chore: go mod vendor / tidy

vendor/github.com/mmcloughlin/avo/printer/printer.go

@@ -0,0 +1,98 @@
+// Package printer implements printing of avo files in various formats.
+package printer
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/mmcloughlin/avo/internal/stack"
+	"github.com/mmcloughlin/avo/ir"
+)
+
+// Printer can produce output for an avo File.
+type Printer interface {
+	Print(*ir.File) ([]byte, error)
+}
+
+// Builder can construct a printer.
+type Builder func(Config) Printer
+
+// Config represents general printing configuration.
+type Config struct {
+	// Command-line arguments passed to the generator. If provided, this will be
+	// included in a code generation warning.
+	Argv []string
+
+	// Name of the code generator.
+	Name string
+
+	// Name of Go package the generated code will belong to.
+	Pkg string
+}
+
+// NewDefaultConfig produces a config with Name "avo".
+// The package name is guessed from the current directory.
+func NewDefaultConfig() Config {
+	return Config{
+		Name: "avo",
+		Pkg:  pkg(),
+	}
+}
+
+// NewArgvConfig constructs a Config from os.Args.
+// The package name is guessed from the current directory.
+func NewArgvConfig() Config {
+	return Config{
+		Argv: os.Args,
+		Pkg:  pkg(),
+	}
+}
+
+// NewGoRunConfig produces a Config for a generator that's expected to be
+// executed via "go run ...".
+func NewGoRunConfig() Config {
+	path := mainfile()
+	if path == "" {
+		return NewDefaultConfig()
+	}
+	argv := []string{"go", "run", filepath.Base(path)}
+	if len(os.Args) > 1 {
+		argv = append(argv, os.Args[1:]...)
+	}
+	return Config{
+		Argv: argv,
+		Pkg:  pkg(),
+	}
+}
+
+// GeneratedBy returns a description of the code generator.
+func (c Config) GeneratedBy() string {
+	if c.Argv == nil {
+		return c.Name
+	}
+	return fmt.Sprintf("command: %s", strings.Join(c.Argv, " "))
+}
+
+// GeneratedWarning returns text for a code generation warning. Conforms to https://golang.org/s/generatedcode.
+func (c Config) GeneratedWarning() string {
+	return fmt.Sprintf("Code generated by %s. DO NOT EDIT.", c.GeneratedBy())
+}
+
+// mainfile attempts to determine the file path of the main function by
+// inspecting the stack. Returns empty string on failure.
+func mainfile() string {
+	if m := stack.Main(); m != nil {
+		return m.File
+	}
+	return ""
+}
+
+// pkg guesses the name of the package from the working directory.
+func pkg() string {
+	if cwd, err := os.Getwd(); err == nil {
+		return filepath.Base(cwd)
+	}
+	return ""
+}