Add CLI tool to infer JTD

Author: bombsimon

.golangci.yaml

@@ -40,7 +40,6 @@ linters:
     - errname
     - errorlint
     - exhaustive
-    - forbidigo
     - forcetypeassert
     - gochecknoglobals
     - gochecknoinits

README.md

@@ -76,5 +76,83 @@ schema := InferStrings(rows, WithoutHints()).IntoSchema()
 // }
 ```
 
+## CLI tool
+
+There's not really a need for yet another CLI tool since the original
+[jtd-infer] project contains one, but since it was just a couple of lines to
+achieve this there's a CLI tool bundled here as well.
+
+### Installation
+
+```sh
+go install github.com/bombsimon/jtd-infer-go/cmd/jtd-infer-go
+```
+
+### CLI usage
+
+The CLI tool reads from STDIN so something like this is the intended usage.
+
+```sh
+› echo '{"foo": "bar", "biz": 1}' | jtd-infer-go
+{
+  "properties": {
+    "biz": {
+      "type": "uint8"
+    },
+    "foo": {
+      "type": "string"
+    }
+  }
+}
+```
+
+```sh
+› cat example.json
+{"name":"Joe", "age": 52, "something_optional": true, "something_nullable": 1.1}
+{"name":"Jane", "age": 48, "something_nullable": null}
+
+› cat example.json | jtd-infer-go
+{
+  "properties": {
+    "age": {
+      "type": "uint8"
+    },
+    "name": {
+      "type": "string"
+    },
+    "something_nullable": {
+      "nullable": true,
+      "type": "float64"
+    }
+  },
+  "optionalProperties": {
+    "something_optional": {
+      "type": "boolean"
+    }
+  }
+}
+
+› jtd-infer-go < cmd/jtd-infer-go/example.json
+{
+  "properties": {
+    "age": {
+      "type": "uint8"
+    },
+    "name": {
+      "type": "string"
+    },
+    "something_nullable": {
+      "nullable": true,
+      "type": "float64"
+    }
+  },
+  "optionalProperties": {
+    "something_optional": {
+      "type": "boolean"
+    }
+  }
+}
+```
+
 [jtd-infer]: https://github.com/jsontypedef/json-typedef-infer/
 [examples]: examples

cmd/jtd-infer-go/example.json

@@ -0,0 +1,2 @@
+{"name":"Joe", "age": 52, "something_optional": true, "something_nullable": 1.1}
+{"name":"Jane", "age": 48, "something_nullable": null}

cmd/jtd-infer-go/main.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"fmt"
+	"os"
+
+	jtdinfer "github.com/bombsimon/jtd-infer-go"
+)
+
+func main() {
+	inferrer := jtdinfer.NewInferrer(jtdinfer.WithoutHints())
+	scanner := bufio.NewScanner(os.Stdin)
+
+	for scanner.Scan() && scanner.Text() != "" {
+		var toInfer any
+		if err := json.Unmarshal(scanner.Bytes(), &toInfer); err != nil {
+			fmt.Printf("failed to infer string: %s\n", err)
+			os.Exit(1)
+		}
+
+		inferrer = inferrer.Infer(toInfer)
+	}
+
+	schema := inferrer.IntoSchema()
+	j, _ := json.MarshalIndent(schema, "", "  ") //nolint:errchkjson
+	fmt.Println(string(j))
+}