updatemanpages.pl: Update man pages to use current date and versions

Added script to update man pages to use the current date and
curl/libcurl versions.

updatemanpages.pl has three arrays: list of directories to look in,
list of extensions to process, list of files to exclude from
processing.

Check man page in git repoistory using the date from the existing man
page before updating to avoid updating the man page if no change is
made.

If data is received from the git command then update the man page with
the current date and version otherwise leave alone.

Applied patch from badger to make the date argument optional, change the
git command used, added date argument to processfile subroutine and
print to STDERR if no date is found in a man page.

Added code to process the changed man page into a new man page with
.dist added to the filename to keep the original source files unchanged.
Updated POD documentation to reflect that the date argument optional.

Code style is in line with CODE_STYLE.md.

Directories: docs/ docs/libcurl/ docs/libcurl/opts/ tests/
Extensions: .1 .3
Excluded files: mk-ca-bundle.1 template.3

(TODO Section 3.1)

scripts/updatemanpages.pl

@@ -0,0 +1,348 @@
+#!/usr/bin/perl
+#***************************************************************************
+#                                  _   _ ____  _
+#  Project                     ___| | | |  _ \| |
+#                             / __| | | | |_) | |
+#                            | (__| |_| |  _ <| |___
+#                             \___|\___/|_| \_\_____|
+#
+# Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at https://curl.haxx.se/docs/copyright.html.
+#
+# You may opt to use, copy, modify, merge, publish, distribute and/or sell
+# copies of the Software, and permit persons to whom the Software is
+# furnished to do so, under the terms of the COPYING file.
+#
+# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+# KIND, either express or implied.
+#
+###########################################################################
+
+# Update man pages.
+
+use strict;
+use warnings;
+use Tie::File;
+
+# Data from the command line.
+
+my $curlver = $ARGV[0];
+my $curldate = $ARGV[1];
+
+# Directories and extensions.
+
+my @dirlist = ("docs/", "docs/libcurl/", "docs/libcurl/opts/", "tests/");
+my @extlist = (".1", ".3");
+my @excludelist = ("mk-ca-bundle.1", "template.3");
+
+# Subroutines
+
+sub printargs{
+  # Print arguments and exit.
+
+  print "usage: updatemanpages.pl <version> <date>\n";
+  exit;
+}
+
+sub getthline{
+  # Process file looking for .TH section.
+
+  my $filename = shift;
+  my $file_handle;
+  my $file_line;
+
+  # Open the file.
+
+  open($file_handle, $filename);
+
+  # Look for the .TH section, process it into an array,
+  # modify it and write to file.
+
+  tie(my @file_data, 'Tie::File', $filename);
+  foreach my $file_data_line(@file_data) {
+    if($file_data_line =~ /^.TH/) {
+      $file_line = $file_data_line;
+      last;
+    }
+  }
+
+  # Close the file.
+
+  close($file_handle);
+  return $file_line;
+}
+
+sub extractth{
+  # Extract .TH section as an array.
+
+  my $input = shift;
+
+  # Split the line into an array.
+
+  my @tharray;
+  my $inputsize = length($input);
+  my $inputcurrent = "";
+  my $quotemode = 0;
+
+  for(my $inputseek = 0; $inputseek < $inputsize; $inputseek++) {
+
+    if(substr($input, $inputseek, 1) eq " " && $quotemode eq 0) {
+      push(@tharray, $inputcurrent);
+      $inputcurrent = "";
+      next;
+    }
+
+    $inputcurrent = $inputcurrent . substr($input, $inputseek, 1);
+
+    if(substr($input, $inputseek, 1) eq "\"") {
+      if($quotemode eq 0) {
+        $quotemode = 1;
+      }
+      else {
+        $quotemode = 0;
+      }
+    }
+  }
+
+  if($inputcurrent ne "") {
+    push(@tharray, $inputcurrent);
+  }
+
+  return @tharray;
+}
+
+sub getdate{
+  # Get the date from the .TH section.
+
+  my $filename = shift;
+  my $thline;
+  my @tharray;
+  my $date = "";
+
+  $thline = getthline($filename);
+
+  # Return nothing if there is no .TH section found.
+
+  if(!$thline || $thline eq "") {
+    return "";
+  }
+
+  @tharray = extractth($thline);
+
+  # Remove the quotes at the start and end.
+
+  $date = substr($tharray[3], 1, -1);
+  return $date;
+}
+
+sub processth{
+  # Process .TH section.
+
+  my $input = shift;
+  my $date = shift;
+
+  # Split the line into an array.
+
+  my @tharray = extractth($input);
+
+  # Alter the date.
+
+  my $itemdate = "\"";
+  $itemdate .= $date;
+  $itemdate .= "\"";
+  $tharray[3] = $itemdate;
+
+  # Alter the item version.
+
+  my $itemver = $tharray[4];
+  my $itemname = "";
+
+  for(my $itemnameseek = 1;
+    $itemnameseek < length($itemver);
+    $itemnameseek++) {
+    if(substr($itemver, $itemnameseek, 1) eq " " ||
+      substr($itemver, $itemnameseek, 1) eq "\"") {
+      last;
+    }
+    $itemname .= substr($itemver, $itemnameseek, 1);
+  }
+
+  $itemver = "\"";
+  $itemver .= $itemname;
+  $itemver .= " ";
+  $itemver .= $curlver;
+  $itemver .= "\"";
+
+  $tharray[4] = $itemver;
+
+  my $thoutput = "";
+
+  foreach my $thvalue (@tharray) {
+    $thoutput .= $thvalue;
+    $thoutput .= " ";
+  }
+  $thoutput =~ s/\s+$//;
+  $thoutput .= "\n";
+
+  # Return updated string.
+
+  return $thoutput;
+}
+
+sub processfile{
+  # Process file looking for .TH section.
+
+  my $filename = shift;
+  my $date = shift;
+  my $file_handle;
+  my $file_dist_handle;
+  my $filename_dist;
+
+  # Open a handle for the original file and a second file handle
+  # for the dist file.
+
+  $filename_dist = $filename . ".dist";
+
+  open($file_handle, $filename);
+  open($file_dist_handle, ">" . $filename_dist);
+
+  # Look for the .TH section, process it into an array,
+  # modify it and write to file.
+
+  tie(my @file_data, 'Tie::File', $filename);
+  foreach my $file_data_line (@file_data) {
+    if($file_data_line =~ /^.TH/) {
+      my $file_dist_line = processth($file_data_line, $date);
+      print $file_dist_handle $file_dist_line . "\n";
+    }
+    else {
+      print $file_dist_handle $file_data_line . "\n";
+    }
+  }
+
+  # Close the file.
+
+  close($file_handle);
+  close($file_dist_handle);
+}
+
+# Check that $curlver is set, otherwise print arguments and exit.
+
+if(!$curlver) {
+  printargs();
+}
+
+# Look in each directory.
+
+my $dir_handle;
+
+foreach my $dirname (@dirlist) {
+  foreach my $extname (@extlist) {
+    # Go through the directory looking for files ending with
+    # the current extension.
+
+    opendir($dir_handle, $dirname);
+    my @filelist = grep(/.$extname$/i, readdir($dir_handle));
+
+    foreach my $file (@filelist) {
+      # Skip if file is in exclude list.
+
+      if(grep(/^$file$/, @excludelist)) {
+        next;
+      }
+
+      # Load the file and get the date.
+
+      my $filedate;
+
+      # Check if dist version exists and load date from that
+      # file if it does.
+
+      if(-e ($dirname . $file . ".dist")) {
+        $filedate = getdate(($dirname . $file . ".dist"));
+      }
+      else {
+        $filedate = getdate(($dirname . $file));
+      }
+
+      # Skip if value is empty.
+
+      if(!$filedate || $filedate eq "") {
+        next;
+      }
+
+      # Check the man page in the git repository.
+
+      my $repodata = `LC_TIME=C git log -1 --date="format:%B %d, %Y" \\
+                       --since="$filedate" $dirname$file | grep ^Date:`;
+
+      # If there is output then update the man page
+      # with the new date/version.
+
+      # Process the file if there is output.
+
+      if($repodata) {
+        my $thisdate;
+        if(!$curldate) {
+          if($repodata =~ /^Date: +(.*)/) {
+            $thisdate = $1;
+          }
+          else {
+            print STDERR "Warning: " . ($dirname . $file) . ": found no " .
+                           "date\n";
+          }
+        }
+        else {
+          $thisdate = $curldate;
+        }
+        processfile(($dirname . $file), $thisdate);
+        print $dirname . $file . " page updated to $thisdate\n";
+      }
+    }
+    closedir($dir_handle);
+  }
+}
+
+__END__
+
+=pod
+
+=head1 updatemanpages.pl
+
+Updates the man pages with the version number and optional date. If the date
+isn't provided, the last modified date from git is used.
+
+=head2 USAGE
+
+updatemanpages.pl version [date]
+
+=head3 version
+
+Specifies version (required)
+
+=head3 date
+
+Specifies date (optional)
+
+=head2 SETTINGS
+
+=head3 @dirlist
+
+Specifies the list of directories to look for files in.
+
+=head3 @extlist
+
+Specifies the list of files with extensions to process.
+
+=head3 @excludelist
+
+Specifies the list of files to not process.
+
+=head2 NOTES
+
+This script is used during maketgz.
+
+=cut