Support printing range of last pages

nbesli · Oct 13, 2022 · 0385ec4 · 0385ec4
1 parent 581e6a6
commit 0385ec4
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Showing 3 changed files with 8 additions and 3 deletions.
diff --git a/index.js b/index.js
@@ -71,7 +71,7 @@ class PDFMerger {
     const srcDoc = await PDFDocument.load(src, this.loadOptions)
     const pageCount = srcDoc.getPageCount()
 
-    if (from >= pageCount || to >= pageCount) {
+    if (from > pageCount || to > pageCount) {
       throw new Error(`Invalid function parameter. The document has not enought pages. (from:${from}, to:${to}, pages:${pageCount})`)
     }
 

diff --git a/package-lock.json b/package-lock.json
diff --git a/test/issues.test.js b/test/issues.test.js
@@ -37,6 +37,12 @@ describe('issues', () => {
     await merger.save(path.join(TMP_DIR, 'issue-88_merged.pdf'))
   })
 
+  test('merge the last pages of a pdf (#101)', async () => {
+    const merger = new PDFMerger()
+    await merger.add(path.join(FIXTURES_DIR, 'UDHR.pdf'), '7 to 8')
+    await merger.save(path.join(TMP_DIR, 'issue-101_me.pdf'))
+  })
+
   afterAll(async () => {
     await fs.remove(TMP_DIR)
   })