dati

dati.go (7567B)

---

 package main
 
 /*
 	Copyright (C) 2021 gearsix <gearsix@tuta.io>
 
 	This program is free software: you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by
 	the Free Software Foundation, either version 3 of the License, or
 	at your option) any later version.
 
 	This program is distributed in the hope that it will be useful,
 	but WITHOUT ANY WARRANTY; without even the implied warranty of
 	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 	GNU General Public License for more details.
 
 	You should have received a copy of the GNU General Public License
 	along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
 import (
 	"bufio"
 	"bytes"
 	"fmt"
 	"notabug.org/gearsix/dati"
 	"os"
 	"path/filepath"
 	"strings"
 )
 
 // Data is just a generic map for key/value data
 type Data map[string]interface{}
 
 type options struct {
 	RootPath        string
 	PartialPaths    []string
 	GlobalDataPaths []string
 	DataPaths       []string
 	DataKey         string
 	SortData        string
 	ConfigFile      string
 }
 
 var opts options
 var cwd string
 
 func warn(err error, msg string, args ...interface{}) {
 	warning := "WARNING "
 	if len(msg) > 0 {
 		warning += strings.TrimSuffix(fmt.Sprintf(msg, args...), "\n")
 		if err != nil {
 			warning += ": "
 		}
 	}
 	if err != nil {
 		warning += err.Error()
 	}
 	fmt.Println(warning)
 }
 
 func assert(err error, msg string, args ...interface{}) {
 	if err != nil {
 		fmt.Printf("ERROR %s\n%s\n", strings.TrimSuffix(fmt.Sprintf(msg, args...), "\n"), err)
 		os.Exit(1)
 	}
 }
 
 func basedir(path string) string {
 	if !filepath.IsAbs(path) {
 		path = filepath.Join(cwd, path)
 	}
 	return path
 }
 
 func init() {
 	if len(os.Args) <= 1 {
 		fmt.Println("nothing to do")
 		os.Exit(0)
 	}
 
 	opts = parseArgs(os.Args[1:], options{})
 	if len(opts.ConfigFile) != 0 {
 		cwd = filepath.Dir(opts.ConfigFile)
 		opts = parseConfig(opts.ConfigFile, opts)
 	}
 	opts = setDefaultOptions(opts)
 }
 
 func main() {
 	var err error
 	var global Data
 	var data []Data
 	var template dati.Template
 	var out bytes.Buffer
 
 	opts.GlobalDataPaths = loadFilePaths(opts.GlobalDataPaths...)
 	for _, path := range opts.GlobalDataPaths {
 		var d Data
 		err = dati.LoadDataFilepath(path, &d)
 		assert(err, "failed to load global data '%s'", path)
 		data = append(data, d)
 	}
 	global = mergeData(data)
 
 	opts.DataPaths = loadFilePaths(opts.DataPaths...)
 	opts.DataPaths, err = dati.SortFileList(opts.DataPaths, opts.SortData)
 	if err != nil {
 		warn(err, "failed to sort data files")
 	}
 	data = make([]Data, 0)
 	for _, path := range opts.DataPaths {
 		var d Data
 		err = dati.LoadDataFilepath(path, &d)
 		assert(err, "failed to load data '%s'", path)
 		data = append(data, d)
 	}
 	global[opts.DataKey] = data
 
 	template, err = dati.LoadTemplateFilepath(opts.RootPath, opts.PartialPaths...)
 	assert(err, "unable to load templates")
 
 	out, err = template.Execute(global)
 	assert(err, "failed to execute template '%s'", opts.RootPath)
 	fmt.Print(out.String())
 
 	return
 }
 
 func help() {
 	fmt.Print("Usage: dati [OPTIONS]\n\n")
 
 	fmt.Print("Options")
 	fmt.Print(`
    -r path, -root path  
     path of template file to execute against.
 
   -p path..., -partial path...  
     path of (multiple) template files that are called upon by at least one
     root template. If a directory is passed then all files within that
     directory will (recursively) be loaded.
 
   -gd path..., -global-data path...  
     path of (multiple) data files to load as "global data". If a directory is
     passed then all files within that directory will (recursively) be loaded.
 
   -d path..., -data path...  
    path of (multiple) data files to load as "data". If a directory is passed
    then all files within that directory will (recursively) be loaded.
 
   -dk name, -data-key name  
     set the name of the key used for the generated array of data (default:
     "data")
 
   -sd attribute, -sort-data attribute  
     The file attribute to order data files by. If no value is provided, the data
     will be provided in the order it's loaded.
     Accepted values: "filename", "modified".
     A suffix can be appended to each value to set the sort order: "-asc" (for
     ascending), "-desc" (for descending). If not specified, this defaults to
     "-asc".
   -cfg file, -config file  
     A data file to provide default values for the above options (see CONFIG).
 
 `)
 
 	fmt.Println("See doc/dati.txt for further details")
 }
 
 // custom arg parser because golang.org/pkg/flag doesn't support list args
 func parseArgs(args []string, existing options) (o options) {
 	o = existing
 	var flag string
 	for a := 0; a < len(args); a++ {
 		arg := args[a]
 		if arg[0] == '-' && flag != "--" {
 			flag = arg
 			ndelims := 0
 			for len(flag) > 0 && flag[0] == '-' {
 				flag = flag[1:]
 				ndelims++
 			}
 
 			if ndelims > 2 {
 				warn(nil, "bad flag syntax: '%s'", arg)
 				flag = ""
 			}
 
 			if strings.Contains(flag, "=") {
 				split := strings.SplitN(flag, "=", 2)
 				flag = split[0]
 				args[a] = split[1]
 				a--
 			}
 
 			// set valid any flags that don't take arguments here
 			if flag == "h" || flag == "help" {
 				help()
 				os.Exit(0)
 			}
 		} else if (flag == "r" || flag == "root") && len(o.RootPath) == 0 {
 			o.RootPath = basedir(arg)
 		} else if flag == "p" || flag == "partial" {
 			o.PartialPaths = append(o.PartialPaths, basedir(arg))
 		} else if flag == "gd" || flag == "globaldata" {
 			o.GlobalDataPaths = append(o.GlobalDataPaths, basedir(arg))
 		} else if flag == "d" || flag == "data" {
 			o.DataPaths = append(o.DataPaths, basedir(arg))
 		} else if flag == "dk" || flag == "datakey" && len(o.DataKey) == 0 {
 			o.DataKey = arg
 		} else if flag == "sd" || flag == "sortdata" && len(o.SortData) == 0 {
 			o.SortData = arg
 		} else if flag == "cfg" || flag == "config" && len(o.ConfigFile) == 0 {
 			o.ConfigFile = basedir(arg)
 		} else if len(flag) == 0 {
 			// skip unknown flag arguments
 		} else {
 			warn(nil, "ignoring flag: '%s'", flag)
 			flag = ""
 		}
 	}
 
 	return
 }
 
 func parseConfig(fpath string, existing options) options {
 	var err error
 	var cfgf *os.File
 	if cfgf, err = os.Open(fpath); err != nil {
 		warn(err, "error loading config file '%s'", fpath)
 	}
 	defer cfgf.Close()
 
 	var args []string
 	scanf := bufio.NewScanner(cfgf)
 	for scanf.Scan() {
 		for i, arg := range strings.Split(scanf.Text(), "=") {
 			arg = strings.TrimSpace(arg)
 			if i == 0 {
 				arg = "-" + arg
 			}
 			args = append(args, arg)
 		}
 	}
 	return parseArgs(args, existing)
 }
 
 func setDefaultOptions(o options) options {
 	if len(o.SortData) == 0 {
 		o.SortData = "filename"
 	}
 	if len(o.DataKey) == 0 {
 		o.DataKey = "data"
 	}
 	return o
 }
 
 // load glob & dir filepaths as individual filepaths
 func loadFilePaths(paths ...string) (filepaths []string) {
 	for _, path := range paths {
 		var err error
 		if strings.Contains(path, "*") {
 			var glob []string
 			glob, err = filepath.Glob(path)
 			assert(err, "failed to glob '%s'", path)
 			for _, p := range glob {
 				filepaths = append(filepaths, p)
 			}
 		} else {
 			err = filepath.Walk(path,
 				func(p string, info os.FileInfo, e error) error {
 					if e == nil && !info.IsDir() {
 						filepaths = append(filepaths, p)
 					}
 					return e
 				})
 		}
 		if err != nil {
 			assert(err, "failed to load filepaths for '%s'", path)
 		}
 	}
 	return
 }
 
 func mergeData(data []Data) (merged Data) {
 	merged = make(Data)
 	for _, d := range data {
 		for key, val := range d {
 			if merged[key] == nil {
 				merged[key] = val
 			} else {
 				warn(nil, "merge conflict for global data key: '%s'", key)
 			}
 		}
 	}
 	return
 }