github.com/alexandrestein/complete@v1.1.2-0.20180313112007-cc6c1c3aa2ce/args.go (about)

     1  package complete
     2  
     3  import (
     4  	"os"
     5  	"path/filepath"
     6  	"strings"
     7  	"unicode"
     8  )
     9  
    10  // Args describes command line arguments
    11  type Args struct {
    12  	// All lists of all arguments in command line (not including the command itself)
    13  	All []string
    14  	// Completed lists of all completed arguments in command line,
    15  	// If the last one is still being typed - no space after it,
    16  	// it won't appear in this list of arguments.
    17  	Completed []string
    18  	// Last argument in command line, the one being typed, if the last
    19  	// character in the command line is a space, this argument will be empty,
    20  	// otherwise this would be the last word.
    21  	Last string
    22  	// LastCompleted is the last argument that was fully typed.
    23  	// If the last character in the command line is space, this would be the
    24  	// last word, otherwise, it would be the word before that.
    25  	LastCompleted string
    26  }
    27  
    28  // Directory gives the directory of the current written
    29  // last argument if it represents a file name being written.
    30  // in case that it is not, we fall back to the current directory.
    31  func (a Args) Directory() string {
    32  	if info, err := os.Stat(a.Last); err == nil && info.IsDir() {
    33  		return fixPathForm(a.Last, a.Last)
    34  	}
    35  	dir := filepath.Dir(a.Last)
    36  	if info, err := os.Stat(dir); err != nil || !info.IsDir() {
    37  		return "./"
    38  	}
    39  	return fixPathForm(a.Last, dir)
    40  }
    41  
    42  func newArgs(line string) Args {
    43  	var (
    44  		all       []string
    45  		completed []string
    46  	)
    47  	parts := splitFields(line)
    48  	if len(parts) > 0 {
    49  		all = parts[1:]
    50  		completed = removeLast(parts[1:])
    51  	}
    52  	return Args{
    53  		All:           all,
    54  		Completed:     completed,
    55  		Last:          last(parts),
    56  		LastCompleted: last(completed),
    57  	}
    58  }
    59  
    60  func splitFields(line string) []string {
    61  	parts := strings.Fields(line)
    62  	if len(line) > 0 && unicode.IsSpace(rune(line[len(line)-1])) {
    63  		parts = append(parts, "")
    64  	}
    65  	parts = splitLastEqual(parts)
    66  	return parts
    67  }
    68  
    69  func splitLastEqual(line []string) []string {
    70  	if len(line) == 0 {
    71  		return line
    72  	}
    73  	parts := strings.Split(line[len(line)-1], "=")
    74  	return append(line[:len(line)-1], parts...)
    75  }
    76  
    77  func (a Args) from(i int) Args {
    78  	if i > len(a.All) {
    79  		i = len(a.All)
    80  	}
    81  	a.All = a.All[i:]
    82  
    83  	if i > len(a.Completed) {
    84  		i = len(a.Completed)
    85  	}
    86  	a.Completed = a.Completed[i:]
    87  	return a
    88  }
    89  
    90  func removeLast(a []string) []string {
    91  	if len(a) > 0 {
    92  		return a[:len(a)-1]
    93  	}
    94  	return a
    95  }
    96  
    97  func last(args []string) string {
    98  	if len(args) == 0 {
    99  		return ""
   100  	}
   101  	return args[len(args)-1]
   102  }