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// Package gomplate is a template renderer which supports a number of datasources,
// and includes hundreds of built-in functions.
package gomplate
import (
"bytes"
"context"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"text/template"
"time"
"github.com/hairyhenderson/gomplate/v3/data"
"github.com/hairyhenderson/gomplate/v3/internal/config"
"github.com/pkg/errors"
"github.com/rs/zerolog"
)
// gomplate -
type gomplate struct {
tmplctx interface{}
funcMap template.FuncMap
nestedTemplates config.Templates
leftDelim, rightDelim string
}
// runTemplate -
func (g *gomplate) runTemplate(ctx context.Context, t *tplate) error {
tmpl, err := t.toGoTemplate(ctx, g)
if err != nil {
return err
}
wr, ok := t.target.(io.Closer)
if ok && wr != os.Stdout {
defer wr.Close()
}
return tmpl.Execute(t.target, g.tmplctx)
}
// newGomplate -
func newGomplate(funcMap template.FuncMap, leftDelim, rightDelim string, nested config.Templates, tctx interface{}) *gomplate {
return &gomplate{
leftDelim: leftDelim,
rightDelim: rightDelim,
funcMap: funcMap,
nestedTemplates: nested,
tmplctx: tctx,
}
}
// RunTemplates - run all gomplate templates specified by the given configuration
//
// Deprecated: use Run instead
func RunTemplates(o *Config) error {
cfg, err := o.toNewConfig()
if err != nil {
return err
}
return Run(context.Background(), cfg)
}
// Run all gomplate templates specified by the given configuration
func Run(ctx context.Context, cfg *config.Config) error {
log := zerolog.Ctx(ctx)
Metrics = newMetrics()
defer runCleanupHooks()
// apply defaults before validation
cfg.ApplyDefaults()
err := cfg.Validate()
if err != nil {
return fmt.Errorf("failed to validate config: %w\n%+v", err, cfg)
}
d := data.FromConfig(ctx, cfg)
log.Debug().Str("data", fmt.Sprintf("%+v", d)).Msg("created data from config")
addCleanupHook(d.Cleanup)
aliases := []string{}
for k := range cfg.Context {
aliases = append(aliases, k)
}
c, err := createTmplContext(ctx, aliases, d)
if err != nil {
return err
}
funcMap := CreateFuncs(ctx, d)
err = bindPlugins(ctx, cfg, funcMap)
if err != nil {
return err
}
g := newGomplate(funcMap, cfg.LDelim, cfg.RDelim, cfg.Templates, c)
return g.runTemplates(ctx, cfg)
}
func (g *gomplate) runTemplates(ctx context.Context, cfg *config.Config) error {
start := time.Now()
tmpl, err := gatherTemplates(ctx, cfg, chooseNamer(cfg, g))
Metrics.GatherDuration = time.Since(start)
if err != nil {
Metrics.Errors++
return fmt.Errorf("failed to gather templates for rendering: %w", err)
}
Metrics.TemplatesGathered = len(tmpl)
start = time.Now()
defer func() { Metrics.TotalRenderDuration = time.Since(start) }()
for _, t := range tmpl {
tstart := time.Now()
err := g.runTemplate(ctx, t)
Metrics.RenderDuration[t.name] = time.Since(tstart)
if err != nil {
Metrics.Errors++
return fmt.Errorf("failed to render template %s: %w", t.name, err)
}
Metrics.TemplatesProcessed++
}
return nil
}
func chooseNamer(cfg *config.Config, g *gomplate) func(context.Context, string) (string, error) {
if cfg.OutputMap == "" {
return simpleNamer(cfg.OutputDir)
}
return mappingNamer(cfg.OutputMap, g)
}
func simpleNamer(outDir string) func(ctx context.Context, inPath string) (string, error) {
return func(_ context.Context, inPath string) (string, error) {
outPath := filepath.Join(outDir, inPath)
return filepath.Clean(outPath), nil
}
}
func mappingNamer(outMap string, g *gomplate) func(context.Context, string) (string, error) {
return func(ctx context.Context, inPath string) (string, error) {
out := &bytes.Buffer{}
t := &tplate{
name: "<OutputMap>",
contents: outMap,
target: out,
}
tpl, err := t.toGoTemplate(ctx, g)
if err != nil {
return "", err
}
tctx := &tmplctx{}
// nolint: gocritic
switch c := g.tmplctx.(type) {
case *tmplctx:
for k, v := range *c {
if k != "in" && k != "ctx" {
(*tctx)[k] = v
}
}
}
(*tctx)["ctx"] = g.tmplctx
(*tctx)["in"] = inPath
err = tpl.Execute(t.target, tctx)
if err != nil {
return "", errors.Wrapf(err, "failed to render outputMap with ctx %+v and inPath %s", tctx, inPath)
}
return filepath.Clean(strings.TrimSpace(out.String())), nil
}
}
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