83 lines
1.5 KiB
Go
83 lines
1.5 KiB
Go
package printer
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/mmcloughlin/avo"
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"github.com/mmcloughlin/avo/internal/stack"
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)
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type Printer interface {
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Print(*avo.File) ([]byte, error)
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}
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type Builder func(Config) Printer
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type Config struct {
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Name string
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Argv []string
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Pkg string
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}
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func NewDefaultConfig() Config {
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return Config{
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Name: "avo",
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Pkg: pkg(),
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}
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}
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func NewArgvConfig() Config {
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return Config{
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Argv: os.Args,
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Pkg: pkg(),
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}
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}
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// NewGoRunConfig produces a Config for a generator that's expected to be
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// executed via "go run ...".
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func NewGoRunConfig() Config {
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path := mainfile()
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if path == "" {
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return NewDefaultConfig()
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}
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argv := []string{"go", "run", filepath.Base(path)}
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if len(os.Args) > 1 {
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argv = append(argv, os.Args[1:]...)
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}
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return Config{
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Argv: argv,
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Pkg: pkg(),
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}
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}
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func (c Config) GeneratedBy() string {
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if c.Argv == nil {
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return c.Name
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}
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return fmt.Sprintf("command: %s", strings.Join(c.Argv, " "))
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}
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func (c Config) GeneratedWarning() string {
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return fmt.Sprintf("Code generated by %s. DO NOT EDIT.", c.GeneratedBy())
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}
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// mainfile attempts to determine the file path of the main function by
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// inspecting the stack. Returns empty string on failure.
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func mainfile() string {
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if m := stack.Main(); m != nil {
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return m.File
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}
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return ""
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}
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// pkg guesses the name of the package from the working directory.
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func pkg() string {
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if cwd, err := os.Getwd(); err == nil {
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return filepath.Base(cwd)
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}
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return ""
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}
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