add output format option

README.md

@@ -25,3 +25,12 @@ $ expiration-check certificates -d example.com -d other-example.com -d mail.exam
 | mail.example.com  | XXX  | YYYY-MM-DD HH:MM:SS |
 +-------------------+------+---------------------+
 ```
+
+You can specify an ouput format using `--format` or `-f`:
+
+- `table` (default)
+- `json`
+- `csv`
+- `tsv`
+- `html`
+- `markdown`

app.go

@@ -6,12 +6,32 @@ import (
 	"gitnet.fr/deblan/expiration-check/render"
 )
 
+func NormalizeFormat(format string) string {
+	formats := []string{"json", "table", "csv", "tsv", "html", "markdown"}
+
+	for _, f := range formats {
+		if f == format {
+			return f
+		}
+	}
+
+	return "table"
+}
+
 func App() *cli.App {
 	flags := []cli.Flag{
 		&cli.StringSliceFlag{
 			Name:     "domain",
 			Aliases:  []string{"d"},
 			Required: true,
+			Usage:    "list of domains",
+		},
+		&cli.StringFlag{
+			Name:     "format",
+			Aliases:  []string{"f"},
+			Required: false,
+			Value:    "table",
+			Usage:    "output format: table, csv, tsv, html, json, markdown",
 		},
 	}
 
@@ -23,7 +43,11 @@ func App() *cli.App {
 				Usage:   "Checks certificate",
 				Flags:   flags,
 				Action: func(c *cli.Context) error {
-					render.Render(checker.CheckCertificates(c.StringSlice("domain")), 30, 14)
+					render.Render(
+						checker.CheckCertificates(c.StringSlice("domain")),
+						30, 14,
+						NormalizeFormat(c.String("format")),
+					)
 
 					return nil
 				},
@@ -34,7 +58,11 @@ func App() *cli.App {
 				Aliases: []string{"d", "domains"},
 				Flags:   flags,
 				Action: func(c *cli.Context) error {
-					render.Render(checker.CheckDomains(c.StringSlice("domain")), 30, 14)
+					render.Render(
+						checker.CheckDomains(c.StringSlice("domain")),
+						30, 14,
+						NormalizeFormat(c.String("format")),
+					)
 
 					return nil
 				},

checker/struct.go

@@ -1,8 +1,8 @@
 package checker
 
 type Domain struct {
-	Name     string
-	DaysLeft float64
-	Date     string
-	Failed   bool
+	Name     string  `json:"name"`
+	DaysLeft float64 `json:"days"`
+	Date     string  `json:"date"`
+	Failed   bool    `json:"failed"`
 }

render/render.go

@@ -1,6 +1,8 @@
 package render
 
 import (
+	"encoding/json"
+	"fmt"
 	"os"
 	"sort"
 
@@ -9,7 +11,15 @@ import (
 	"gitnet.fr/deblan/expiration-check/checker"
 )
 
-func Render(values []checker.Domain, warning, danger float64) {
+func RenderColor(value string, c text.Colors, format string) string {
+	if format != "table" {
+		return value
+	}
+
+	return c.Sprint(value)
+}
+
+func Render(values []checker.Domain, warning, danger float64, format string) {
 	sort.SliceStable(values, func(i, j int) bool {
 		if values[i].Failed && values[j].Failed {
 			return values[i].Name < values[j].Name
@@ -26,12 +36,19 @@ func Render(values []checker.Domain, warning, danger float64) {
 		return values[i].DaysLeft < values[j].DaysLeft
 	})
 
+	if format == "json" {
+		data, _ := json.Marshal(&values)
+		os.Stdout.Write(data)
+
+		return
+	}
+
 	t := table.NewWriter()
 	t.SetOutputMirror(os.Stdout)
 	t.AppendHeader(table.Row{
-		text.Colors{0, text.FgCyan}.Sprint("Domain"),
-		text.Colors{0, text.FgCyan}.Sprint("Days"),
-		text.Colors{0, text.FgCyan}.Sprint("Date"),
+		RenderColor("Domain", text.Colors{0, text.FgCyan}, format),
+		RenderColor("Days", text.Colors{0, text.FgCyan}, format),
+		RenderColor("Date", text.Colors{0, text.FgCyan}, format),
 	})
 	t.SetColumnConfigs([]table.ColumnConfig{
 		{Number: 2, Align: text.AlignRight},
@@ -39,25 +56,23 @@ func Render(values []checker.Domain, warning, danger float64) {
 	})
 
 	for _, value := range values {
+		failed := RenderColor("FAIL", text.Colors{0, text.FgRed}, format)
+
 		if value.Failed {
-			t.AppendRow(table.Row{
-				value.Name,
-				text.Colors{0, text.FgRed}.Sprint("FAIL"),
-				text.Colors{0, text.FgRed}.Sprint("FAIL"),
-			}, table.RowConfig{})
+			t.AppendRow(table.Row{value.Name, failed, failed}, table.RowConfig{})
 		} else {
 			var days string
 			var date string
 
 			if value.DaysLeft <= danger {
-				days = text.Colors{0, text.FgRed}.Sprint("FAIL")
-				date = text.Colors{0, text.FgRed}.Sprint("FAIL")
+				days = failed
+				date = failed
 			} else if value.DaysLeft <= warning {
-				days = text.Colors{0, text.FgYellow}.Sprint(value.DaysLeft)
-				date = text.Colors{0, text.FgYellow}.Sprint(value.Date)
+				days = RenderColor(fmt.Sprintf("%.0f", value.DaysLeft), text.Colors{0, text.FgYellow}, format)
+				date = RenderColor(value.Date, text.Colors{0, text.FgYellow}, format)
 			} else {
-				days = text.Colors{0, text.FgGreen}.Sprint(value.DaysLeft)
-				date = text.Colors{0, text.FgGreen}.Sprint(value.Date)
+				days = RenderColor(fmt.Sprintf("%.0f", value.DaysLeft), text.Colors{0, text.FgGreen}, format)
+				date = RenderColor(value.Date, text.Colors{0, text.FgGreen}, format)
 			}
 
 			t.AppendRow(table.Row{
@@ -68,5 +83,15 @@ func Render(values []checker.Domain, warning, danger float64) {
 		}
 	}
 
-	t.Render()
+	if format == "table" {
+		t.Render()
+	} else if format == "csv" {
+		t.RenderCSV()
+	} else if format == "html" {
+		t.RenderHTML()
+	} else if format == "tsv" {
+		t.RenderTSV()
+	} else if format == "markdown" {
+		t.RenderMarkdown()
+	}
 }