diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..8394c08
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 sideshowbarker
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c4c2ff0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,145 @@
+## git-gloss ✨ make git logs show PR/issue/reviewer links
+
+### How to use git-gloss
+
+You can download and run `git-gloss` within a directory having a GitHub repo clone by doing this:
+
+```
+curl -fsSLO https://sideshowbarker.github.io/git-gloss/git-gloss && bash ./git-gloss
+```
+
+That will add [git notes](https://web.archive.org/web/20180121193320/http://git-scm.com/blog/2010/08/25/notes.html) locally for all commits in the local commit history with an associated GitHub pull request.
+
+#### How long does it take?
+
+`git-gloss` can process at most about 22 commits per minute — or about 1300 commits per hour.
+
+So, the first time you run it in a repo with many commits, it’ll take a long time — hours, or even a day or more.
+
+For example, if your repo has somewhere around 1000 commits, it’ll take about 45 minutes to finish. If your repo has somewhere around 10,000 commits, it’ll take more than 7 hours. And so on.
+
+You can stop `git-gloss` at any time with <kbd>Ctrl</kbd>-<kbd>C</kbd>. After stopping it, when you run it again, it will start off wherever it left off. So for example, if you have a repo with somewhere around 10,000 commits, and you stopped `git-gloss` after it was running for about an hour, then it will run for about another hour before it finishes.
+
+#### How to fix errors
+
+`git-gloss` doesn’t yet have error handling for the case where a call to the GitHub API fails. So you can keep a log of its output, and review it after `git-gloss` finishes. You can create a log by invoking `git-gloss` like this:
+
+```
+git-gloss 2>&1 | tee $(mktemp -p .)
+```
+
+That creates a log file in the current directory with a name such as `tmp.gndYHHPKgA` — using the `mktemp` and `tee` utilities, which are standard in any Linux/Unix environment (including the macOS Terminal/shell environment).
+
+After `git-log` finishes (or even as it’s running), you can review the log for error output that looks like this:
+
+```
+1320/56162 https://github.com/LadybirdBrowser/ladybird/commit/67c727177e
+jq: parse error: Invalid numeric literal at line 1, column 314
+jq: parse error: Invalid numeric literal at line 1, column 314
+jq: error (at <stdin>:1): Cannot index object with number
+jq: parse error: Invalid numeric literal at line 1, column 315
+```
+
+For each case like that which you see in the log output, you’ll need to complete the following steps:
+
+1. Remove any note which `git-gloss` may have added for the given commit:
+
+   ```
+   git notes remove 67c727177e
+   ```
+
+2. (Re)add a note for the given commit, by running `git-gloss` with the commit hash specified:
+
+   ```
+   git-gloss 67c727177e
+   ```
+
+#### How to share the notes
+
+Once `git-gloss` finishes running, here’s how you can share the notes with everyone in your GitHub project:
+
+1. Push the notes back to your project remote at GitHub by running this command:
+
+   ```
+   git push origin 'refs/notes/*'
+   ```
+
+2. Others in your project can then fetch the notes from GitHub by running this command:
+
+   ```
+   git fetch origin 'refs/notes/*:refs/notes/*'
+   ```
+
+   Alternatively, rather than running the above command manually, others in the project can update their git configuration by runing the following command;
+
+   ```
+   git config --add remote.origin.fetch 'refs/notes/*:refs/notes/*'
+   ```
+
+   That will cause all notes to be fetched from the remote every time they use `git fetch` or `git pull`.
+
+3. Run `git-gloss` again to add notes for any new commits made after the last time you ran `git-gloss`.
+
+4. Keep your project’s notes up to date by repeating steps 1 to 3 at a regular cadence (e.g., once day or so).
+
+### Dependencies
+
+* `git` – any version with support for the `--no-separator` option for the `git notes` command
+
+* `jq` – https://jqlang.github.io/jq/ (JSON processor)
+
+* `gh` – https://cli.github.com/ (GitHub CLI)
+
+* `grep` – on macOS in particular, a grep program other than the Apple-provided one is recommended (for instance, GNU grep or [ripgrep](https://github.com/BurntSushi/ripgrep#installation)); example:
+
+  ```
+  brew install ripgrep
+  brew install grep
+  ```
+
+### Environment variables
+
+You can affect the `git-gloss` behavior using the following environment variables:
+
+* `GIT`
+
+  You can use this to specify a path to a different `git` binary — for instance, in the case where you have multiple different `git` versions on your system; example:
+
+  ```
+  export GIT=/opt/homebrew/bin/git
+  ```
+
+* `GREP`
+
+  You can use this to specify a path to any grep-compatible binary on your system; for instance, to avoid using the Apple-provided `grep` on macOS; example:
+
+  ```
+  export GREP=/opt/homebrew/bin/rg
+  ```
+
+* `OTHER_REPO`
+
+  You can use this to specify an `[owner]/[repo]` repo other than the current repo; e.g., a repo the current repo shares part of its commit history with (because the current repo was created from an older repo); example:
+
+  ```
+  export OTHER_REPO=SerenityOS/serenity
+  ```
+
+  If you specify an `OTHER_REPO` value, then if `git-gloss` can’t find any pull request for a particular commit in the current repo, it will then look for a pull request in the repo you specified in the `OTHER_REPO` value.
+
+* `OTHER_OTHER_REPO`
+
+  You can use this in addition to `OTHER_REPO` — if you have a third repo with a shared history; example:
+
+  ```
+  export OTHER_OTHER_REPO=LadybirdBrowser/ancient-history
+  ```
+
+Rather than exporting each of those environment variables to your shell, you can instead specify them all at the same time in the invocation you use for running `git-gloss` — like this:
+
+```
+OTHER_OTHER_REPO=LadybirdBrowser/ancient-history OTHER_REPO=SerenityOS/serenity \
+    GREP=rg GIT=/opt/homebrew/bin/git ./git-gloss
+```
+
+## Make a “git gloss” command
diff --git a/git-gloss b/git-gloss
new file mode 100755
index 0000000..cd3b8c9
--- /dev/null
+++ b/git-gloss
@@ -0,0 +1,157 @@
+#!/bin/bash
+
+GIT=${GIT:-git}
+GREP=${GREP:-grep}
+
+remoteURLproperty=remote.origin.url
+if [ -n "$(GIT config --get remote.upstream.url)" ]; then
+  remoteURLproperty=remote.upstream.url
+fi
+
+repoURL=$(GIT config --get $remoteURLproperty | sed -r \
+  's/.*(\@|\/\/)(.*)(\:|\/)([^:\/]*)\/([^\/]*)\.git/https:\/\/\2\/\4\/\5/')
+
+startRepo=$(echo "$repoURL" | rev | cut -d '/' -f-1 | rev)
+startOwner=$(echo "$repoURL" | rev | cut -d '/' -f2 | rev)
+if [[ $repoURL == *"github"* && -z "$startRepo" ]]; then
+  echo
+  echo -n -e \
+    "Error: This tool must be run from within a clone " >&2
+  echo -e "of a GitHub repo. Stopping." >&2
+  exit 1;
+fi
+
+otherRepo=$(echo "$OTHER_REPO" | rev | cut -d '/' -f-1 | rev)
+otherOwner=$(echo "$OTHER_REPO" | rev | cut -d '/' -f2 | rev)
+otherOtherRepo=$(echo "$OTHER_OTHER_REPO" | rev | cut -d '/' -f-1 | rev)
+otherOtherOwner=$(echo "$OTHER_OTHER_REPO" | rev | cut -d '/' -f2 | rev)
+
+if ! [[ -x "$(command -v jq)" ]]; then
+  echo
+  echo -e \
+    "Error: You must have jq installed in order to use this tool." >&2
+  exit 1;
+fi
+allCommits=$(mktemp)
+commitsWithNotes=$(mktemp)
+commitsWithoutNotes=$(mktemp)
+$GIT log --pretty=format:"%H" > "$allCommits"
+$GIT notes list | xargs | tr " " "\n" > "$commitsWithNotes"
+if [[ -s "$commitsWithNotes" ]]; then
+  $GREP -Fxv -f "$commitsWithNotes" "$allCommits" > "$commitsWithoutNotes"
+else
+  commitsWithoutNotes=$allCommits
+fi
+totalCommitsCount=$(wc -l < "$commitsWithoutNotes" | xargs)
+if [ "$totalCommitsCount" -eq "0" ]; then 
+  commitsWithoutNotes=$allCommits
+fi
+echo "Found $totalCommitsCount commits to process."
+echo
+currentCommitNumber=0
+
+addNote () {
+  sleep .1
+  ((currentCommitNumber++))
+  printf "%${#totalCommitsCount}d" "$currentCommitNumber"
+  echo -n "/$totalCommitsCount "
+  shortCommitHash=$(git rev-parse --short "$1")
+  echo "https://github.com/$owner/$repo/commit/$shortCommitHash"
+  commit=$(gh api "/repos/$owner/$repo/commits/$1" 2>&1)
+  pullRequest=$(gh api "/repos/$owner/$repo/commits/$1/pulls" 2>&1)
+  if [[ "$pullRequest" == "[]"
+      || $(echo "$pullRequest" | jq ".status" 2>/dev/null) == '"422"' ]]; then
+    if [[ -n "$otherRepo" ]]; then
+      otherCommit=$(gh api "/repos/$otherOwner/$otherRepo/commits/$1" 2>&1)
+      if [[ $(echo "$otherCommit" | jq ".status" 2>/dev/null) != '"422"' ]]; then
+        pullRequest=$(gh api "/repos/$otherOwner/$otherRepo/commits/$1/pulls" 2>&1)
+        owner="$otherOwner"; repo="$otherRepo"
+      elif [[ -n "$otherOtherRepo" ]]; then
+        otherOtherCommit=$(gh api "/repos/$otherOtherOwner/$otherOtherRepo/commits/$1" 2>&1)
+        if [[ $(echo "$otherOtherCommit" | jq ".status" 2>/dev/null) != '"422"' ]]; then
+          pullRequest=$(gh api "/repos/$otherOtherOwner/$otherOtherRepo/commits/$1/pulls" 2>&1)
+          owner="$otherOtherOwner"; repo="$otherOtherRepo"
+        fi
+      fi
+    fi
+  fi
+  author=$(echo "$commit" | jq ".author.login" | tr -d '"')
+  authorEmail=$(echo "$commit" | jq ".commit.author.email" | tr -d '"')
+  authorFirstCommit=$(git log --format="%H" --no-use-mailmap --author="$authorEmail" | tail -1)
+  if [[ "$authorFirstCommit" == "$1" ]]; then
+    $GIT notes append --no-separator -m "Author: https://github.com/$author 🔰" "$1"
+  else
+    $GIT notes append --no-separator -m "Author: https://github.com/$author" "$1"
+  fi
+  $GIT notes append --no-separator -m "Commit: https://github.com/$owner/$repo/commit/$shortCommitHash" "$1"
+  if [[ "$pullRequest" == "[]"
+    || $(echo "$pullRequest" | jq ".status" 2>/dev/null) == '"422"' ]]; then
+    return 0
+  fi
+  prNumber=$(echo "$pullRequest" | jq '.[0].number')
+  if [[ -n "$prNumber" && "$prNumber" != "null" ]]; then
+    $GIT notes append --no-separator -m "Pull-request: https://github.com/$owner/$repo/pull/$prNumber" "$1"
+    # shellcheck disable=SC2016
+    issues=$(gh api graphql \
+      -F owner="$owner" -F repo="$repo" -F pr="$prNumber" -f query='
+    query ($owner: String!, $repo: String!, $pr: Int!) {
+            repository(owner: $owner, name: $repo) {
+                    pullRequest(number: $pr) {
+                            closingIssuesReferences(first: 100) {
+                                    nodes {
+                                            number
+                                    }
+                            }
+                    }
+            }
+    }'  --jq '.data.repository.pullRequest.closingIssuesReferences.nodes[].number')
+    if [[ -n "$issues" ]]; then
+      for issue in $issues; do
+        $GIT notes append --no-separator -m "Issue: https://github.com/$owner/$repo/issues/$issue" "$1"
+      done;
+    fi
+    reviewerDataFile=$(mktemp)
+    reviews=$(gh api "/repos/$owner/$repo/pulls/$prNumber/reviews" 2>/dev/null | jq  "sort_by(.state)")
+    if [[ -n "$reviews" && $(echo "$reviews" | jq ".status" 2>/dev/null) != '"404"' ]]; then
+      echo "$reviews" | jq -c -r '.[]' | while read -r review; do
+        reviewer=$(echo "$review" | jq -r ".user.login")
+        state=$(echo "$review" | jq -r ".state")
+        association=$(echo "$review" | jq -r ".author_association")
+        case "$association" in
+          OWNER | MEMBER | CONTRIBUTOR | COLLABORATOR | OUTSIDE_COLLABORATOR)
+            if [[ -z $($GREP "$reviewer" "$reviewerDataFile") \
+                && "$reviewer" != "$author"
+                && "github-actions[bot]" != "$reviewer" ]]; then
+              if [[ "$state" == "APPROVED" ]]; then
+                echo "Reviewed-by: https://github.com/$reviewer ✅" >> "$reviewerDataFile";
+              else
+                echo "Reviewed-by: https://github.com/$reviewer" >> "$reviewerDataFile";
+              fi
+            fi
+        esac
+      done
+      reviewerData=$(sort "$reviewerDataFile" | uniq)
+      echo "$reviewerData" > "$reviewerDataFile"
+      [[ -s "$reviewerDataFile" ]] && while read -r line; do
+        [[ -n "$line" ]] && $GIT notes append --no-separator -m "$line" "$1"
+      done < "$reviewerDataFile"
+    fi
+  fi
+}
+if [[ -z "$*" ]]; then
+  while read -r line; do
+    owner=$startOwner
+    repo=$startRepo
+    if [[ -z $($GIT notes show "$line" 2>/dev/null) ]]; then
+      addNote "$line"
+    fi
+  done < "$commitsWithoutNotes"
+else
+  for sha in "$@"; do
+    owner=$startOwner
+    repo=$startRepo
+    if [[ -z $($GIT notes show "$sha" 2>/dev/null) ]]; then
+      addNote "$sha"
+    fi
+  done
+fi