Creating Tree Structure from Headings in Google Documents using Google Apps Script

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Description

This is a Google Apps Script for creating the tree structure from headings in Google Documents.

Usage

In order to test this script, please do the following steps.

1. Sample Document

Create a sample Document as follows.

2. Sample script

Open the script editor and copy and paste the following script.

In this script, Document service (DocumentApp) is used.

function sample1() {
  const headTypes = [
    "TITLE",
    "HEADING1",
    "HEADING2",
    "HEADING3",
    "HEADING4",
    "HEADING5",
    "HEADING6",
  ];
  const body = DocumentApp.getActiveDocument().getBody();
  const res = body
    .getParagraphs()
    .reduce((ar, p) => {
      const idx = headTypes.indexOf(p.getHeading().toString());
      if (idx > -1) {
        ar.push(Array(idx).fill(" ").join("") + p.getText());
      }
      return ar;
    }, [])
    .join("\n");
  console.log(res);
}

As another approach, the following script uses Docs API. Please enable Docs API at Advanced Google services. Ref

function sample2() {
  const headTypes = [
    "TITLE",
    "HEADING_1",
    "HEADING_2",
    "HEADING_3",
    "HEADING_4",
    "HEADING_5",
    "HEADING_6",
  ];
  const documentId = DocumentApp.getActiveDocument().getId();
  const obj = Docs.Documents.get(documentId).body.content;
  const res = obj
    .reduce((ar, e) => {
      if (
        e.paragraph &&
        e.paragraph.paragraphStyle &&
        e.paragraph.paragraphStyle.namedStyleType
      ) {
        const idx = headTypes.indexOf(
          e.paragraph.paragraphStyle.namedStyleType
        );
        if (idx > -1) {
          ar.push(
            Array(idx).fill(" ").join("") +
              e.paragraph.elements[0].textRun.content.trim()
          );
        }
      }
      return ar;
    }, [])
    .join("\n");
  console.log(res);
}

When you run the functions sample1 and sample2, the following result is obtained in the console.

Title1A
 Heading1A
  Heading2A
   Heading3A
    Heading4A
     Heading5A
      Heading6A
Title1B
 Heading1B
  Heading2B
   Heading3B
    Heading4B
     Heading5B
      Heading6B

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