5.0.0 (#66)

internal/pkg/printer/merge.go

@@ -0,0 +1,50 @@
+package printer
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"time"
+)
+
+type merge struct {
+	ctx    context.Context
+	fpaths []string
+	opts   *MergeOptions
+}
+
+// MergeOptions helps customizing the
+// merge printer behaviour.
+type MergeOptions struct {
+	WaitTimeout float64
+}
+
+// NewMerge returns a merge printer.
+func NewMerge(fpaths []string, opts *MergeOptions) Printer {
+	return &merge{
+		fpaths: fpaths,
+		opts:   opts,
+	}
+}
+
+func (p *merge) Print(destination string) error {
+	if p.ctx == nil {
+		ctx, cancel := context.WithTimeout(context.Background(), time.Duration(p.opts.WaitTimeout)*time.Second)
+		defer cancel()
+		p.ctx = ctx
+	}
+	var cmdArgs []string
+	cmdArgs = append(cmdArgs, p.fpaths...)
+	cmdArgs = append(cmdArgs, "cat", "output", destination)
+	cmd := exec.CommandContext(p.ctx, "pdftk", cmdArgs...)
+	_, err := cmd.Output()
+	if err != nil {
+		return fmt.Errorf("pdtk: %v", err)
+	}
+	return nil
+}
+
+// Compile-time checks to ensure type implements desired interfaces.
+var (
+	_ = Printer(new(merge))
+)