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generate.go
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generate.go
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package golang
import (
_ "embed"
"fmt"
"path/filepath"
"sort"
"text/template"
"github.com/eddiefisher/pggen/internal/casing"
"github.com/eddiefisher/pggen/internal/codegen"
)
// GenerateOptions are options to control generated Go output.
type GenerateOptions struct {
GoPkg string
OutputDir string
// A map of lowercase acronyms to the upper case equivalent, like:
// "api" => "API".
Acronyms map[string]string
// A map from a Postgres type name to a fully qualified Go type.
TypeOverrides map[string]string
}
// Generate emits generated Go files for each of the queryFiles.
func Generate(opts GenerateOptions, queryFiles []codegen.QueryFile) error {
pkgName := opts.GoPkg
if pkgName == "" {
pkgName = filepath.Base(opts.OutputDir)
}
caser := casing.NewCaser()
caser.AddAcronyms(opts.Acronyms)
templater := NewTemplater(TemplaterOpts{
Caser: caser,
Resolver: NewTypeResolver(caser, opts.TypeOverrides),
Pkg: pkgName,
})
templatedFiles, err := templater.TemplateAll(queryFiles)
if err != nil {
return fmt.Errorf("template all: %w", err)
}
// Order for reproducible results.
sort.Slice(templatedFiles, func(i, j int) bool {
return templatedFiles[i].SourcePath < templatedFiles[j].SourcePath
})
// Link each child to the package. Necessary so the leader can define all
// Querier methods.
pkg := TemplatedPackage{Files: templatedFiles}
for i := range templatedFiles {
templatedFiles[i].Pkg = pkg
}
tmpl, err := parseQueryTemplate()
if err != nil {
return fmt.Errorf("parse generated Go code template: %w", err)
}
emitter := NewEmitter(opts.OutputDir, tmpl)
if err := emitter.EmitAllQueryFiles(templatedFiles); err != nil {
return fmt.Errorf("emit generated Go code: %w", err)
}
return nil
}
//go:embed query.gotemplate
var queryTemplate string
func parseQueryTemplate() (*template.Template, error) {
tmpl, err := template.New("gen_query").Parse(queryTemplate)
if err != nil {
return nil, fmt.Errorf("parse query.gotemplate: %w", err)
}
return tmpl, nil
}