1 #!/bin/bash

2

3 LANGUAGE=en

4 N=50

5 REVERSED=NO

6

7 show_usage()

8 {

9 cat<<USAGE > /dev/stderr

10

11 Usage:

12 $0 [ -l LANG ] [ -r ] [ N ]

13

14 Help to learn N (number) previously marked words from LANG language.

15

16 Options:

17 -r reversed mode (show the note first; the word second)

18

19 By default:

20

21 LANG = $LANGUAGE

22 N = $N

23 REVERSED = $REVERSED

24

25 USAGE

26 }

27

28 if [ "$1" = -l ]

29 then

30 if [ -n "$2" ]

31 then

32 LANGUAGE="$2"

33 shift 2

34 else

35 echo "Error: Please, specify LANGUAGE (en, de, ru,...) after -l or don't use -l switch" > /dev/stderr

36 show_usage

37 exit 1

38 fi

39 fi

40

41 if [ "$1" = -r ]

42 then

43 REVERSED="YES"

44 shift

45 fi

46

47 if [ -n "$1" ]

48 then

49 if echo "$1" | grep -qx '[0-9]\+'

50 then

51 N="$1"

52 else

53 echo "Error: Number of words N should be numeric. " > /dev/stderr

54 echo " Please provide a number or don't specify N at all " > /dev/stderr

55 show_usage

56 exit 1

57 fi

58 fi

59

60 notes_file=~/".new-words/notes-$LANGUAGE".txt

61 if [ -e $notes_file ]

62 then

63 true

64 number="`wc -l $notes_file | awk '{print $1}'`"

65 if [ "$number" -lt "$N" ]

66 then

67 echo "Warning: The notes file for the language is too short. Truncating N to $number" > /dev/stderr

68 N="$number"

69 fi

70 while true

71 do

72 main_script="$$"

73 tail -n $((1+$RANDOM%$N)) $notes_file | head -1 | while read word note

74 do

75 trap "kill -1 $main_script; kill -1 $$" 2

76 if [ "$REVERSED" = "NO" ]

77 then

78 echo $word

79 read < /dev/tty

80 echo $note

81 read < /dev/tty

82 clear

83 else

84 echo $note

85 read < /dev/tty

86 echo $word

87 read < /dev/tty

88 clear

89 fi

90 done

91 done

92 else

93 echo "Error: Uknown language '$LANGUAGE'" > /dev/stderr

94 echo " File $notes_file not found" > /dev/stderr

95 exit 1

96 fi