feature: add support for Crystal programming language (#566)

2020-08-31 00:28:50 -03:00
parent 6bcc471f4d
commit b668d7c397
25 changed files with 413 additions and 95 deletions
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -68,3 +68,9 @@ jobs:
        run: |
          docker build -t metrue/fx-julia-base:latest -f ./assets/dockerfiles/base/julia/Dockerfile ./assets/dockerfiles/base/julia
          docker push metrue/fx-julia-base:latest
+
+      - name: build and publish fx crystal image
+        if: always()
+        run: |
+          docker build -t metrue/fx-crystal-base:latest -f ./assets/dockerfiles/base/crystal/Dockerfile ./assets/dockerfiles/base/crystal
+          docker push metrue/fx-crystal-base:latest
--- a/README.md
+++ b/README.md
@@ -36,6 +36,7 @@ Feel free hacking fx to support the languages not listed. Welcome to tweet me [@
 | Julia         | Supported     | [@matbesancon](https://github.com/matbesancon)| [/examples/Julia](https://github.com/metrue/fx/tree/master/examples/functions/Julia) |
 | D             | Supported     | [@andre2007](https://github.com/andre2007)| [/examples/D](https://github.com/metrue/fx/tree/master/examples/functions/D) |
 | Perl          | Supported     | fx            | [/examples/Perl](https://github.com/metrue/fx/tree/master/examples/functions/Perl) |
+| Crystal       | Supported     | [@mvrilo](https://github.com/mvrilo)       | [/examples/Crystal](https://github.com/metrue/fx/tree/master/examples/functions/Crystal) |
 | R             | Working on [need your help](https://github.com/metrue/fx/issues/31)   | ||

 # Installation
--- a/assets/dockerfiles/base/crystal/Dockerfile
+++ b/assets/dockerfiles/base/crystal/Dockerfile
@@ -0,0 +1,7 @@
+FROM crystallang/crystal:latest
+
+WORKDIR /fx
+
+COPY . /fx
+
+RUN shards install
--- a/assets/dockerfiles/base/crystal/shard.lock
+++ b/assets/dockerfiles/base/crystal/shard.lock
@@ -0,0 +1,18 @@
+version: 2.0
+shards:
+  exception_page:
+    git: https://github.com/crystal-loot/exception_page.git
+    version: 0.1.4
+
+  kemal:
+    git: https://github.com/kemalcr/kemal.git
+    version: 0.26.1
+
+  kilt:
+    git: https://github.com/jeromegn/kilt.git
+    version: 0.4.0
+
+  radix:
+    git: https://github.com/luislavena/radix.git
+    version: 0.3.9
+
--- a/assets/dockerfiles/base/crystal/shard.yml
+++ b/assets/dockerfiles/base/crystal/shard.yml
@@ -0,0 +1,6 @@
+name: fx-crystal-base
+version: 0.1.0
+dependencies:
+  kemal:
+    github: kemalcr/kemal
+    commit: a819d4792bbc63d993d6dd2b15f9af5efb0c2d8c
--- a/bundle/bundle.go
+++ b/bundle/bundle.go
@@ -4,6 +4,7 @@ import (
 	"fmt"

 	"github.com/metrue/fx/bundler"
+	"github.com/metrue/fx/bundler/crystal"
 	"github.com/metrue/fx/bundler/d"
 	golang "github.com/metrue/fx/bundler/go"
 	"github.com/metrue/fx/bundler/java"
@@ -37,6 +38,8 @@ func Bundle(workdir string, language string, fn string, deps ...string) error {
 		bundler = ruby.New()
 	case "rust":
 		bundler = rust.New()
+	case "crystal":
+		bundler = crystal.New()
 	default:
 		return fmt.Errorf("%s not suppported yet", language)
 	}
--- a/bundler/crystal/assets/Dockerfile
+++ b/bundler/crystal/assets/Dockerfile
@@ -0,0 +1,9 @@
+FROM metrue/fx-crystal-base
+
+EXPOSE 3000
+
+COPY . .
+
+RUN crystal build --verbose  -o ./fxcr ./*.cr
+
+CMD ["./fxcr"]
--- a/bundler/crystal/assets/app.cr
+++ b/bundler/crystal/assets/app.cr
@@ -0,0 +1,14 @@
+require "kemal"
+require "gzip"
+require "json"
+require "./fx"
+
+post "/" do |ctx|
+    fx ctx
+end
+
+get "/" do |ctx|
+    fx ctx
+end
+
+Kemal.run
--- a/bundler/crystal/assets/fx.cr
+++ b/bundler/crystal/assets/fx.cr
@@ -0,0 +1,3 @@
+def fx(ctx)
+  "hello world"
+end
--- a/bundler/crystal/crystal-packr.go
+++ b/bundler/crystal/crystal-packr.go
@@ -0,0 +1,8 @@
+// +build !skippackr
+// Code generated by github.com/gobuffalo/packr/v2. DO NOT EDIT.
+
+// You can use the "packr clean" command to clean up this,
+// and any other packr generated files.
+package crystal
+
+import _ "github.com/metrue/fx/packrd"
--- a/bundler/crystal/crystal.go
+++ b/bundler/crystal/crystal.go
@@ -0,0 +1,32 @@
+package crystal
+
+import (
+	"github.com/gobuffalo/packr/v2"
+	"github.com/metrue/fx/bundler"
+)
+
+// Crystal defines crystal bundler
+type Crystal struct {
+	assets *packr.Box
+}
+
+// New a crystal bundler
+func New() *Crystal {
+	return &Crystal{
+		assets: packr.New("crystal", "./assets"),
+	}
+}
+
+// Scaffold a crystal/kemal app
+func (k *Crystal) Scaffold(output string) error {
+	return bundler.Restore(k.assets, output)
+}
+
+// Bundle a function into a kemal project
+func (k *Crystal) Bundle(output string, fn string, deps ...string) error {
+	return bundler.Bundle(k.assets, output, "crystal", fn, deps...)
+}
+
+var (
+	_ bundler.Bundler = &Crystal{}
+)
--- a/bundler/crystal/crystal_test.go
+++ b/bundler/crystal/crystal_test.go
@@ -0,0 +1,143 @@
+package crystal
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"reflect"
+	"testing"
+
+	"github.com/metrue/fx/utils"
+)
+
+func TestCrystalBundler(t *testing.T) {
+	t.Run("Scaffold", func(t *testing.T) {
+		outputDir, err := ioutil.TempDir("", "fx_crystal")
+		if err != nil {
+			log.Fatal(err)
+		}
+		defer os.RemoveAll(outputDir)
+
+		crystal := New()
+		if err := crystal.Scaffold(outputDir); err != nil {
+			t.Fatal(err)
+		}
+
+		diff, _, _, err := utils.Diff(outputDir, "./assets")
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if diff {
+			t.Fatalf("%s is not equal with %s", outputDir, "./assets")
+		}
+	})
+
+	t.Run("BundleSingleFunc", func(t *testing.T) {
+		fd, err := ioutil.TempFile("", "fx_func_*.crystal")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.Remove(fd.Name())
+
+		content := `def fx(ctx)
+	"hello world"
+end`
+		err = ioutil.WriteFile(fd.Name(), []byte(content), 0666)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		outputDir, err := ioutil.TempDir("", "fx_crystal")
+		if err != nil {
+			log.Fatal(err)
+		}
+		defer os.RemoveAll(outputDir)
+
+		crystal := New()
+		if err := crystal.Bundle(outputDir, fd.Name()); err != nil {
+			t.Fatal(err)
+		}
+
+		diff, pre, cur, err := utils.Diff("./assets", outputDir)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if !diff {
+			t.Fatalf("handle function should be changed")
+		}
+
+		if !reflect.DeepEqual(cur, []byte(content)) {
+			t.Fatalf("it should be %s but got %s", content, cur)
+		}
+
+		preHandleFunc, err := ioutil.ReadFile("./assets/fx.cr")
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !reflect.DeepEqual(pre, preHandleFunc) {
+			{
+			}
+			t.Fatalf("it should get %s but got %s", preHandleFunc, pre)
+		}
+	})
+
+	t.Run("BundleFuncAndDeps", func(t *testing.T) {
+		fd, err := ioutil.TempFile("", "fx_func_*.cr")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.Remove(fd.Name())
+
+		content, err := ioutil.ReadFile("./assets/fx.cr")
+		if err != nil {
+			t.Fatal(err)
+		}
+		err = ioutil.WriteFile(fd.Name(), content, 0666)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		addFunc := `def fx(a, b)
+	a + b
+end
+`
+		addFd, err := ioutil.TempFile("", "fx_add_func_*.cr")
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		err = ioutil.WriteFile(addFd.Name(), []byte(addFunc), 0644)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		outputDir, err := ioutil.TempDir("", "fx_crystal")
+		if err != nil {
+			log.Fatal(err)
+		}
+		defer os.RemoveAll(outputDir)
+
+		crystal := New()
+		if err := crystal.Bundle(outputDir, fd.Name(), addFd.Name()); err != nil {
+			t.Fatal(err)
+		}
+
+		diff, pre, cur, err := utils.Diff("./assets", outputDir)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if !diff {
+			t.Fatalf("handle function should be changed")
+		}
+
+		if !reflect.DeepEqual(cur, []byte(addFunc)) {
+			t.Fatalf("it should be %s but got %s", content, cur)
+		}
+		if pre != nil {
+			t.Fatal(pre)
+		}
+	})
+}
--- a/constants/constants.go
+++ b/constants/constants.go
@@ -16,6 +16,7 @@ var BaseImages = []string{
 	"metrue/fx-node-base",
 	"metrue/fx-d-base",
 	"metrue/fx-go-base",
+	"metrue/fx-crystal-base",
 }

 // ConfigPath path to config
--- a/constants/languages.go
+++ b/constants/languages.go
@@ -12,4 +12,5 @@ var ExtLangMapping = map[string]string{
 	".d":    "d",
 	".rs":   "rust",
 	".pl":   "perl",
+	".cr":   "crystal",
 }
--- a/container_runtimes/docker/http/asserts/dockerfiles/base/crystal/Dockerfile
+++ b/container_runtimes/docker/http/asserts/dockerfiles/base/crystal/Dockerfile
@@ -0,0 +1,7 @@
+FROM crystallang/crystal:latest
+
+WORKDIR /fx
+
+COPY . /fx
+
+RUN shards install
--- a/container_runtimes/docker/http/asserts/dockerfiles/base/crystal/shard.lock
+++ b/container_runtimes/docker/http/asserts/dockerfiles/base/crystal/shard.lock
@@ -0,0 +1,18 @@
+version: 2.0
+shards:
+  exception_page:
+    git: https://github.com/crystal-loot/exception_page.git
+    version: 0.1.4
+
+  kemal:
+    git: https://github.com/kemalcr/kemal.git
+    version: 0.26.1
+
+  kilt:
+    git: https://github.com/jeromegn/kilt.git
+    version: 0.4.0
+
+  radix:
+    git: https://github.com/luislavena/radix.git
+    version: 0.3.9
+
--- a/container_runtimes/docker/http/asserts/dockerfiles/base/crystal/shard.yml
+++ b/container_runtimes/docker/http/asserts/dockerfiles/base/crystal/shard.yml
@@ -0,0 +1,6 @@
+name: fx-crystal-base
+version: 0.1.0
+dependencies:
+  kemal:
+    github: kemalcr/kemal
+    commit: a819d4792bbc63d993d6dd2b15f9af5efb0c2d8c
--- a/examples/functions/Crystal/README.md
+++ b/examples/functions/Crystal/README.md
@@ -0,0 +1,33 @@
+# Make a Crystal function a service with fx
+
+Write a function like,
+
+```crystal
+def fx(ctx)
+  "hello world, crystal"
+end
+```
+
+then deploy it with `fx up` command,
+
+```shell
+$ fx up -p 8000 func.cr
+```
+
+test it using `curl`
+
+```shell
+$ curl -i localhost:8000
+
+HTTP/1.1 200 OK
+Connection: keep-alive
+X-Powered-By: Kemal
+Content-Type: text/html
+Content-Length: 20
+
+hello world, crystal
+```
+
+### ctx
+
+The `ctx` argument is a Kemal HTTP request / response context [context](https://kemalcr.com/guide/#context)
--- a/examples/functions/Crystal/func.cr
+++ b/examples/functions/Crystal/func.cr
@@ -0,0 +1,3 @@
+def fx(ctx)
+  "hello world, crystal"
+end
--- a/go.sum
+++ b/go.sum
@@ -23,15 +23,8 @@ github.com/VividCortex/ewma v1.1.1 h1:MnEK4VOv6n0RSY4vtRe3h11qjxL3+t0B8yOL8iMXdc
 github.com/VividCortex/ewma v1.1.1/go.mod h1:2Tkkvm3sRDVXaiyucHiACn4cqf7DpdyLvmxzcbUokwA=
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@@ -41,8 +34,6 @@ github.com/aybabtme/rgbterm v0.0.0-20170906152045-cc83f3b3ce59/go.mod h1:q/89r3U
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@@ -218,7 +208,6 @@ github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVc
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@@ -259,8 +248,6 @@ github.com/opencontainers/go-digest v1.0.0-rc1 h1:WzifXhOVOEOuFYOJAW6aQqW0TooG2i
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 github.com/otiai10/copy v1.2.0 h1:HvG945u96iNadPoG2/Ja2+AUJeW5YuFQMixq9yirC+k=
 github.com/otiai10/copy v1.2.0/go.mod h1:rrF5dJ5F0t/EWSYODDu4j9/vEeYHMkc8jt0zJChqQWw=
 github.com/otiai10/curr v0.0.0-20150429015615-9b4961190c95 h1:+OLn68pqasWca0z5ryit9KGfp3sUsW4Lqg32iRMJyzs=
@@ -340,13 +327,11 @@ github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJy
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
-github.com/stretchr/testify v1.6.0 h1:jlIyCplCJFULU/01vCkhKuTyc3OorI3bJFuw6obfgho=
-github.com/stretchr/testify v1.6.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/tj/assert v0.0.0-20171129193455-018094318fb0/go.mod h1:mZ9/Rh9oLWpLLDRpvE+3b7gP/C2YyLFYxNmcLnPTMe0=
+github.com/tj/assert v0.0.3 h1:Df/BlaZ20mq6kuai7f5z2TvPFiwC3xaWJSDQNiIS3Rk=
 github.com/tj/assert v0.0.3/go.mod h1:Ne6X72Q+TB1AteidzQncjw9PabbMp4PBMZ1k+vd1Pvk=
-github.com/tj/go-buffer v1.0.1/go.mod h1:iyiJpfFcR2B9sXu7KvjbT9fpM4mOelRSDTbntVj52Uc=
 github.com/tj/go-buffer v1.1.0/go.mod h1:iyiJpfFcR2B9sXu7KvjbT9fpM4mOelRSDTbntVj52Uc=
 github.com/tj/go-elastic v0.0.0-20171221160941-36157cbbebc2/go.mod h1:WjeM0Oo1eNAjXGDx2yma7uG2XoyRZTq1uv3M/o7imD0=
 github.com/tj/go-kinesis v0.0.0-20171128231115-08b17f58cb1b/go.mod h1:/yhzCV0xPfx6jb1bBgRFjl5lytqVqZXEaeqWP8lTEao=
@@ -430,12 +415,9 @@ golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190616124812-15dcb6c0061f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191128015809-6d18c012aee9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42 h1:vEOn+mP2zCOVzKckCZy6YsCtDblrpj/w7B9nxGNELpg=
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.0.0-20160726164857-2910a502d2bf/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
@@ -473,6 +455,7 @@ gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLks
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
@@ -490,6 +473,7 @@ gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c h1:grhR+C34yXImVGp7EzNk+DTIk+323eIUWOmEevy6bDo=
 gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
@@ -512,10 +496,6 @@ k8s.io/kube-openapi v0.0.0-20190816220812-743ec37842bf/go.mod h1:1TqjTSzOxsLGIKf
 k8s.io/utils v0.0.0-20190920012459-5008bf6f8cd6/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
 k8s.io/utils v0.0.0-20190923111123-69764acb6e8e h1:BXSmdH6S3YGLlhC89DZp+sNdYSmwNeDU6Xu5ZpzGOlM=
 k8s.io/utils v0.0.0-20190923111123-69764acb6e8e/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
-rsc.io/quote/v3 v3.1.0 h1:9JKUTTIUgS6kzR9mK1YuGKv6Nl+DijDNIc0ghT58FaY=
-rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
-rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
-rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
--- a/packer/rules.go
+++ b/packer/rules.go
@@ -17,6 +17,7 @@ var ExtLangMapping = map[string]string{
 	".d":    "d",
 	".rs":   "rust",
 	".pl":   "perl",
+	".cr":   "crystal",
 }

 func langFromFileName(fileName string) (string, error) {
--- a/packer/rules_test.go
+++ b/packer/rules_test.go
@@ -47,6 +47,10 @@ func TestLangFromFileName(t *testing.T) {
 			name: "a.pl",
 			lang: "perl",
 		},
+		{
+			name: "a.cr",
+			lang: "crystal",
+		},
 	}

 	for _, c := range cases {
--- a/packrd/packed-packr.go
+++ b/packrd/packed-packr.go
--- a/test/functions/func.cr
+++ b/test/functions/func.cr
@@ -0,0 +1,3 @@
+def fx(ctx)
+  "hello world"
+end
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -265,6 +265,7 @@ func GetLangFromFileName(fileName string) (lang string) {
 		".java": "java",
 		".d":    "d",
 		".rs":   "rust",
+		".cr":   "crystal",
 	}
 	return extLangMap[filepath.Ext(fileName)]
 }