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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/README.md b/README.md new file mode 100644 index 0000000..244345c --- /dev/null +++ b/README.md @@ -0,0 +1,29 @@ +# goproc + +Apply [Go templates](https://golang.org/pkg/text/template/#hdr-Text_and_spaces) to JSON or YAML data. + +## Build + + go build + +## Usage + + goproc + +## Go template functions extensions + +The following functions are added in addition to the standard functions. + +### `jsonptr` + +To ease the extraction of data, `jsonptr` allows to express data location using +JSON Pointer ([RFC 6901](https://tools.ietf.org/html/rfc6901)). + +Usage: + + {{ jsonptr . "pointer" }} + +Examples: + +1. [->template](testdata/02.gotml) [->data](testdata/02.json) +2. [->template](testdata/03.gotml) [->data](testdata/03.json) diff --git a/main.go b/main.go new file mode 100644 index 0000000..df1a11b --- /dev/null +++ b/main.go @@ -0,0 +1,135 @@ +package main + +import ( + "encoding/json" + "errors" + "flag" + "fmt" + "io" + "log" + "os" + "path/filepath" + "text/template" + + "github.com/dolmen-go/flagx" + "github.com/dolmen-go/jsonptr" + yaml "gopkg.in/yaml.v2" +) + +func main() { + log.SetPrefix("") + log.SetFlags(0) + + if err := _main(); err != nil { + log.Println(err) + os.Exit(1) + } +} + +func _main() error { + + var templates []string + flag.Var(flagx.Slice(&templates, "", nil), "i", "input template `file`") + + loadData := loadJSON + flag.Var(flagx.BoolFunc(func(stdinAsYAML bool) error { + if stdinAsYAML { + loadData = loadYAML + } else { + loadData = loadJSON + } + return nil + }), "yaml", "load data from stdin as YAML (default is JSON)") + + flag.Parse() + + // TODO handle -version + + args := flag.Args() + if len(templates) == 0 { + if len(args) < 1 { + return errors.New("missing input template arguments") + } + templates = args[:1] + args = args[1:] + } + + tmpl := template.New("") + tmpl.Funcs(template.FuncMap{ + "jsonptr": jsonptr.Get, + }) + + var err error + _, err = tmpl.ParseFiles(templates...) + if err != nil { + return err + } + + var data interface{} + if len(args) > 0 { + data, err = loadFile(args[0]) + } else { + data, err = loadData(os.Stdin) + } + if err != nil { + return err + } + + return tmpl.ExecuteTemplate(os.Stdout, filepath.Base(templates[0]), data) +} + +func loadFile(pth string) (interface{}, error) { + f, err := os.Open(pth) + if err != nil { + return nil, err + } + defer f.Close() + + switch filepath.Ext(pth) { + case ".json": + return loadJSON(f) + case ".yaml", ".yml": + return loadYAML(f) + default: + return nil, errors.New("unsupported file extension") + } +} + +func loadJSON(r io.Reader) (data interface{}, err error) { + err = json.NewDecoder(r).Decode(&data) + if err != nil { + return nil, err + } + return data, err +} + +func loadYAML(r io.Reader) (data interface{}, err error) { + dec := yaml.NewDecoder(r) + dec.SetStrict(true) + err = dec.Decode(&data) + if err != nil { + return nil, err + } + return fixMaps(data), err +} + +func fixMaps(v interface{}) interface{} { + switch v := v.(type) { + case nil, bool, string, int, int64, float64: + case []interface{}: + for i, item := range v { + v[i] = fixMaps(item) + } + case map[interface{}]interface{}: + m := make(map[string]interface{}, len(v)) + for key, val := range v { + m[fmt.Sprint(key)] = fixMaps(val) + } + return m + case map[string]interface{}: + for key, value := range v { + v[key] = fixMaps(value) + } + } + return v +} diff --git a/testdata/01.gotmpl b/testdata/01.gotmpl new file mode 100644 index 0000000..a541c92 --- /dev/null +++ b/testdata/01.gotmpl @@ -0,0 +1,2 @@ +Hello, {{.}}! +{{/* vim: syntax=gotexttmpl: */ -}} \ No newline at end of file diff --git a/testdata/01.json b/testdata/01.json new file mode 100644 index 0000000..56bcea4 --- /dev/null +++ b/testdata/01.json @@ -0,0 +1 @@ +"Olivier" \ No newline at end of file diff --git a/testdata/02.gotmpl b/testdata/02.gotmpl new file mode 100644 index 0000000..5fe8d2a --- /dev/null +++ b/testdata/02.gotmpl @@ -0,0 +1,2 @@ +Hello, {{ jsonptr . "" }}! +{{/* vim: syntax=gotexttmpl: */ -}} \ No newline at end of file diff --git a/testdata/02.json b/testdata/02.json new file mode 100644 index 0000000..56bcea4 --- /dev/null +++ b/testdata/02.json @@ -0,0 +1 @@ +"Olivier" \ No newline at end of file diff --git a/testdata/03.gotmpl b/testdata/03.gotmpl new file mode 100644 index 0000000..b394de3 --- /dev/null +++ b/testdata/03.gotmpl @@ -0,0 +1,2 @@ +Hello, {{ jsonptr . "/name" }}! +{{/* vim: syntax=gotexttmpl: */ -}} \ No newline at end of file diff --git a/testdata/03.json b/testdata/03.json new file mode 100644 index 0000000..3f1fddd --- /dev/null +++ b/testdata/03.json @@ -0,0 +1,3 @@ +{ + "name": "Olivier" +} \ No newline at end of file