search_and_replace_specific_terms.md

Search and replace specific terms

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Create a batch change that changes wording in every repository.

Introduction

This tutorial shows you how to create a batch spec that replaces the words whitelist and blacklist with allowlist and denylist in every Markdown file across your entire code base.

The batch spec can be easily changed to search and replace other terms in other file types.

Prerequisites

We recommend using the latest version of Sourcegraph when working with Batch Changes and that you have a basic understanding of how to create batch specs and run them. See the following documents for more information:

1. "Quickstart"
2. "Introduction to Batch Changes"

Create the batch spec

Save the following batch spec YAML as allowlist-denylist.batch.yaml:

name: use-allowlist-denylist-wording
description: This batch change updates our Markdown docs to use the terms "allowlist" and "denylist" instead of "whitelist" and "blacklist".

# Search for repositories in which the term "whitelist" or "blacklist" appears
# in Markdown files.
on:
  - repositoriesMatchingQuery: whitelist OR blacklist lang:markdown -file:vendor -file:node_modules

# In each repository
steps:
  # find all *.md or *.markdown files, that are not in a vendor or node_modules
  # folder, and replace the terms in them:
  - run: |
      find . -type f \( -name '*.md' -or -name '*.markdown' \) -not -path "*/vendor/*" -not -path "*/node_modules/*" |\
      xargs sed -i 's/whitelist/allowlist/g; s/blacklist/denylist/g'
    container: alpine:3

# Describe the changeset (e.g., GitHub pull request) you want for each repository.
changesetTemplate:
  title: Replace whitelist/blacklist with allowlist/denylist
  body: This replaces the terms whitelist/blacklist in Markdown files with allowlist/denylist
  branch: batch-changes/allowlist-denylist # Push the commit to this branch.
  commit:
    message: Replace whitelist/blacklist with allowlist/denylist
  published: false

Create the batch change

1. In your terminal, run this command:

   src batch preview -f use-allowlist-denylist-wording.batch.yaml

2. Wait for it to run and compute the changes for each repository.

3. Open the preview URL that the command printed out.

4. Examine the preview. Confirm that the changes are what you intended. If not, edit your batch spec and then rerun the command above.

5. Click the Apply button to create the batch change.

6. Feel free to then publish the changesets (i.e. create pull requests and merge requests) by modifying the published attribute in the batch spec and re-running the src batch preview command.

Using ruplacer to replace terms in multiple case styles

With ruplacer we can easily search and replace terms in multiple case styles: white_list, WhiteList, WHITE_LIST etc.

The easiest way to use ruplacer in our batch spec would look like this:

steps:
    # Install and use ruplacer to replace words in case-style variations
  - run: |
      cargo install ruplacer \
      && find . -type f \( -name '*.md' -or -name '*.markdown' \) -not -path "*/vendor/*" -not -path "*/node_modules/*" >> /tmp/find_result.txt \
      && cat /tmp/find_result.txt | while read file;
      do
        ruplacer --subvert whitelist allowlist --go ${file} || echo "nothing to replace";
        ruplacer --subvert blacklist denylist --go ${file} || echo "nothing to replace";
      done
    # Use the rust image in our container
    container: rust

But there's a problem with that approach: every new execution of src batch preview has to execute the cargo install ruplacer command again. And if you're tweaking which terms you're replacing, that performance cost can become too much quite fast.

A better option would be to to build a small Docker image in which ruplacer is already installed.

To do that, save the following in a Dockerfile:

FROM rust
RUN cargo install ruplacer

Then build a Docker image out of it, tagged with ruplacer, by running the following command in your terminal:

docker build . -t ruplacer

Once that is done, we can use the following steps in our batch spec:

steps:
  - run: |
      find . -type f \( -name '*.md' -or -name '*.markdown' \) -not -path "*/vendor/*" -not -path "*/node_modules/*" >> /tmp/find_result.txt \
      && cat /tmp/find_result.txt | while read file;
      do
        ruplacer --subvert whitelist allowlist --go ${file} || echo "nothing to replace";
        ruplacer --subvert blacklist denylist --go ${file} || echo "nothing to replace";
      done
    # Use the newly-built ruplacer image
    container: ruplacer

Save the file and run the src batch preview command from above again to use ruplacer to replace variations of terms.