feat: add funcs: date, mdlink, number, base64 (#9)

* feat: add funcs: date, mdlink, number, base64

* debug(gha): update action image

* fix: parsing date argument, support timezones

* chore: prepare for merge

* chore: update README.md

README.md

@@ -14,10 +14,26 @@ GitHub Action to render file based on template and passed variables.
 | vars        | Variables to use in template (in YAML format) | false    |
 | vars_path   | Path to YAML file with variables              | false    |
 | result_path | Desired path to result file                   | false    |
+| timezone    | Timezone to use in `date` template function   | false    |
 
 You must set at least `vars` or `vars_path`.  
 You may set both of them (`vars` values will precede over `vars_path`).
 
+There are few template functions available:
+
+- `date` – formats timestamp using Go's [time layout](https://golang.org/pkg/time/#pkg-constants).  
+  Example: `{{ "2023-05-11T01:42:04Z" | date "2006-01-02" }}` will be rendered as `2023-05-11`.  
+  You may use `timezone` input to set timezone for `date` function (e.g. `timezone: "America/New_York"`).
+
+- `mdlink` – creates markdown link.  
+  Example: `{{ "https://github.com" | mdlink "GitHub" }}` will be rendered as `[GitHub](https://github.com)`.
+
+- `number` – formats number in English locale.  
+  Example: `{{ 1234567890 | number }}` will be rendered as `1,234,567,890`.
+
+- `base64` – encodes string to base64.  
+  Example: `{{ "hello" | base64 }}` will be rendered as `aGVsbG8=`.
+
 ## Outputs
 
 | Name   | Description           |
@@ -74,7 +90,7 @@ jobs:
 
       - name: Render template
         id: render_template
-        uses: chuhlomin/render-template@v1.6
+        uses: chuhlomin/render-template@v1.7
         with:
           template: kube.template.yml
           vars: |

action.yml

@@ -24,10 +24,14 @@ inputs:
     description: Desired path to result file (optional)
     required: false
 
+  timezone:
+    description: Timezone to use in `date` template function
+    required: false
+
 outputs:
   result:
     description: Rendered file content
 
 runs:
   using: docker
-  image: 'docker://chuhlomin/render-template:v1.6'
+  image: 'docker://chuhlomin/render-template:v1.7'

go.mod

@@ -4,5 +4,6 @@ go 1.17
 
 require (
 	github.com/caarlos0/env/v6 v6.9.2
+	golang.org/x/text v0.9.0
 	gopkg.in/yaml.v3 v3.0.0
 )

go.sum

@@ -1,5 +1,37 @@
 github.com/caarlos0/env/v6 v6.9.2 h1:vYTmP7KPtHf3LqaQH5Z2AkUY8GmanDrTelXnFzxSK44=
 github.com/caarlos0/env/v6 v6.9.2/go.mod h1:hvp/ryKXKipEkcuYjs9mI4bBCg+UI0Yhgm5Zu0ddvwc=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+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=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0 h1:hjy8E9ON/egN1tAYqKb61G10WtihqetD4sz2H+8nIeA=

main.go

@@ -2,13 +2,20 @@ package main
 
 import (
 	"bytes"
+	"encoding/base64"
 	"errors"
 	"fmt"
+	"log"
 	"os"
 	"reflect"
+	"strconv"
 	"text/template"
+	"time"
+	_ "time/tzdata"
 
 	"github.com/caarlos0/env/v6"
+	"golang.org/x/text/language"
+	"golang.org/x/text/message"
 	"gopkg.in/yaml.v3"
 )
 
@@ -91,6 +98,53 @@ func mergeVars(a, b vars) vars {
 	return a
 }
 
+var funcMap = template.FuncMap{
+	"date": func(format string, in interface{}) string {
+		var t time.Time
+		switch v := in.(type) {
+		case string:
+			var err error
+			t, err = time.Parse(time.RFC3339, v)
+			if err != nil {
+				log.Printf("failed to parse date %q: %v", v, err)
+				return v
+			}
+		case time.Time:
+			t = v
+		default:
+			log.Printf("unsupported type %T for date", in)
+			return fmt.Sprintf("%v", in)
+		}
+
+		timezone := os.Getenv("INPUT_TIMEZONE")
+		if timezone != "" {
+			loc, err := time.LoadLocation(timezone)
+			if err != nil {
+				log.Printf("failed to load timezone %q: %v", timezone, err)
+				return in.(string)
+			}
+			t = t.In(loc)
+		}
+
+		return t.Format(format)
+	},
+	"mdlink": func(text, url string) string {
+		return fmt.Sprintf("[%s](%s)", text, url)
+	},
+	"number": func(in string) string {
+		p := message.NewPrinter(language.English)
+		d, err := strconv.ParseInt(in, 10, 64)
+		if err != nil {
+			log.Printf("failed to parse number %q: %v", in, err)
+			return in
+		}
+		return p.Sprintf("%d", d)
+	},
+	"base64": func(in string) string {
+		return base64.StdEncoding.EncodeToString([]byte(in))
+	},
+}
+
 func renderTemplate(templateFilePath string, vars vars) (string, error) {
 	b, err := os.ReadFile(templateFilePath)
 	if err != nil {
@@ -103,7 +157,11 @@ func renderTemplate(templateFilePath string, vars vars) (string, error) {
 		return "", fmt.Errorf("failed to read template %q: %v", templateFilePath, err)
 	}
 
-	tmpl, err := template.New(templateFilePath).Option("missingkey=error").Parse(string(b))
+	tmpl, err := template.
+		New(templateFilePath).
+		Option("missingkey=error").
+		Funcs(funcMap).
+		Parse(string(b))
 	if err != nil {
 		return "", err
 	}

main_test.go

@@ -3,8 +3,10 @@ package main
 import (
 	"encoding/json"
 	"errors"
+	"os"
 	"reflect"
 	"testing"
+	"time"
 )
 
 func TestFormatOutput(t *testing.T) {
@@ -145,8 +147,18 @@ func TestRenderTemplate(t *testing.T) {
 			nil,
 			"Hello text+text\n",
 		},
+		{
+			"./testdata/funcs.txt",
+			map[string]interface{}{
+				"time": time.Date(2023, time.August, 6, 15, 8, 28, 0, time.UTC),
+			},
+			nil,
+			"06 Aug 2023 11:08:28\n06 Aug 2023 11:08:28\n[download](https://github.com)\n1,000\nQUJD\n",
+		},
 	}
 
+	os.Setenv("INPUT_TIMEZONE", "America/New_York")
+
 	for _, tt := range tests {
 		output, err := renderTemplate(tt.templateFilePath, tt.vars)
 		if err != nil {

testdata/funcs.txt

@@ -0,0 +1,5 @@
+{{ .time | date "02 Jan 2006 15:04:05" }}
+{{ "2023-08-06T15:08:28Z" | date "02 Jan 2006 15:04:05" }}
+{{ "https://github.com" | mdlink "download" }}
+{{ "1000" | number }}
+{{ "ABC" | base64 }}