feat: add split methods for chromium and libreoffice requests (#32)

* feat: add split methods for chromium and libreoffice requests

* chore: move split mode values to constants

---------

Co-authored-by: Alexander Pikeev <alexanderpikeev@xmail.ru>

chromium.go

@@ -209,6 +209,19 @@ func (req *chromiumRequest) Metadata(jsonData []byte) {
 	req.fields[fieldMetadata] = string(jsonData)
 }
 
+// SplitIntervals splits the resulting PDF by interval.
+func (req *chromiumRequest) SplitIntervals(span int) {
+	req.fields[fieldSplitMode] = splitModeIntervals
+	req.fields[fieldSplitSpan] = strconv.Itoa(span)
+}
+
+// SplitPages splits the resulting PDF by pages. Span should have the format “1-5”.
+func (req *chromiumRequest) SplitPages(span string, unify bool) {
+	req.fields[fieldSplitMode] = splitModePages
+	req.fields[fieldSplitSpan] = span
+	req.fields[fieldSplitUnify] = strconv.FormatBool(unify)
+}
+
 // ScreenshotWidth Width sets the device screen width in pixels.
 func (req *chromiumRequest) ScreenshotWidth(width float64) {
 	req.fields[fieldScreenshotWidth] = fmt.Sprintf("%f", width)

fields.go

@@ -96,3 +96,9 @@ const (
 	fieldSplitSpan  = "splitSpan"
 	fieldSplitUnify = "splitUnify"
 )
+
+// Split mode.
+const (
+	splitModePages     = "pages"
+	splitModeIntervals = "intervals"
+)

libreoffice.go

@@ -172,6 +172,19 @@ func (req *LibreOfficeRequest) Metadata(md []byte) {
 	req.fields[fieldMetadata] = string(md)
 }
 
+// SplitIntervals splits the resulting PDF by interval.
+func (req *LibreOfficeRequest) SplitIntervals(span int) {
+	req.fields[fieldSplitMode] = splitModeIntervals
+	req.fields[fieldSplitSpan] = strconv.Itoa(span)
+}
+
+// SplitPages splits the resulting PDF by pages. Span should have the format “1-5”.
+func (req *LibreOfficeRequest) SplitPages(span string, unify bool) {
+	req.fields[fieldSplitMode] = splitModePages
+	req.fields[fieldSplitSpan] = span
+	req.fields[fieldSplitUnify] = strconv.FormatBool(unify)
+}
+
 // Merge merges the resulting PDFs.
 func (req *LibreOfficeRequest) Merge() {
 	req.fields[fieldOfficeMerge] = strconv.FormatBool(true)

split_intervals.go

@@ -14,7 +14,7 @@ type SplitIntervalsRequest struct {
 
 func NewSplitIntervalsRequest(pdfs ...document.Document) *SplitIntervalsRequest {
 	br := newBaseRequest()
-	br.fields[fieldSplitMode] = "intervals"
+	br.fields[fieldSplitMode] = splitModeIntervals
 
 	return &SplitIntervalsRequest{
 		pdfs:        pdfs,

split_pages.go

@@ -14,7 +14,7 @@ type SplitPagesRequest struct {
 
 func NewSplitPagesRequest(pdfs ...document.Document) *SplitPagesRequest {
 	br := newBaseRequest()
-	br.fields[fieldSplitMode] = "pages"
+	br.fields[fieldSplitMode] = splitModePages
 
 	return &SplitPagesRequest{
 		pdfs:        pdfs,