add support for template output mode with new option --templage <tmpl> (#47)

lib/printer.go

@@ -25,8 +25,10 @@ import (
 	"log"
 	"strconv"
 	"strings"
+	"text/template"
 
 	"codeberg.org/scip/tablizer/cfg"
+	"github.com/Masterminds/sprig/v3"
 	"github.com/gookit/color"
 	"github.com/olekukonko/tablewriter"
 	"github.com/olekukonko/tablewriter/renderer"
@@ -66,6 +68,8 @@ func printData(writer io.Writer, conf cfg.Config, data *Tabdata) {
 		printJsonData(writer, data)
 	case cfg.CSV:
 		printCSVData(writer, conf, data)
+	case cfg.Template:
+		printTemplateData(writer, conf, data)
 	default:
 		printASCIIData(writer, conf, data)
 	}
@@ -388,3 +392,25 @@ func printCSVData(writer io.Writer, conf cfg.Config, data *Tabdata) {
 		log.Fatal(err)
 	}
 }
+
+func printTemplateData(writer io.Writer, conf cfg.Config, data *Tabdata) {
+	tmpl, err := template.New("printer").Funcs(sprig.TxtFuncMap()).Parse(conf.Template)
+	if err != nil {
+		log.Fatalf("failed to parse template: %s", err)
+	}
+
+	buf := strings.Builder{}
+
+	for line, dict := range data.ToMap() {
+		err = tmpl.Execute(&buf, dict)
+		if err != nil {
+			log.Fatalf("failed to execute template in line %d: %s", line, err)
+		}
+
+		buf.WriteString("\n")
+	}
+
+	if _, err := fmt.Fprintln(writer, buf.String()); err != nil {
+		log.Fatalf("failed to print output: %s", err)
+	}
+}