Add diffity.com feature

README.md

@@ -27,6 +27,7 @@
 | [delta](https://github.com/devcontainer-community/devcontainer-features/tree/main/src/delta) | `delta` — syntax-highlighting pager for git diffs | gh release | 1.0.0 |
 | [deno.com](https://github.com/devcontainer-community/devcontainer-features/tree/main/src/deno.com) | `deno` — secure TypeScript/JavaScript runtime | curl | 1.0.0 |
 | [devenv.sh](https://github.com/devcontainer-community/devcontainer-features/tree/main/src/devenv.sh) | `devenv` — reproducible developer environments via Nix | nix | 1.0.0 |
+| [diffity.com](https://github.com/devcontainer-community/devcontainer-features/tree/main/src/diffity.com) | `diffity` — agent-agnostic GitHub-style diff viewer and code review tool | npm | 1.0.0 |
 | [dozzle.dev](https://github.com/devcontainer-community/devcontainer-features/tree/main/src/dozzle.dev) | `dozzle` — real-time Docker container log viewer | curl | 1.0.0 |
 | [fd](https://github.com/devcontainer-community/devcontainer-features/tree/main/src/fd) | `fd` — fast and user-friendly file finder | gh release | 1.0.0 |
 | [feature-installer](https://github.com/devcontainer-community/devcontainer-features/tree/main/src/feature-installer) | `feature-installer` — install devcontainer features at runtime | curl | 0.0.4 |

src/diffity.com/NOTES.md

@@ -0,0 +1,17 @@
+# diffity.com
+
+## Project
+
+- [diffity](https://diffity.com)
+
+## Description
+
+An agent-agnostic, GitHub-style diff viewer and code review tool. `diffity` works with Claude Code, Cursor, Codex, and any AI coding agent — run it inside any git repo to open a syntax-highlighted diff in the browser.
+
+## Installation Method
+
+Installed as a global npm package via `npm install -g diffity`. Node.js and npm are installed as prerequisites via APT.
+
+## Other Notes
+
+_No additional notes._

src/diffity.com/devcontainer-feature.json

@@ -0,0 +1,15 @@
+{
+    "name": "diffity.com",
+    "id": "diffity.com",
+    "version": "1.0.0",
+    "description": "Install \"diffity\" CLI",
+    "documentationURL": "https://github.com/devcontainer-community/devcontainer-features/tree/main/src/diffity.com",
+    "options": {
+        "version": {
+            "type": "string",
+            "default": "latest",
+            "proposals": ["latest"],
+            "description": "Version of \"diffity\" to install."
+        }
+    }
+}

src/diffity.com/install.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+set -o errexit
+set -o pipefail
+set -o noclobber
+set -o nounset
+set -o allexport
+readonly name='diffity'
+apt_get_update() {
+    if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
+        echo "Running apt-get update..."
+        apt-get update -y
+    fi
+}
+apt_get_checkinstall() {
+    if ! dpkg -s "$@" >/dev/null 2>&1; then
+        apt_get_update
+        DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends --no-install-suggests --option 'Debug::pkgProblemResolver=true' --option 'Debug::pkgAcquire::Worker=1' "$@"
+    fi
+}
+apt_get_cleanup() {
+    apt-get clean
+    rm -rf /var/lib/apt/lists/*
+}
+echo_banner() {
+    local text="$1"
+    echo -e "\e[1m\e[97m\e[41m$text\e[0m"
+}
+utils_check_version() {
+    local version=$1
+    if ! [[ "${version:-}" =~ ^(latest|[0-9]+\.[0-9]+\.[0-9]+)$ ]]; then
+        printf >&2 '=== [ERROR] Option "version" (value: "%s") is not "latest" or valid semantic version format "X.Y.Z" !\n' \
+            "$version"
+        exit 1
+    fi
+}
+install() {
+    utils_check_version "$VERSION"
+    apt_get_checkinstall nodejs npm ca-certificates build-essential python3
+    if [ "$VERSION" = 'latest' ]; then
+        npm install -g diffity
+    else
+        npm install -g "diffity@${VERSION}"
+    fi
+    apt_get_cleanup
+}
+echo_banner "devcontainer.community"
+echo "Installing $name..."
+install "$@"
+echo "(*) Done!"

test/diffity.com/test.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+set -e
+
+source dev-container-features-test-lib
+
+check "execute command" bash -c "diffity --version"
+
+reportResults