Add viewer package

go.mod

@@ -4,6 +4,7 @@ go 1.18
 
 require (
 	github.com/PuerkitoBio/goquery v1.8.0
+	github.com/RyanCarrier/dijkstra v1.1.0
 	github.com/ajg/form v1.5.2-0.20200323032839-9aeb3cf462e1
 	github.com/aybabtme/rgbterm v0.0.0-20170906152045-cc83f3b3ce59
 	github.com/bep/debounce v1.2.1
@@ -18,6 +19,7 @@ require (
 	github.com/keegancsmith/rpc v1.3.0
 	github.com/lithammer/dedent v1.1.0
 	github.com/livebud/bud-test-plugin v0.0.9
+	github.com/livebud/js v0.0.0-20221112072017-b9e63b92aad5
 	github.com/livebud/transpiler v0.0.3
 	github.com/matthewmueller/diff v0.0.0-20220104030700-cb2fe910d90c
 	github.com/matthewmueller/gotext v0.0.0-20210424201144-265ed61725ac
@@ -39,9 +41,11 @@ require (
 
 require (
 	github.com/BurntSushi/toml v0.4.1 // indirect
-	github.com/RyanCarrier/dijkstra v1.1.0 // indirect
 	github.com/andybalholm/cascadia v1.3.1 // indirect
+	github.com/dlclark/regexp2 v1.7.0 // indirect
+	github.com/dop251/goja v0.0.0-20220730095050-d11430fb5f72 // indirect
 	github.com/gedex/inflector v0.0.0-20170307190818-16278e9db813 // indirect
+	github.com/go-sourcemap/sourcemap v2.1.3+incompatible // indirect
 	github.com/google/go-cmp v0.5.6 // indirect
 	github.com/kr/pretty v0.3.0 // indirect
 	github.com/kr/text v0.2.0 // indirect
@@ -54,6 +58,7 @@ require (
 	golang.org/x/exp/typeparams v0.0.0-20220218215828-6cf2b201936e // indirect
 	golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f // indirect
 	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect
+	golang.org/x/text v0.3.7 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 	mvdan.cc/gofumpt v0.2.0 // indirect
 )

go.sum

@@ -24,6 +24,14 @@ github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ3
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 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/dlclark/regexp2 v1.4.1-0.20201116162257-a2a8dda75c91/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
+github.com/dlclark/regexp2 v1.7.0 h1:7lJfhqlPssTb1WQx4yvTHN0uElPEv52sbaECrAQxjAo=
+github.com/dlclark/regexp2 v1.7.0/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
+github.com/dop251/goja v0.0.0-20211022113120-dc8c55024d06/go.mod h1:R9ET47fwRVRPZnOGvHxxhuZcbrMCuiqOz3Rlrh4KSnk=
+github.com/dop251/goja v0.0.0-20220730095050-d11430fb5f72 h1:Q4Q/b1gCC2X1b+/RRhZPTcWlJoNE9DpMKt1etq6erWU=
+github.com/dop251/goja v0.0.0-20220730095050-d11430fb5f72/go.mod h1:1jWwHOtOkEqsfX6tYsufUc7BBTuGHH2ekiJabpkN4CA=
+github.com/dop251/goja_nodejs v0.0.0-20210225215109-d91c329300e7/go.mod h1:hn7BA7c8pLvoGndExHudxTDKZ84Pyvv+90pbBjbTz0Y=
+github.com/dop251/goja_nodejs v0.0.0-20211022123610-8dd9abb0616d/go.mod h1:DngW8aVqWbuLRMHItjPUyqdj+HWPvnQe8V8y1nDpIbM=
 github.com/evanw/esbuild v0.14.11 h1:bw50N4v70Dqf/B6Wn+3BM6BVttz4A6tHn8m8Ydj9vxk=
 github.com/evanw/esbuild v0.14.11/go.mod h1:GG+zjdi59yh3ehDn4ZWfPcATxjPDUH53iU4ZJbp7dkY=
 github.com/fatih/structtag v1.2.0 h1:/OdNE99OxoI/PqaW/SuSK9uxxT3f/tcSZgon/ssNSx4=
@@ -38,6 +46,8 @@ github.com/gitchander/permutation v0.0.0-20201214100618-1f3e7285f953 h1:+rJDfq6w
 github.com/gitchander/permutation v0.0.0-20201214100618-1f3e7285f953/go.mod h1:lP+DW8LR6Rw3ru9Vo2/y/3iiLaLWmofYql/va+7zJOk=
 github.com/go-logfmt/logfmt v0.5.1 h1:otpy5pqBCBZ1ng9RQ0dPu4PN7ba75Y/aA+UpowDyNVA=
 github.com/go-logfmt/logfmt v0.5.1/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
+github.com/go-sourcemap/sourcemap v2.1.3+incompatible h1:W1iEw64niKVGogNgBN3ePyLFfuisuzeidWPMPWmECqU=
+github.com/go-sourcemap/sourcemap v2.1.3+incompatible/go.mod h1:F8jJfvm2KbVjc5NqelyYJmf/v5J0dwNLS2mL4sNA1Jg=
 github.com/gobwas/glob v0.2.3 h1:A4xDbljILXROh+kObIiy5kIaPYD8e96x1tgBhUI5J+Y=
 github.com/gobwas/glob v0.2.3/go.mod h1:d3Ez4x06l9bZtSvzIay5+Yzi0fmZzPgnTbPcKjJAkT8=
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
@@ -66,6 +76,8 @@ github.com/livebud/bud-test-nested-plugin v0.0.5 h1:MpPp20Gng0F+Kvl+L9kttu6nsJIY
 github.com/livebud/bud-test-nested-plugin v0.0.5/go.mod h1:M3QujkGG4ggZ6h75t5zF8MEJFrLTwa2USeIYHQdO2YQ=
 github.com/livebud/bud-test-plugin v0.0.9 h1:JmS4aj+NV52RUroteLs+ld6rcbkBwio7p9qPNutTsqM=
 github.com/livebud/bud-test-plugin v0.0.9/go.mod h1:GTxMZ8W4BIyGIOgAA4hvPHMDDTkaZtfcuhnOcSu3y8M=
+github.com/livebud/js v0.0.0-20221112072017-b9e63b92aad5 h1:7fYJMOnT4WrnjRhJ8B6HiJBGcDVFd9jam0205gn9y1k=
+github.com/livebud/js v0.0.0-20221112072017-b9e63b92aad5/go.mod h1:TDkks+mVAlB96mxcbIAftAxpGteCxoBYGVF1JThjcLk=
 github.com/livebud/transpiler v0.0.3 h1:OFKPsmfTOywBDoOE/ZFMVjAupk/xVXFlXoAgZNRhh5Q=
 github.com/livebud/transpiler v0.0.3/go.mod h1:vQYMN//Y2cnM55tw0lOmLGbEETugP7alxTyhQHzNdTI=
 github.com/matryer/is v1.4.0 h1:sosSmIWwkYITGrxZ25ULNDeKiMNzFSr4V/eqBQP0PeE=
@@ -153,6 +165,7 @@ golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
@@ -167,9 +180,12 @@ golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8T
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=

package/es/es.go

@@ -11,16 +11,24 @@ import (
 	"github.com/livebud/bud/package/log"
 )
 
-func New(flag *framework.Flag, log log.Log, module *gomod.Module) *Builder {
-	return &Builder{flag, module}
+type Builder interface {
+	Serve(serve *Serve) (*File, error)
+	Bundle(bundle *Bundle) ([]File, error)
 }
 
-type Builder struct {
+func New(flag *framework.Flag, log log.Log, module *gomod.Module) Builder {
+	return &builder{flag, module}
+}
+
+type builder struct {
 	flag   *framework.Flag
 	module *gomod.Module
 }
 
+var _ Builder = (*builder)(nil)
+
 type File = esbuild.OutputFile
+type Plugin = esbuild.Plugin
 
 type Platform uint8
 
@@ -35,7 +43,7 @@ type Serve struct {
 	Platform Platform
 }
 
-func (b *Builder) serveOptions(serve *Serve) esbuild.BuildOptions {
+func (b *builder) serveOptions(serve *Serve) esbuild.BuildOptions {
 	switch serve.Platform {
 	case DOM:
 		return b.dom([]string{serve.Entry}, serve.Plugins)
@@ -46,7 +54,7 @@ func (b *Builder) serveOptions(serve *Serve) esbuild.BuildOptions {
 
 var ErrNotRelative = fmt.Errorf("es: entry must be relative")
 
-func (b *Builder) Serve(serve *Serve) (*File, error) {
+func (b *builder) Serve(serve *Serve) (*File, error) {
 	if !isRelativeEntry(serve.Entry) {
 		return nil, fmt.Errorf("%w %q", ErrNotRelative, serve.Entry)
 	}
@@ -75,7 +83,7 @@ type Bundle struct {
 	Platform Platform
 }
 
-func (b *Builder) bundleOptions(bundle *Bundle) esbuild.BuildOptions {
+func (b *builder) bundleOptions(bundle *Bundle) esbuild.BuildOptions {
 	switch bundle.Platform {
 	case DOM:
 		return b.dom(bundle.Entries, bundle.Plugins)
@@ -84,7 +92,7 @@ func (b *Builder) bundleOptions(bundle *Bundle) esbuild.BuildOptions {
 	}
 }
 
-func (b *Builder) Bundle(bundle *Bundle) ([]File, error) {
+func (b *builder) Bundle(bundle *Bundle) ([]File, error) {
 	for _, entry := range bundle.Entries {
 		if !isRelativeEntry(entry) {
 			return nil, fmt.Errorf("%w %q", ErrNotRelative, entry)
@@ -108,7 +116,7 @@ const outDir = "./"
 const globalName = "bud"
 
 // SSR creates a server-rendered preset
-func (b *Builder) ssr(entries []string, plugins []esbuild.Plugin) esbuild.BuildOptions {
+func (b *builder) ssr(entries []string, plugins []esbuild.Plugin) esbuild.BuildOptions {
 	options := esbuild.BuildOptions{
 		EntryPoints:   entries,
 		Plugins:       plugins,
@@ -129,7 +137,7 @@ func (b *Builder) ssr(entries []string, plugins []esbuild.Plugin) esbuild.BuildO
 }
 
 // DOM creates a dom-rendered preset
-func (b *Builder) dom(entries []string, plugins []esbuild.Plugin) esbuild.BuildOptions {
+func (b *builder) dom(entries []string, plugins []esbuild.Plugin) esbuild.BuildOptions {
 	options := esbuild.BuildOptions{
 		EntryPoints:   entries,
 		Plugins:       plugins,

package/transpiler/transpiler.go

@@ -0,0 +1,222 @@
+package transpiler
+
+import (
+	"errors"
+	"fmt"
+	"path/filepath"
+	"sort"
+	"strings"
+	"sync"
+
+	"github.com/RyanCarrier/dijkstra"
+)
+
+// ErrNoPath is returned when there is no path between two extensions.
+var ErrNoPath = dijkstra.ErrNoPath
+
+type File struct {
+	base string
+	ext  string
+	Data []byte
+}
+
+// Path returns the current file path that's being transpiled.
+func (f *File) Path() string {
+	return f.base + f.ext
+}
+
+// Interface for transpiling and testing if you can transpile from one extension
+// to another. This interface is read-only. If you'd like to add extensions, use
+// the Transpiler struct.
+type Interface interface {
+	Best(fromExt string, accepts []string) (string, error)
+	Transpile(fromPath, toExt string, code []byte) ([]byte, error)
+}
+
+func New() *Transpiler {
+	return &Transpiler{
+		ids:   map[string]int{},
+		exts:  map[int]string{},
+		fns:   map[string][]func(file *File) error{},
+		graph: dijkstra.NewGraph(),
+	}
+}
+
+// Transpiler is a generic multi-step tool for transpiling code from one
+// language to another.
+type Transpiler struct {
+	ids  map[string]int                      // ext -> id
+	exts map[int]string                      // id -> ext
+	fns  map[string][]func(file *File) error // map["ext>ext"][]fns
+
+	mu    sync.RWMutex
+	graph *dijkstra.Graph
+}
+
+var _ Interface = (*Transpiler)(nil)
+
+// edgekey returns a key for the edge between two extensions.
+// (e.g. edgeKey("svelte", "html") => "svelte>html")
+func edgeKey(fromExt, toExt string) string {
+	return fromExt + ">" + toExt
+}
+
+// Add a tranpile function to go from one extension to another.
+func (t *Transpiler) Add(fromExt, toExt string, transpile func(file *File) error) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	t.add(fromExt, toExt, transpile)
+}
+
+func (t *Transpiler) add(fromExt, toExt string, transpile func(file *File) error) {
+	// Add the "from" extension to the graph
+	if _, ok := t.ids[fromExt]; !ok {
+		id := len(t.ids)
+		t.ids[fromExt] = id
+		t.exts[id] = fromExt
+		t.graph.AddVertex(id)
+	}
+	edge := edgeKey(fromExt, toExt)
+	// If the "from" and "to" extensions are the same, add the function and return
+	if fromExt == toExt {
+		t.fns[edge] = append(t.fns[edge], transpile)
+		return
+	}
+	// Add the "to" extension to the graph
+	if _, ok := t.ids[toExt]; !ok {
+		id := len(t.ids)
+		t.ids[toExt] = id
+		t.exts[id] = toExt
+		t.graph.AddVertex(id)
+	}
+	// Add the edge with a cost of 1
+	t.graph.AddArc(t.ids[fromExt], t.ids[toExt], 1)
+	// Add the function to a list of transpilers
+	t.fns[edge] = append(t.fns[edge], transpile)
+}
+
+func (t *Transpiler) Path(fromExt, toExt string) (hops []string, err error) {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	return t.path(fromExt, toExt)
+}
+
+// Best returns the best extension to transpile to from the given extension
+func (t *Transpiler) Best(fromExt string, accepts []string) (toExt string, err error) {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	return t.best(fromExt, accepts)
+}
+
+// Candidate is a candidate extension we can transpile to with the number of
+// hops it would take to get there.
+// type candidate struct {
+// 	Ext  string
+// 	Hops int
+// }
+
+func (t *Transpiler) best(fromExt string, accepts []string) (string, error) {
+	fromID, ok := t.ids[fromExt]
+	if !ok {
+		return "", fmt.Errorf("transpiler: %w for %q", ErrNoPath, fromExt)
+	}
+	buckets := map[int][]string{}
+	for _, id := range t.ids {
+		if id == fromID {
+			continue
+		}
+		best, err := t.graph.Shortest(fromID, id)
+		if err != nil {
+			if errors.Is(err, ErrNoPath) {
+				continue
+			}
+			return "", fmt.Errorf("transpiler: unable to get shorted path for %q. %w", fromExt, err)
+		}
+		distance := int(best.Distance)
+		buckets[distance] = append(buckets[distance], t.exts[id])
+	}
+	distances := []int{}
+	for distance := range buckets {
+		distances = append(distances, distance)
+	}
+	sort.Ints(distances)
+	hops := [][]string{}
+	for _, distance := range distances {
+		hops = append(hops, buckets[distance])
+	}
+	// Within each hop bucket, look for the most acceptable extension
+	for _, exts := range hops {
+		for _, accept := range accepts {
+			for _, ext := range exts {
+				if ext == accept {
+					return ext, nil
+				}
+			}
+		}
+	}
+	return "", fmt.Errorf("transpiler: no acceptable path for %q. %w", fromExt, ErrNoPath)
+}
+
+// Path to go from one extension to another.
+func (t *Transpiler) path(fromExt, toExt string) (hops []string, err error) {
+	if fromExt == toExt {
+		return []string{fromExt}, nil
+	}
+	if _, ok := t.ids[fromExt]; !ok {
+		return nil, fmt.Errorf("transpiler: %w from %q to %q", ErrNoPath, fromExt, toExt)
+	}
+	if _, ok := t.ids[toExt]; !ok {
+		return nil, fmt.Errorf("transpiler: %w from %q to %q", ErrNoPath, fromExt, toExt)
+	}
+	best, err := t.graph.Shortest(t.ids[fromExt], t.ids[toExt])
+	if err != nil {
+		return nil, fmt.Errorf("transpiler: %w", err)
+	}
+	for _, id := range best.Path {
+		hops = append(hops, t.exts[id])
+	}
+	return hops, nil
+}
+
+func (t *Transpiler) Transpile(fromPath, toExt string, code []byte) ([]byte, error) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	return t.transpile(fromPath, toExt, code)
+}
+
+// Transpile the code from one extension to another.
+func (t *Transpiler) transpile(fromPath, toExt string, code []byte) ([]byte, error) {
+	fromExt := filepath.Ext(fromPath)
+	// Find the shortest path
+	hops, err := t.path(fromExt, toExt)
+	if err != nil {
+		return nil, err
+	}
+	// Create the file
+	file := &File{
+		base: strings.TrimSuffix(fromPath, filepath.Ext(fromPath)),
+		ext:  fromExt,
+		Data: code,
+	}
+	// For each hop run the functions
+	for i, ext := range hops {
+		// Call the transition functions (e.g. svelte => html)
+		if i > 0 {
+			prevExt := hops[i-1]
+			edge := edgeKey(prevExt, ext)
+			for _, fn := range t.fns[edge] {
+				if err := fn(file); err != nil {
+					return nil, err
+				}
+			}
+		}
+		file.ext = ext
+		// Call the loops (e.g. svelte => svelte)
+		for _, fn := range t.fns[edgeKey(ext, ext)] {
+			if err := fn(file); err != nil {
+				return nil, err
+			}
+		}
+	}
+	return file.Data, nil
+}