initial

.gitignore

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+uhandles
+test/

Dockerfile

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+#
+# tiny go builder
+#
+
+FROM ubuntu:20.04
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+	golang-go build-essential ca-certificates
+
+WORKDIR /host
+
+CMD go get && make build

Makefile

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+all:
+	docker build -t uhandles .
+	docker run --rm -v "${PWD}":/host uhandles
+	docker rmi uhandles
+
+build:
+	go build -o uhandles -tags netgo -installsuffix netgo --ldflags '-w -extldflags "-static"' uhandles.go	
+
+clean:
+	rm uhandles

README.md

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+# uhandles
+
+An escalation of [jsonsubst](https://github.com/arbitar/jsonsubst).  
+Small static Go program with no external runtime dependencies that takes a [handlebars](https://handlebarsjs.com) template in from stdin, renders it with data from a JSON file (passed by argument), and outputs the result to stdout.  
+This is basically just a simple wrapper around [aymerick/raymond](https://github.com/aymerick/raymond).
+
+## Usage
+Very simple. One argument: JSON file.
+
+`./uhandles data.json <input.txt >output.txt`
+
+Or, in a pipeline of some kind...
+
+`cat input.txt | ./uhandles data.json | tee output.txt`
+
+## Build
+If you're cool and already have a good working Go build environment on your system, just run `make build`.
+
+I'm not cool though, so I use Docker for this kind of thing, which is why it's the default make target. Just run `make` on a system with Docker running on it, and a build image will be created, `make build` executed within the container where all the prerequisites exist, and the build image will be removed after it's done.
+
+## Notes
+No external runtime dependencies, so it should run anywhere. Which means it'll run inside your quick-and-dirty Docker stuff without complaint.

go.mod

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+module github.com/arbitar/uhandles
+
+go 1.19
+
+require github.com/aymerick/raymond v2.0.2+incompatible
+
+require gopkg.in/yaml.v2 v2.4.0 // indirect

go.sum

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+github.com/aymerick/raymond v2.0.2+incompatible h1:VEp3GpgdAnv9B2GFyTvqgcKvY+mfKMjPOA3SbKLtnU0=
+github.com/aymerick/raymond v2.0.2+incompatible/go.mod h1:osfaiScAUVup+UC9Nfq76eWqDhXlp+4UYaA8uhTBO6g=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=

uhandles.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+
+	"github.com/aymerick/raymond"
+)
+
+func main() {
+	if len(os.Args) != 2 {
+		fmt.Println("Usage: uhandlebars <json file>")
+		os.Exit(1)
+	}
+
+	jsonFile := os.Args[1]
+
+	jsonData, err := ioutil.ReadFile(jsonFile)
+	if err != nil {
+		fmt.Println("Error reading JSON file:", err)
+		os.Exit(1)
+	}
+
+	var data interface{}
+	err = json.Unmarshal(jsonData, &data)
+	if err != nil {
+		fmt.Println("Error parsing JSON file:", err)
+		os.Exit(1)
+	}
+
+	template, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		fmt.Println("Error reading template from stdin:", err)
+		os.Exit(1)
+	}
+
+	result, err := raymond.Render(string(template), data)
+	if err != nil {
+		fmt.Println("Error rendering template:", err)
+		os.Exit(1)
+	}
+
+	fmt.Println(strings.TrimSpace(result))
+}