/
write.go
187 lines (146 loc) · 4.18 KB
/
write.go
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package file
import (
"errors"
"fmt"
"os"
"strings"
"github.com/lxc/incus/internal/server/db/generate/lex"
)
// Reset an auto-generated source file, writing a new empty file header.
func Reset(path string, imports []string, buildComment string, iface bool) error {
// A new line needs to be appended after the build comment.
if buildComment != "" {
buildComment = fmt.Sprintf(`%s
`, buildComment)
}
if iface {
err := resetInterface(path, imports, buildComment)
if err != nil {
return err
}
}
content := fmt.Sprintf(`%spackage %s
// The code below was generated by %s - DO NOT EDIT!
import (
`, buildComment, os.Getenv("GOPACKAGE"), os.Args[0])
for _, uri := range imports {
content += fmt.Sprintf("\t%q\n", uri)
}
content += ")\n\n"
// FIXME: we should only import what's needed.
content += "var _ = api.ServerEnvironment{}\n"
bytes := []byte(content)
var err error
if path == "-" {
_, err = os.Stdout.Write(bytes)
} else {
err = os.WriteFile(path, []byte(content), 0644)
}
if err != nil {
return fmt.Errorf("Reset target source file %q: %w", path, err)
}
return nil
}
func resetInterface(path string, imports []string, buildComment string) error {
if strings.HasSuffix(path, "mapper.go") {
parts := strings.Split(path, ".")
interfacePath := strings.Join(parts[:len(parts)-2], ".") + ".interface.mapper.go"
content := fmt.Sprintf("%spackage %s", buildComment, os.Getenv("GOPACKAGE"))
err := os.WriteFile(interfacePath, []byte(content), 0644)
return err
}
return nil
}
// Append a code snippet to a file.
func Append(entity string, path string, snippet Snippet, iface bool) error {
if iface {
err := appendInterface(entity, path, snippet)
if err != nil {
return err
}
}
buffer := newBuffer()
buffer.N()
err := snippet.Generate(buffer)
if err != nil {
return fmt.Errorf("Generate code snippet: %w", err)
}
var file *os.File
if path == "-" {
file = os.Stdout
} else {
file, err = os.OpenFile(path, os.O_APPEND|os.O_WRONLY, 0644)
if err != nil {
return fmt.Errorf("Open target source code file %q: %w", path, err)
}
defer func() { _ = file.Close() }()
}
bytes, err := buffer.code()
if err != nil {
return err
}
_, err = file.Write(bytes)
if err != nil {
return fmt.Errorf("Append snippet to target source code file %q: %w", path, err)
}
// Return any errors on close if file is not stdout.
if path != "-" {
return file.Close()
}
return nil
}
func appendInterface(entity string, path string, snippet Snippet) error {
if !strings.HasSuffix(path, ".mapper.go") {
return nil
}
parts := strings.Split(path, ".")
interfacePath := strings.Join(parts[:len(parts)-2], ".") + ".interface.mapper.go"
stat, err := os.Stat(interfacePath)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return nil
}
return fmt.Errorf("could not get file info for path %q: %w", interfacePath, err)
}
buffer := newBuffer()
file, err := os.OpenFile(interfacePath, os.O_RDWR, 0644)
if err != nil {
return fmt.Errorf("Open target source code file %q: %w", interfacePath, err)
}
defer func() { _ = file.Close() }()
err = snippet.GenerateSignature(buffer)
if err != nil {
return fmt.Errorf("Generate interface snippet: %w", err)
}
bytes, err := buffer.code()
if err != nil {
return err
}
declaration := fmt.Sprintf("type %sGenerated interface {", lex.Camel(entity))
content := make([]byte, stat.Size())
_, err = file.Read(content)
if err != nil {
return fmt.Errorf("Could not read interface file %q: %w", interfacePath, err)
}
firstWrite := !strings.Contains(string(content), declaration)
if firstWrite {
// If this is the first signature write to the file, append the whole thing.
_, err = file.WriteAt(bytes, stat.Size())
} else {
// If an interface already exists, just append the method, omitting everything before the first '{'.
startIndex := 0
for i := range bytes {
// type ObjectGenerated interface {
if string(bytes[i]) == "{" {
startIndex = i + 1
break
}
}
// overwrite the closing brace.
_, err = file.WriteAt(bytes[startIndex:], stat.Size()-2)
}
if err != nil {
return fmt.Errorf("Append snippet to target source code file %q: %w", interfacePath, err)
}
return file.Close()
}