Add files

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'codewars/forth' }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/setup-buildx-action@v2
+
+      - name: Build image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: false
+          # Make the image available in next step
+          load: true
+          tags: ghcr.io/codewars/forth:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Run Passing Example
+        run: bin/run passing
+
+      - name: Report Image Size
+        run: |
+          echo "## Image Size" >> $GITHUB_STEP_SUMMARY
+          docker image inspect --format '{{.Size}}' ghcr.io/codewars/forth:latest | numfmt --to=si --suffix=B >> $GITHUB_STEP_SUMMARY

.github/workflows/push-image.yml

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+# Build and push a Docker image to GitHub Container Registry when
+# a new tag is pushed.
+name: Push Image
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  build-and-push-image:
+    if: ${{ github.repository == 'codewars/forth' }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository_owner }}/forth:latest
+            ghcr.io/${{ github.repository_owner }}/forth:${{ github.ref_name }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

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+FROM ubuntu:18.04
+
+ENV LANG=C.UTF-8
+RUN set -ex; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+# Install GNU Forth Language Environment 0.7.3
+# https://packages.ubuntu.com/bionic/gforth
+        gforth \
+        wget \
+        ca-certificates \
+    ; \
+    rm -rf /var/lib/apt/lists/*;
+
+RUN set -ex; \
+    useradd --create-home codewarrior; \
+    mkdir /workspace; \
+    chown codewarrior:codewarrior /workspace;
+
+USER codewarrior
+ENV USER=codewarrior \
+    HOME=/home/codewarrior
+WORKDIR /workspace
+
+# `ttester-codewars.4th` contains words to make test output in Codewars format.
+RUN wget -q https://raw.githubusercontent.com/codewars/ttester-codewars/v0.0.4/ttester-codewars.4th

LICENSE

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+MIT License
+
+Copyright (c) 2023 Codewars
+
+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.

README.md

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+# Forth
+
+Container image for Forth used by CodeRunner.
+
+## Usage
+
+Use the `bin/run` to test examples in `examples/`.
+
+```bash
+./bin/run passing
+```
+
+## Examples
+
+- `passing`: a passing example
+
+## Building
+
+```bash
+docker build -t ghcr.io/codewars/forth:latest .
+```

bin/run

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+#!/usr/bin/env bash
+set -eu
+
+W=/workspace
+FILES="preloaded.4th solution.4th ttester-codewars.4th tests.4th"
+# Create container
+C=$(docker container create --rm -w $W ghcr.io/codewars/forth:latest sh -c "gforth $FILES -e bye")
+
+# Copy files from the current directory
+docker container cp examples/${1:-passing}/. $C:$W
+
+# Run tests
+docker container start --attach $C

examples/passing/preloaded.4th

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+\ preloaded.4th is loaded before solution.4th

examples/passing/solution.4th

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+: solution  ( u1|n1 u2|n2 -- u3|n3 )  + ; \ Addition

examples/passing/tests.4th

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+s" solution" describe#{
+  s" returns sum" it#{
+    <{ 1 1 solution -> 2 }>
+  }#
+}#