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7
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1 #!/usr/bin/env perl
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2 #
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3 # shtags: create a tags file for perl scripts
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4 #
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5 # Author: Stephen Riehm
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6 # Last Changed: 96/11/27 19:46:06
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7 #
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8 # "@(#) shtags 1.1 by S. Riehm"
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9 #
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10
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11 # obvious... :-)
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12 sub usage
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13 {
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14 print <<_EOUSAGE_ ;
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15 USAGE: $program [-kvwVx] [-t <file>] <files>
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16 -t <file> Name of tags file to create. (default is 'tags')
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17 -s <shell> Name of the shell language in the script
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18 -v Include variable definitions.
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19 (variables mentioned at the start of a line)
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20 -V Print version information.
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21 -w Suppress "duplicate tag" warnings.
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22 -x Explicitly create a new tags file. Normally tags are merged.
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23 <files> List of files to scan for tags.
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24 _EOUSAGE_
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25 exit 0
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26 }
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27
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28 sub version
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29 {
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30 #
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31 # Version information
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32 #
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33 @id = split( ', ', 'scripts/bin/shtags, /usr/local/, LOCAL_SCRIPTS, 1.1, 96/11/27, 19:46:06' );
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34 $id[0] =~ s,.*/,,;
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35 print <<_EOVERS;
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36 $id[0]: $id[3]
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37 Last Modified: @id[4,5]
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38 Component: $id[1]
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39 Release: $id[2]
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40 _EOVERS
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41 exit( 1 );
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42 }
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43
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44 #
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45 # initialisations
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46 #
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47 ($program = $0) =~ s,.*/,,;
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48 require 'getopts.pl';
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49
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50 #
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51 # parse command line
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52 #
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53 &Getopts( "t:s:vVwx" ) || &usage();
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54 $tags_file = $opt_t || 'tags';
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55 $explicit = $opt_x;
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56 $variable_tags = $opt_v;
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57 $allow_warnings = ! $opt_w;
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58 &version if $opt_V;
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59 &usage() unless @ARGV != 0;
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60
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61 # slurp up the existing tags. Some will be replaced, the ones that aren't
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62 # will be re-written exactly as they were read
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63 if( ! $explicit && open( TAGS, "< $tags_file" ) )
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64 {
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65 while( <TAGS> )
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66 {
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67 /^\S+/;
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68 $tags{$&} = $_;
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69 }
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70 close( TAGS );
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71 }
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72
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73 #
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74 # for each line of every file listed on the command line, look for a
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75 # 'sub' definition, or, if variables are wanted aswell, look for a
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76 # variable definition at the start of a line
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77 #
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78 while( <> )
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79 {
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80 &check_shell($_), ( $old_file = $ARGV ) if $ARGV ne $old_file;
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81 next unless $shell;
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82 if( $shell eq "sh" )
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83 {
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84 next unless /^\s*(((\w+)))\s*\(\s*\)/
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85 || ( $variable_tags && /^(((\w+)=))/ );
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86 $match = $3;
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87 }
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88 if( $shell eq "ksh" )
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89 {
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90 # ksh
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91 next unless /^\s*function\s+(((\w+)))/
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92 || ( $variable_tags && /^(((\w+)=))/ );
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93 $match = $3;
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94 }
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95 if( $shell eq "perl" )
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96 {
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97 # perl
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98 next unless /^\s*sub\s+(\w+('|::))?(\w+)/
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99 || /^\s*(((\w+))):/
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100 || ( $variable_tags && /^(([(\s]*[\$\@\%]{1}(\w+).*=))/ );
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101 $match = $3;
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102 }
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103 if( $shell eq "tcl" )
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104 {
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105 next unless /^\s*proc\s+(((\S+)))/
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106 || ( $variable_tags && /^\s*set\s+(((\w+)\s))/ );
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107 $match = $3;
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108 }
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109 chop;
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110 warn "$match - duplicate ignored\n"
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111 if ( $new{$match}++
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112 || !( $tags{$match} = sprintf( "%s\t%s\t?^%s\$?\n", $match, $ARGV, $_ ) ) )
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113 && $allow_warnings;
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114 }
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115
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116 # write the new tags to the tags file - note that the whole file is rewritten
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117 open( TAGS, "> $tags_file" );
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118 foreach( sort( keys %tags ) )
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119 {
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120 print TAGS "$tags{$_}";
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121 }
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122 close( TAGS );
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123
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124 sub check_shell
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125 {
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126 local( $_ ) = @_;
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127 # read the first line of a script, and work out which shell it is,
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128 # unless a shell was specified on the command line
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129 #
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130 # This routine can't handle clever scripts which start sh and then
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131 # use sh to start the shell they really wanted.
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132 if( $opt_s )
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133 {
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134 $shell = $opt_s;
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135 }
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136 else
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137 {
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138 $shell = "sh" if /^:$/ || /^#!.*\/bin\/sh/;
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139 $shell = "ksh" if /^#!.*\/ksh/;
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140 $shell = "perl" if /^#!.*\/perl/;
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141 $shell = "tcl" if /^#!.*\/wish/;
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142 printf "Using $shell for $ARGV\n";
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143 }
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144 }
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