Add support for json output format

README.md

@@ -48,7 +48,7 @@ type Config struct {
  * `-files` (glob string, *optional*) - File glob pattern to specify file names to process. Default is the single file with `go:generate`.
  * `-types` (glob string, *optional*) - Type glob pattern for type names to process. If not specified, the next type after `go:generate` is used.
  * `-output` (path string, **required**) - Output file name for generated documentation.
- * `-format` (`enum(markdown, plaintext, html, dotenv)` string, *optional*) - Output format for documentation.  Default is `markdown`.
+ * `-format` (`enum(markdown, plaintext, html, dotenv, json)` string, *optional*) - Output format for documentation.  Default is `markdown`.
  * `-no-styles` (`bool`, *optional*) - If true, CSS styles will not be included for `html` format.
  * `-env-prefix` (`string`, *optional*) - Sets additional global prefix for all environment variables.
  * `-tag-name` (string, *optional*, default: `env`) - Use custom tag name instead of `env`.

_examples/simple/config.go

@@ -8,6 +8,7 @@ package main
 //go:generate go run ../../ -output doc.md -format markdown
 //go:generate go run ../../ -output doc.html -format html
 //go:generate go run ../../ -output doc.env -format dotenv
+//go:generate go run ../../ -output doc.json -format json
 type Config struct {
 	// Hosts name of hosts to listen on.
 	Hosts []string `env:"HOST,required", envSeparator:";"`

_examples/simple/doc.json

@@ -0,0 +1,23 @@
+[
+  {
+    "env_name": "HOST",
+    "doc": "Hosts name of hosts to listen on.",
+    "env_separator": ";",
+    "required": true
+  },
+  {
+    "env_name": "PORT",
+    "doc": "Port to listen on.",
+    "required": true,
+    "non_empty": true
+  },
+  {
+    "env_name": "DEBUG",
+    "doc": "Debug mode enabled.",
+    "env_default": "false"
+  },
+  {
+    "env_name": "PREFIX",
+    "doc": "Prefix for something."
+  }
+]

render/config.go

@@ -65,4 +65,8 @@ var configs = map[types.OutFormat]renderConfig{
 		},
 		tmpl: newTmplText("dotenv.tmpl"),
 	},
+	types.OutFormatJSON: {
+		Item: renderItemConfig{},
+		tmpl: newTmplText("json.tmpl"),
+	},
 }

render/renderer.go

@@ -41,18 +41,18 @@ type renderSection struct {
 }
 
 type renderItem struct {
-	EnvName      string
-	Doc          string
-	EnvDefault   string
-	EnvSeparator string
+	EnvName      string `json:"env_name"`
+	Doc          string `json:"doc"`
+	EnvDefault   string `json:"env_default,omitempty"`
+	EnvSeparator string `json:"env_separator,omitempty"`
 
-	Required bool
-	Expand   bool
-	NonEmpty bool
-	FromFile bool
+	Required bool `json:"required,omitempty"`
+	Expand   bool `json:"expand,omitempty"`
+	NonEmpty bool `json:"non_empty,omitempty"`
+	FromFile bool `json:"from_file,omitempty"`
 
 	children []renderItem
-	Indent   int
+	Indent   int `json:"-"`
 }
 
 func (i renderItem) Children(indentInc int) []renderItem {

render/templ/json.tmpl

@@ -0,0 +1,3 @@
+{{- range .Sections }}
+{{- marshalIndent .Items }}
+{{- end }}

render/templates.go

@@ -2,6 +2,7 @@ package render
 
 import (
 	"embed"
+	"encoding/json"
 	"path"
 	"strings"
 
@@ -31,6 +32,10 @@ var tplFuncs = map[string]any{
 		}
 		return sum
 	},
+	"marshalIndent": func(v any) (string, error) {
+		a, err := json.MarshalIndent(v, "", "  ")
+		return string(a), err
+	},
 }
 
 const (

types/model.go

@@ -8,6 +8,7 @@ const (
 	OutFormatHTML     OutFormat = "html"
 	OutFormatTxt      OutFormat = "plaintext"
 	OutFormatEnv      OutFormat = "dotenv"
+	OutFormatJSON     OutFormat = "json"
 )
 
 // EnvDocItem is a documentation item for one environment variable.