Write MVP version

.github/workflows/gha-summarizer.yaml

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+name: GHA Summarizer
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - "README.md"
+      - "LICENSE"
+env:
+  image: ghcr.io/${{ github.repository }}/gha-summarizer
+
+jobs:
+  test:
+    permissions:
+      contents: read
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+
+      - name: Render template
+        uses: ./
+        with:
+          template: example/template.md
+          out-file: out.md
+
+      - name: Check if the rendered file is different
+        run: |
+          diff --unified ./example/result.md ./out.md | tee diff.txt
+          if [ -s diff.txt ]; then
+            echo "The rendered file is different from the template"
+            exit 1
+          fi
+      - name: Upload diff
+        if: success() || failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: diff.txt
+          path: diff.txt

Dockerfile

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+FROM golang:1.23 AS builder
+
+WORKDIR /workdir
+
+COPY go.mod ./
+COPY ./main.go ./
+
+RUN go build -o gha-summarizer github.com/VOID404/gha-summarizer
+
+FROM scratch
+
+WORKDIR /github/workspace
+
+COPY --from=builder /workdir/gha-summarizer /gha-summarizer
+ENTRYPOINT [ "/gha-summarizer" ]

LICENSE

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+MIT License
+
+Copyright (c) 2024 Wojciech Nawa
+
+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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+# GHA Summarizer

action.yaml

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+name: "GHA Summarizer"
+description: "Simple templating for Github Actions"
+inputs:
+  template:
+    description: "Template to render"
+    required: true
+  out-file:
+    description: "File to write output to"
+    required: true
+runs:
+  using: docker
+  image: Dockerfile
+  args:
+    - ${{ inputs.template }}
+    - ${{ inputs.out-file }}

example/code.go

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+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello, World!")
+}

example/result.md

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+# Sample template
+
+Generated from `VOID404/gha-summarizer`
+
+```go
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello, World!")
+}
+
+```

example/template.md

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+# Sample template
+
+Generated from `{{ env "$GITHUB_REPOSITORY" }}`
+
+```go
+{{ file "./example/code.go"}}
+```

go.mod

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+module github.com/VOID404/gha-summarizer
+
+go 1.23.0

main.go

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+package main
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"text/template"
+)
+
+func main() {
+	if len(os.Args) < 3 {
+		fmt.Printf("Usage: %s <template file> <output file>\n", os.Args[0])
+		os.Exit(1)
+	}
+
+	tplFile := os.Args[1]
+	outFile, err := os.OpenFile(os.Args[2], os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		panic(err)
+	}
+
+	funcMap := make(map[string]any)
+	funcMap["file"] = func(name string) string {
+		data, err := os.ReadFile(name)
+		if err != nil {
+			panic(err)
+		}
+		return string(data)
+	}
+
+	funcMap["env"] = func(text string) string {
+		return os.ExpandEnv(text)
+	}
+
+	tpl := template.Must(
+		template.New(path.Base(tplFile)). //
+							Funcs(funcMap).
+							ParseFiles(tplFile),
+	)
+
+	err = tpl.Execute(outFile, nil)
+	if err != nil {
+		panic(err)
+	}
+}