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package cmd
import (
"context"
"io"
"os"
"os/exec"
"os/signal"
"github.com/hairyhenderson/gomplate/v4"
"github.com/hairyhenderson/gomplate/v4/env"
"github.com/hairyhenderson/gomplate/v4/internal/datafs"
"github.com/hairyhenderson/gomplate/v4/version"
"github.com/rs/zerolog"
"github.com/spf13/cobra"
)
// postRunExec - if templating succeeds, the command following a '--' will be executed
func postRunExec(ctx context.Context, args []string, stdin io.Reader, stdout, stderr io.Writer) error {
if len(args) > 0 {
log := zerolog.Ctx(ctx)
log.Debug().Strs("args", args).Msg("running post-exec command")
//nolint:govet
ctx, cancel := context.WithCancel(ctx)
defer cancel()
name := args[0]
args = args[1:]
c := exec.CommandContext(ctx, name, args...)
c.Stdin = stdin
c.Stderr = stderr
c.Stdout = stdout
// make sure all signals are propagated
sigs := make(chan os.Signal, 1)
signal.Notify(sigs)
err := c.Start()
if err != nil {
return err
}
go func() {
select {
case sig := <-sigs:
// Pass signals to the sub-process
if c.Process != nil {
_ = c.Process.Signal(sig)
}
case <-ctx.Done():
}
}()
return c.Wait()
}
return nil
}
// optionalExecArgs - implements cobra.PositionalArgs. Allows extra args following
// a '--', but not otherwise.
func optionalExecArgs(cmd *cobra.Command, args []string) error {
if cmd.ArgsLenAtDash() == 0 {
return nil
}
return cobra.NoArgs(cmd, args)
}
// NewGomplateCmd -
func NewGomplateCmd() *cobra.Command {
rootCmd := &cobra.Command{
Use: "gomplate",
Short: "Process text files with Go templates",
Version: version.Version,
RunE: func(cmd *cobra.Command, args []string) error {
if v, _ := cmd.Flags().GetBool("verbose"); v {
zerolog.SetGlobalLevel(zerolog.DebugLevel)
}
ctx := cmd.Context()
log := zerolog.Ctx(ctx)
cfg, err := loadConfig(ctx, cmd, args)
if err != nil {
return err
}
if cfg.Experimental {
log.UpdateContext(func(c zerolog.Context) zerolog.Context {
return c.Bool("experimental", true)
})
log.Info().Msg("experimental functions and features enabled!")
ctx = gomplate.SetExperimental(ctx)
}
log.Debug().Msgf("starting %s", cmd.Name())
log.Debug().
Str("version", version.Version).
Str("build", version.GitCommit).
Msgf("config is:\n%v", cfg)
err = gomplate.Run(ctx, cfg)
cmd.SilenceErrors = true
cmd.SilenceUsage = true
log.Debug().Int("templatesRendered", gomplate.Metrics.TemplatesProcessed).
Int("errors", gomplate.Metrics.Errors).
Dur("duration", gomplate.Metrics.TotalRenderDuration).
Msg("completed rendering")
if err != nil {
return err
}
return postRunExec(ctx, cfg.PostExec, cfg.PostExecInput, cmd.OutOrStdout(), cmd.ErrOrStderr())
},
Args: optionalExecArgs,
}
return rootCmd
}
// InitFlags - initialize the various flags and help strings on the command.
// Note that the defaults set here are ignored, and instead defaults from
// *config.Config's ApplyDefaults method are used instead. Changes here must be
// reflected there as well.
func InitFlags(command *cobra.Command) {
command.Flags().SortFlags = false
command.Flags().StringSliceP("datasource", "d", nil, "`datasource` in alias=URL form. Specify multiple times to add multiple sources.")
command.Flags().StringSliceP("datasource-header", "H", nil, "HTTP `header` field in 'alias=Name: value' form to be provided on HTTP-based data sources. Multiples can be set.")
command.Flags().StringSliceP("context", "c", nil, "pre-load a `datasource` into the context, in alias=URL form. Use the special alias `.` to set the root context.")
command.Flags().StringSlice("plugin", nil, "plug in an external command as a function in name=path form. Can be specified multiple times")
command.Flags().StringSliceP("file", "f", []string{"-"}, "Template `file` to process. Omit to use standard input, or use --in or --input-dir")
command.Flags().StringP("in", "i", "", "Template `string` to process (alternative to --file and --input-dir)")
command.Flags().String("input-dir", "", "`directory` which is examined recursively for templates (alternative to --file and --in)")
command.Flags().StringSlice("exclude", []string{}, "glob of files to not parse")
command.Flags().StringSlice("include", []string{}, "glob of files to parse")
command.Flags().StringSliceP("out", "o", []string{"-"}, "output `file` name. Omit to use standard output.")
command.Flags().StringSliceP("template", "t", []string{}, "Additional template file(s)")
command.Flags().String("output-dir", ".", "`directory` to store the processed templates. Only used for --input-dir")
command.Flags().String("output-map", "", "Template `string` to map the input file to an output path")
command.Flags().String("chmod", "", "set the mode for output file(s). Omit to inherit from input file(s)")
command.Flags().Bool("exec-pipe", false, "pipe the output to the post-run exec command")
// these are only set for the help output - these defaults aren't actually used
ldDefault := env.Getenv("GOMPLATE_LEFT_DELIM", "{{")
rdDefault := env.Getenv("GOMPLATE_RIGHT_DELIM", "}}")
command.Flags().String("left-delim", ldDefault, "override the default left-`delimiter` [$GOMPLATE_LEFT_DELIM]")
command.Flags().String("right-delim", rdDefault, "override the default right-`delimiter` [$GOMPLATE_RIGHT_DELIM]")
command.Flags().String("missing-key", "error", "Control the behavior during execution if a map is indexed with a key that is not present in the map. error (default) - return an error, zero - fallback to zero value, default/invalid - print <no value>")
command.Flags().Bool("experimental", false, "enable experimental features [$GOMPLATE_EXPERIMENTAL]")
command.Flags().BoolP("verbose", "V", false, "output extra information about what gomplate is doing")
command.Flags().String("config", defaultConfigFile, "config file (overridden by commandline flags)")
}
// Main -
func Main(ctx context.Context, args []string, stdin io.Reader, stdout, stderr io.Writer) error {
ctx = initLogger(ctx, stderr)
// inject default filesystem provider if it hasn't already been provided in
// the context
if datafs.FSProviderFromContext(ctx) == nil {
ctx = datafs.ContextWithFSProvider(ctx, gomplate.DefaultFSProvider)
}
command := NewGomplateCmd()
InitFlags(command)
command.SetArgs(args)
command.SetIn(stdin)
command.SetOut(stdout)
command.SetErr(stderr)
err := command.ExecuteContext(ctx)
if err != nil {
log := zerolog.Ctx(ctx)
log.Error().Err(err).Send()
}
return err
}
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