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/*
The gomplate command
*/
package main
import (
"errors"
"fmt"
"os"
"os/exec"
"github.com/hairyhenderson/gomplate"
"github.com/hairyhenderson/gomplate/env"
"github.com/hairyhenderson/gomplate/version"
"github.com/spf13/cobra"
)
var (
printVer bool
verbose bool
opts gomplate.Config
)
func validateOpts(cmd *cobra.Command, args []string) error {
if cmd.Flag("in").Changed && cmd.Flag("file").Changed {
return errors.New("--in and --file may not be used together")
}
if len(opts.InputFiles) != len(opts.OutputFiles) {
return fmt.Errorf("Must provide same number of --out (%d) as --file (%d) options", len(opts.OutputFiles), len(opts.InputFiles))
}
if cmd.Flag("input-dir").Changed && (cmd.Flag("in").Changed || cmd.Flag("file").Changed) {
return errors.New("--input-dir can not be used together with --in or --file")
}
if cmd.Flag("output-dir").Changed {
if cmd.Flag("out").Changed {
return errors.New("--output-dir can not be used together with --out")
}
if !cmd.Flag("input-dir").Changed {
return errors.New("--input-dir must be set when --output-dir is set")
}
}
return nil
}
func printVersion(name string) {
fmt.Printf("%s version %s\n", name, version.Version)
}
// postRunExec - if templating succeeds, the command following a '--' will be executed
func postRunExec(cmd *cobra.Command, args []string) error {
if len(args) > 0 {
name := args[0]
args = args[1:]
// nolint: gosec
c := exec.Command(name, args...)
c.Stdin = os.Stdin
c.Stderr = os.Stderr
c.Stdout = os.Stdout
return c.Run()
}
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)
}
func newGomplateCmd() *cobra.Command {
rootCmd := &cobra.Command{
Use: "gomplate",
Short: "Process text files with Go templates",
PreRunE: validateOpts,
RunE: func(cmd *cobra.Command, args []string) error {
if printVer {
printVersion(cmd.Name())
return nil
}
if verbose {
// nolint: errcheck
fmt.Fprintf(os.Stderr, "%s version %s, build %s (%v)\nconfig is:\n%s\n\n",
cmd.Name(), version.Version, version.GitCommit, version.BuildDate,
&opts)
}
err := gomplate.RunTemplates(&opts)
cmd.SilenceErrors = true
cmd.SilenceUsage = true
if verbose {
// nolint: errcheck
fmt.Fprintf(os.Stderr, "rendered %d template(s) with %d error(s) in %v\n",
gomplate.Metrics.TemplatesProcessed, gomplate.Metrics.Errors, gomplate.Metrics.TotalRenderDuration)
}
return err
},
PostRunE: postRunExec,
Args: optionalExecArgs,
}
return rootCmd
}
func initFlags(command *cobra.Command) {
command.Flags().SortFlags = false
command.Flags().StringArrayVarP(&opts.DataSources, "datasource", "d", nil, "`datasource` in alias=URL form. Specify multiple times to add multiple sources.")
command.Flags().StringArrayVarP(&opts.DataSourceHeaders, "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().StringArrayVarP(&opts.InputFiles, "file", "f", []string{"-"}, "Template `file` to process. Omit to use standard input, or use --in or --input-dir")
command.Flags().StringVarP(&opts.Input, "in", "i", "", "Template `string` to process (alternative to --file and --input-dir)")
command.Flags().StringVar(&opts.InputDir, "input-dir", "", "`directory` which is examined recursively for templates (alternative to --file and --in)")
command.Flags().StringArrayVar(&opts.ExcludeGlob, "exclude", []string{}, "glob of files to not parse")
command.Flags().StringArrayVarP(&opts.OutputFiles, "out", "o", []string{"-"}, "output `file` name. Omit to use standard output.")
command.Flags().StringArrayVarP(&opts.Templates, "template", "t", []string{}, "Additional template file(s)")
command.Flags().StringVar(&opts.OutputDir, "output-dir", ".", "`directory` to store the processed templates. Only used for --input-dir")
command.Flags().StringVar(&opts.OutMode, "chmod", "", "set the mode for output file(s). Omit to inherit from input file(s)")
ldDefault := env.Getenv("GOMPLATE_LEFT_DELIM", "{{")
rdDefault := env.Getenv("GOMPLATE_RIGHT_DELIM", "}}")
command.Flags().StringVar(&opts.LDelim, "left-delim", ldDefault, "override the default left-`delimiter` [$GOMPLATE_LEFT_DELIM]")
command.Flags().StringVar(&opts.RDelim, "right-delim", rdDefault, "override the default right-`delimiter` [$GOMPLATE_RIGHT_DELIM]")
command.Flags().BoolVarP(&verbose, "verbose", "V", false, "output extra information about what gomplate is doing")
command.Flags().BoolVarP(&printVer, "version", "v", false, "print the version")
}
func main() {
command := newGomplateCmd()
initFlags(command)
if err := command.Execute(); err != nil {
// nolint: errcheck
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
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