github.com/dancsecs/gotomd@v0.0.0-20240310162206-65c4805cf510/cmd_parse.go (about)

     1  /*
     2     Golang To Github Markdown Utility: gotomd
     3     Copyright (C) 2023, 2024 Leslie Dancsecs
     4  
     5     This program is free software: you can redistribute it and/or modify
     6     it under the terms of the GNU General Public License as published by
     7     the Free Software Foundation, either version 3 of the License, or
     8     (at your option) any later version.
     9  
    10     This program is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13     GNU General Public License for more details.
    14  
    15     You should have received a copy of the GNU General Public License
    16     along with this program.  If not, see <https://www.gnu.org/licenses/>.
    17  */
    18  
    19  package main
    20  
    21  import (
    22  	"fmt"
    23  	"os"
    24  	"path/filepath"
    25  	"regexp"
    26  	"strings"
    27  )
    28  
    29  func parseCmd(cmd string) (string, string, error) {
    30  	if !strings.HasPrefix(cmd, "./") {
    31  		return "", "", fmt.Errorf("%w: %q", ErrInvalidRelativeDir, cmd)
    32  	}
    33  
    34  	lastSeparatorPos := strings.LastIndex(cmd, string(os.PathSeparator))
    35  	dir := strings.TrimSpace(cmd[:lastSeparatorPos])
    36  	action := strings.TrimSpace(cmd[lastSeparatorPos+1:])
    37  	s, err := os.Stat(dir)
    38  
    39  	if err != nil || !s.IsDir() {
    40  		return "",
    41  			"",
    42  			fmt.Errorf("%w: %q", ErrInvalidDirectory, dir)
    43  	}
    44  
    45  	if action == "" {
    46  		return "", "", ErrMissingAction
    47  	}
    48  
    49  	return dir, action, nil
    50  }
    51  
    52  // ParseCmds parses cmd strings into arrays of directories and actions.
    53  // Directories are validated while the actions are context sensitive.
    54  // The first entry must contain a relative directory component however
    55  // subsequent entries that do not specify a directory will default to
    56  // the last directory defined.
    57  func parseCmds(cmdStr string) ([]string, []string, error) {
    58  	var (
    59  		lastDir       string
    60  		dir, action   string
    61  		err           error
    62  		dirs, actions []string
    63  	)
    64  
    65  	cmds := regexp.MustCompile(`[\s\t]+`).Split(cmdStr, -1)
    66  
    67  	for i, mi := 0, len(cmds); i < mi && err == nil; i++ {
    68  		cmd := cmds[i]
    69  		if lastDir != "" &&
    70  			strings.LastIndex(cmd, string(os.PathSeparator)) < 0 {
    71  			cmd = "." + string(os.PathSeparator) + filepath.Join(lastDir, cmd)
    72  		}
    73  
    74  		dir, action, err = parseCmd(cmd)
    75  		if err == nil {
    76  			dirs = append(dirs, dir)
    77  			actions = append(actions, action)
    78  			lastDir = dir
    79  		}
    80  	}
    81  
    82  	if err != nil {
    83  		return nil, nil, err
    84  	}
    85  
    86  	return dirs, actions, nil
    87  }