modTime.Before(document.parseTime) {
return document, nil
}
}
// read entire file and split into front matter and body
buffer, err := io.ReadAll(input)
if err != nil { return nil, err }
frontMatter, body, err := SplitFrontMatter(string(buffer))
if err != nil { return nil, err }
// assemble the document struct
document := &Document {
environment: this,
name: name,
parseTime: time.Now(),
frontMatter: frontMatter,
template: template.New(name),
}
if author, ok := frontMatter["author"]; ok {
document.Author = author
}
if title, ok := frontMatter["title"]; ok {
document.Title = title
}
if extends, ok := frontMatter["extends"]; ok {
document.Extends = extends
}
// parse template from the body
document.template.Funcs(this.funcMap)
_, err = document.template.Parse(body)
if err != nil { return nil, err }
// add template functions which need a document pointer for context
for _, provider := range this.FuncProviders {
provider, ok := provider.(FuncProviderFor)
if !ok { continue }
funcMap := provider.FuncMapFor(document)
if funcMap == nil { continue }
for name, function := range funcMap {
this.funcMap[name] = function
}
}
documents[name] = document
return document, nil
}
// GetFS returns the effective filesystem that the environment uses.
func (this *Environment) GetFS () fs.FS {
if this.FS == nil {
return os.DirFS(".")
}
return this.FS
}

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package step
// Error enumerates errors common to this package.
type Error string; const (
ErrCircularInheritance Error = "Circular inheritance"
ErrFrontMatterMalformed Error = "Front matter is malformed"
ErrFrontMatterNeverClosed Error = "Front matter is never closed"
ErrFrontMatterDuplicateKey Error = "Duplicate key in front matter"
)
// Error fulfills the error interface.
func (err Error) Error () string {
return string(err)
}

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frontmatter.go Normal file
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package step
import "strings"
const frontMatterRule = "---"
// FrontMatter represents optional metadata that can occur at the very start of
// a document.
type FrontMatter = map[string] string
// SplitFrontMatter parses the front matter (if it exists), returning a map
// representing it along with the rest of the input as a string. If there is no
// front matter, an empty map will be returned.
func SplitFrontMatter (input string) (FrontMatter, string, error) {
if !strings.HasPrefix(input, frontMatterRule + "\n") {
// no front matter at all
return FrontMatter { }, input, nil
}
input = strings.TrimPrefix(input, frontMatterRule)
index := strings.Index(input, "\n" + frontMatterRule + "\n")
if index < 0 {
return nil, "", ErrFrontMatterNeverClosed
}
frontMatterRaw := input[:index]
body := input[index + len(frontMatterRule) + 2:]
frontMatter := make(FrontMatter)
for _, line := range strings.Split(frontMatterRaw, "\n") {
line = strings.TrimSpace(line)
if line == "" { continue }
key, value, ok := strings.Cut(line, ":")
if !ok {
return nil, "", ErrFrontMatterMalformed
}
key = strings.ToLower(strings.TrimSpace(key))
value = strings.TrimSpace(value)
if key == "" {
return nil, "", ErrFrontMatterMalformed
}
if _, exists := frontMatter[key]; exists {
return nil, "", ErrFrontMatterDuplicateKey
}
frontMatter[key] = value
}
return frontMatter, body, nil
}

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package step
import "testing"
const quickBrownFox = "The quick brown fox jumped over the lazy dog."
func TestSplitFrontMatter (test *testing.T) {
correctBody :=
`this is some sample text
---
theres another hr that shouldnt
break anything
break: anything
`
frontMatter, body, err := SplitFrontMatter(
`---
FOO: baR
fOoo: Bar
Shouldn't break anything: ---
this : that
Sentence: ` + quickBrownFox + `
---
` + correctBody)
if err != nil {
test.Fatal(err)
}
test.Log("BODY:")
test.Log(body)
if body != correctBody {
test.Fatal("body is not correct")
}
test.Log("FRONT MATTER:")
test.Log(frontMatter)
value0, ok := frontMatter["foo"]
if !ok { test.Fatal("missing key") }
value1, ok := frontMatter["fooo"]
if !ok { test.Fatal("missing key") }
value2, ok := frontMatter["shouldn't break anything"]
if !ok { test.Fatal("missing key") }
value3, ok := frontMatter["this"]
if !ok { test.Fatal("missing key") }
value4, ok := frontMatter["sentence"]
if !ok { test.Fatal("missing key") }
if value0 != "baR" { test.Fatal("value is not correct") }
if value1 != "Bar" { test.Fatal("value is not correct") }
if value2 != "---" { test.Fatal("value is not correct") }
if value3 != "that" { test.Fatal("value is not correct") }
if value4 != quickBrownFox { test.Fatal("value is not correct") }
}

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go.mod Normal file
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module git.tebibyte.media/sashakoshka/step
go 1.23.3
require (
git.tebibyte.media/sashakoshka/go-cli v0.1.1
git.tebibyte.media/sashakoshka/go-service v0.1.1
git.tebibyte.media/sashakoshka/goutil v0.6.0
github.com/Masterminds/sprig/v3 v3.3.0
)
require (
dario.cat/mergo v1.0.1 // indirect
github.com/Masterminds/goutils v1.1.1 // indirect
github.com/Masterminds/semver/v3 v3.3.0 // indirect
github.com/google/uuid v1.6.0 // indirect
github.com/huandu/xstrings v1.5.0 // indirect
github.com/mitchellh/copystructure v1.2.0 // indirect
github.com/mitchellh/reflectwalk v1.0.2 // indirect
github.com/shopspring/decimal v1.4.0 // indirect
github.com/spf13/cast v1.7.0 // indirect
golang.org/x/crypto v0.26.0 // indirect
)

49
go.sum Normal file
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@ -0,0 +1,49 @@
dario.cat/mergo v1.0.1 h1:Ra4+bf83h2ztPIQYNP99R6m+Y7KfnARDfID+a+vLl4s=
dario.cat/mergo v1.0.1/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
git.tebibyte.media/sashakoshka/go-cli v0.1.1 h1:g68h/OElSFw82f61oefT6a2n1JqIADdHlTkkw16Uwy0=
git.tebibyte.media/sashakoshka/go-cli v0.1.1/go.mod h1:JFA3wSdRkXxa4iQJWHfe3DokiG7Dh2XUJBzPmuVlbuY=
git.tebibyte.media/sashakoshka/go-service v0.1.1 h1:WhDK532iB3hrVILih2+rJmRtCctXIoj2uEWMm8tU4+E=
git.tebibyte.media/sashakoshka/go-service v0.1.1/go.mod h1:qPtzuqB1psUWZrmy3XTU1dZHHhVNHHP2pSBkpzlTazk=
git.tebibyte.media/sashakoshka/goutil v0.6.0 h1:mJ479aPl8wvL7pdzcTj/y3BvwEXUSp8ygTQoQG1uLKg=
git.tebibyte.media/sashakoshka/goutil v0.6.0/go.mod h1:UF5frNyvtAuaP6JwkbvLqp3DltmDIm9G+ZXU8lP3oVQ=
github.com/Masterminds/goutils v1.1.1 h1:5nUrii3FMTL5diU80unEVvNevw1nH4+ZV4DSLVJLSYI=
github.com/Masterminds/goutils v1.1.1/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
github.com/Masterminds/semver/v3 v3.3.0 h1:B8LGeaivUe71a5qox1ICM/JLl0NqZSW5CHyL+hmvYS0=
github.com/Masterminds/semver/v3 v3.3.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
github.com/Masterminds/sprig/v3 v3.3.0 h1:mQh0Yrg1XPo6vjYXgtf5OtijNAKJRNcTdOOGZe3tPhs=
github.com/Masterminds/sprig/v3 v3.3.0/go.mod h1:Zy1iXRYNqNLUolqCpL4uhk6SHUMAOSCzdgBfDb35Lz0=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/huandu/xstrings v1.5.0 h1:2ag3IFq9ZDANvthTwTiqSSZLjDc+BedvHPAp5tJy2TI=
github.com/huandu/xstrings v1.5.0/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/mitchellh/copystructure v1.2.0 h1:vpKXTN4ewci03Vljg/q9QvCGUDttBOGBIa15WveJJGw=
github.com/mitchellh/copystructure v1.2.0/go.mod h1:qLl+cE2AmVv+CoeAwDPye/v+N2HKCj9FbZEVFJRxO9s=
github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zxSIeXaQ=
github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
github.com/shopspring/decimal v1.4.0 h1:bxl37RwXBklmTi0C79JfXCEBD1cqqHt0bbgBAGFp81k=
github.com/shopspring/decimal v1.4.0/go.mod h1:gawqmDU56v4yIKSwfBSFip1HdCCXN8/+DMd9qYNcwME=
github.com/spf13/cast v1.7.0 h1:ntdiHjuueXFgm5nzDRdOS4yfT43P5Fnud6DH50rz/7w=
github.com/spf13/cast v1.7.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
golang.org/x/crypto v0.26.0 h1:RrRspgV4mU+YwB4FYnuBoKsUapNIL5cohGAmSH3azsw=
golang.org/x/crypto v0.26.0/go.mod h1:GY7jblb9wI+FOo5y8/S2oY4zWP07AkOJ4+jxCqdqn54=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

17
plugin.go Normal file
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package step
import "html/template"
// FuncProvider provides a template.FuncMap.
type FuncProvider interface {
// FuncMap provides a template.FuncMap. It may return nil, in which case
// its result is simply not considered.
FuncMap () template.FuncMap
}
// FuncProviderFor is an object that provides
type FuncProviderFor interface {
// FuncMap provides a template.FuncMap, given a particular document. It
// may return nil, in which case its result is simply not considered.
FuncMapFor (*Document) template.FuncMap
}

13
providers/all.go Normal file
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package providers
import "git.tebibyte.media/sashakoshka/step"
import fpos "git.tebibyte.media/sashakoshka/step/providers/os"
import fpsprig "git.tebibyte.media/sashakoshka/step/providers/sprig"
// All returns a slice of all providers defined in sub-packages.
func All () []step.FuncProvider {
return []step.FuncProvider {
new(fpsprig.Provider),
new(fpos.Provider),
}
}

40
providers/math/math.go Normal file
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package math
import "math"
import "html/template"
import "git.tebibyte.media/sashakoshka/step"
var _ step.FuncProvider = new(Provider)
// Provider provides math functions.
type Provider struct {
}
// FuncMap fulfills the step.FuncProvider interface.
func (this *Provider) FuncMap () template.FuncMap {
return template.FuncMap {
"add": funcAdd,
"sub": funcSub,
"mul": funcMul,
"div": funcDiv,
"pow": math.Pow,
"sqrt": math.Sqrt,
}
}
func funcAdd (a, b float64) float64 {
return a + b
}
func funcSub (a, b float64) float64 {
return a - b
}
func funcMul (a, b float64) float64 {
return a * b
}
func funcDiv (a, b float64) float64 {
return a / b
}

64
providers/os/os.go Normal file
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package os
import "os"
import "io"
import "html/template"
import "git.tebibyte.media/sashakoshka/step"
var _ step.FuncProvider = new(Provider)
// Provider provides OS functions.
type Provider struct {
}
// FuncMap fulfills the step.FuncProvider interface.
func (this *Provider) FuncMap () template.FuncMap {
return template.FuncMap {
"fileExists": funcFileExists,
"readFile": funcReadFile,
"readDir": funcReadDir,
"writeFile": funcWriteFile,
"renameFile": funcRenameFile,
"removeFile": funcRemoveFile,
}
}
func funcFileExists (name string) (bool) {
_, err := os.Stat(name)
return err == nil
}
func funcReadFile (name string) (string, error) {
file, err := os.Open(name)
if err != nil { return "", err }
defer file.Close()
buffer, err := io.ReadAll(file)
if err != nil { return "", err }
return string(buffer), nil
}
func funcReadDir (name string) ([]string, error) {
entries, err := os.ReadDir(name)
if err != nil { return nil, err }
names := make([]string, len(entries))
for index, entry := range entries {
names[index] = entry.Name()
}
return names, nil
}
func funcWriteFile (name, content string) error {
file, err := os.Create(name)
if err != nil { return err }
_, err = io.WriteString(file, content)
return err
}
func funcRenameFile (name, newName string) error {
return os.Rename(name, newName)
}
func funcRemoveFile (name string) error {
return os.Remove(name)
}

17
providers/sprig/sprig.go Normal file
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package sprig
import "html/template"
import "github.com/Masterminds/sprig/v3"
import "git.tebibyte.media/sashakoshka/step"
var _ step.FuncProvider = new(Provider)
// Provider provides all Sprig functions.
type Provider struct {
}
// FuncMap fulfills the step.FuncProvider interface.
func (this *Provider) FuncMap () template.FuncMap {
return sprig.FuncMap()
}