Resolve multiple issues for 1.4

-   Resolve ldiff output issues: Resolves #5 and #6 by adding system-output
    comparison calls to `bin/ldiff` compared against some pre-generated output.
    There is some timestamp manipulation involved with the output comparison,
    as the timestamps are unstable because of the way that git clone works.

-   Resolved a problem with bin/ldiff --context output.

-   Resolved a Numeric/Integer OptParse issue: later versions of Ruby had
    problems working with an `OptParse` option specification of `Numeric`; this
    has been changed to `Integer`.

2 files changed, 14 insertions, 8 deletions

diff --git a/lib/diff/lcs/hunk.rb b/lib/diff/lcs/hunk.rb
index 58a68db..4ec5123 100644
--- a/lib/diff/lcs/hunk.rb
+++ b/lib/diff/lcs/hunk.rb
@@ -20,6 +20,7 @@ class Diff::LCS::Hunk
     before = after = file_length_difference
     after += @blocks[0].diff_size
     @file_length_difference = after # The caller must get this manually
+    @max_diff_size = @blocks.lazy.map { |e| e.diff_size }.max
 
     # Save the start & end of each array. If the array doesn't exist (e.g.,
     # we're only adding items in this block), then figure out the line
@@ -70,6 +71,8 @@ class Diff::LCS::Hunk
         context
       end
 
+    add_end = @max_diff_size if add_end > @max_diff_size
+
     @end_old += add_end
     @end_new += add_end
   end
@@ -190,7 +193,7 @@ class Diff::LCS::Hunk
 
       removes.each do |block|
         block.remove.each do |item|
-          outlist[item.position - lo][0, 1] = encode(block.op) # - or !
+          outlist[item.position - lo].insert(0, encode(block.op)) # - or !
         end
       end
       s << outlist.join("\n")
@@ -203,7 +206,7 @@ class Diff::LCS::Hunk
       outlist = @data_new[lo..hi].collect { |e| e.insert(0, encode(' ')) }
       inserts.each do |block|
         block.insert.each do |item|
-          outlist[item.position - lo][0, 1] = encode(block.op) # + or !
+          outlist[item.position - lo].insert(0, encode(block.op)) # - or !
         end
       end
       s << outlist.join("\n")
diff --git a/lib/diff/lcs/ldiff.rb b/lib/diff/lcs/ldiff.rb
index d385f72..2862267 100644
--- a/lib/diff/lcs/ldiff.rb
+++ b/lib/diff/lcs/ldiff.rb
@@ -30,14 +30,14 @@ class << Diff::LCS::Ldiff
       o.banner = "Usage: #{File.basename($0)} [options] oldfile newfile"
       o.separator ''
       o.on(
-        '-c', '-C', '--context [LINES]', Numeric,
+        '-c', '-C', '--context [LINES]', Integer,
         'Displays a context diff with LINES lines', 'of context. Default 3 lines.'
       ) do |ctx|
         @format = :context
         @lines  = ctx || 3
       end
       o.on(
-        '-u', '-U', '--unified [LINES]', Numeric,
+        '-u', '-U', '--unified [LINES]', Integer,
         'Displays a unified diff with LINES lines', 'of context. Default 3 lines.'
       ) do |ctx|
         @format = :unified
@@ -134,9 +134,9 @@ class << Diff::LCS::Ldiff
     end
 
     if (@format == :unified) or (@format == :context)
-      ft = File.stat(file_old).mtime.localtime.strftime('%Y-%m-%d %H:%M:%S.%N %z')
+      ft = File.stat(file_old).mtime.localtime.strftime('%Y-%m-%d %H:%M:%S.000000000 %z')
       output << "#{char_old} #{file_old}\t#{ft}\n"
-      ft = File.stat(file_new).mtime.localtime.strftime('%Y-%m-%d %H:%M:%S.%N %z')
+      ft = File.stat(file_new).mtime.localtime.strftime('%Y-%m-%d %H:%M:%S.000000000 %z')
       output << "#{char_new} #{file_new}\t#{ft}\n"
     end
 
@@ -155,7 +155,7 @@ class << Diff::LCS::Ldiff
         file_length_difference = hunk.file_length_difference
 
         next unless oldhunk
-        next if @lines.postive? and hunk.merge(oldhunk)
+        next if @lines.positive? and hunk.merge(oldhunk)
 
         output << oldhunk.diff(@format) << "\n"
       ensure
@@ -163,7 +163,10 @@ class << Diff::LCS::Ldiff
       end
     end
 
-    output << oldhunk.diff(@format) << "\n"
+    last = oldhunk.diff(@format)
+    last << "\n" if last.respond_to?(:end_with?) && !last.end_with?("\n")
+
+    output << last
 
     output.reverse_each { |e| real_output << e.diff(:ed_finish) } if @format == :ed