public void NoLineMatchesFromNoLines()
{
var chunks = new DiffChunk[0];
var lines = new DiffLine[0];
var line = DiffUtilities.Match(chunks, lines);
Assert.Null(line);
}
IPullRequestSessionManager CreateSessionManager(
string commitSha = "COMMIT",
string relativePath = RelativePath,
IPullRequestSession session = null,
PullRequestTextBufferInfo textBufferInfo = null)
{
var thread = CreateThread(10, "Existing comment");
var diff = new DiffChunk
{
DiffLine = 10,
OldLineNumber = 1,
NewLineNumber = 1,
};
for (var i = 0; i < 10; ++i)
{
diff.Lines.Add(new DiffLine
{
NewLineNumber = i,
DiffLineNumber = i + 10,
Type = i < 5 ? DiffChangeType.Delete : DiffChangeType.Add,
});
}
var file = Substitute.For <IPullRequestSessionFile>();
file.CommitSha.Returns(commitSha);
file.Diff.Returns(new[] { diff });
file.InlineCommentThreads.Returns(new[] { thread });
file.LinesChanged.Returns(new Subject <IReadOnlyList <Tuple <int, DiffSide> > >());
session = session ?? CreateSession();
if (textBufferInfo != null)
{
session.GetFile(textBufferInfo.RelativePath, textBufferInfo.CommitSha).Returns(file);
}
var result = Substitute.For <IPullRequestSessionManager>();
result.CurrentSession.Returns(session);
result.GetLiveFile(relativePath, Arg.Any <ITextView>(), Arg.Any <ITextBuffer>()).Returns(file);
result.GetRelativePath(Arg.Any <ITextBuffer>()).Returns(relativePath);
result.GetTextBufferInfo(Arg.Any <ITextBuffer>()).Returns(textBufferInfo);
return(result);
}
static IPullRequestSessionFile CreateSessionFile()
{
var diffChunk = new DiffChunk
{
Lines =
{
// Line numbers here are 1-based. There is an add diff entry on line 11
// and a delete entry on line 13.
new DiffLine {
Type = DiffChangeType.Add, NewLineNumber = 11 + 1
},
new DiffLine {
Type = DiffChangeType.Delete, OldLineNumber = 13 + 1
},
}
};
var diff = new List <DiffChunk> {
diffChunk
};
var rhsThread = Substitute.For <IInlineCommentThreadModel>();
rhsThread.DiffLineType.Returns(DiffChangeType.Add);
rhsThread.LineNumber.Returns(10);
var lhsThread = Substitute.For <IInlineCommentThreadModel>();
lhsThread.DiffLineType.Returns(DiffChangeType.Delete);
lhsThread.LineNumber.Returns(12);
// We have a comment to display on the right-hand-side of the diff view on line
// 11 and a comment to display on line 13 on the left-hand-side.
var threads = new List <IInlineCommentThreadModel> {
rhsThread, lhsThread
};
var file = Substitute.For <IPullRequestSessionFile>();
file.Diff.Returns(diff);
file.InlineCommentThreads.Returns(threads);
file.LinesChanged.Returns(new Subject <IReadOnlyList <Tuple <int, DiffSide> > >());
return(file);
}
IPullRequestSessionManager CreateSessionManager(string commitSha = "COMMIT")
{
var thread = CreateThread(10, "Existing comment");
var diff = new DiffChunk
{
DiffLine = 10,
OldLineNumber = 1,
NewLineNumber = 1,
};
for (var i = 0; i < 10; ++i)
{
diff.Lines.Add(new DiffLine
{
NewLineNumber = i,
DiffLineNumber = i + 10,
Type = i < 5 ? DiffChangeType.Delete : DiffChangeType.Add,
});
}
var file = Substitute.For <IPullRequestSessionFile>();
file.CommitSha.Returns(commitSha);
file.Diff.Returns(new[] { diff });
file.InlineCommentThreads.Returns(new[] { thread });
file.LinesChanged.Returns(new Subject <IReadOnlyList <Tuple <int, DiffSide> > >());
var session = Substitute.For <IPullRequestSession>();
session.LocalRepository.CloneUrl.Returns(new UriString("https://foo.bar"));
var result = Substitute.For <IPullRequestSessionManager>();
result.CurrentSession.Returns(session);
result.GetLiveFile(RelativePath, Arg.Any <ITextView>(), Arg.Any <ITextBuffer>()).Returns(file);
result.GetRelativePath(Arg.Any <ITextBuffer>()).Returns(RelativePath);
return(result);
}
/// <summary>
/// Get a list of the operations that would make a terminal window look like this snapshot
/// if you assume that beforehand it looked like the older snapshot you pass in.
/// </summary>
/// <param name="older">the older snapshot of a screen to diff from</param>
/// <returns>the string that if output in order, will give you the desired changes</returns>
public string DiffFrom(IScreenSnapShot older)
{
StringBuilder output = new StringBuilder();
int verticalScroll = TopRow - older.TopRow;
int trackCursorColumn = older.CursorColumn; // track the movements that will occur as the outputs happen.
int trackCursorRow = older.CursorRow; // track the movements that will occur as the outputs happen.
// First, output the command to make the terminal scroll to match:
if (verticalScroll > 0) // scrolling text up (eyeballs panning down)
output.Append(new String((char)UnicodeCommand.SCROLLSCREENUPONE, verticalScroll)); // A run of scrollup chars
else if (verticalScroll < 0) // scrolling text down (eyeballs panning up)
output.Append(new String((char)UnicodeCommand.SCROLLSCREENDOWNONE, -verticalScroll)); // A run of scrolldown chars
// Check each row:
for (int newRowNum = 0 ; newRowNum < RowCount ; ++newRowNum)
{
// Account for the diff due to the scrolling:
int oldRowNum = newRowNum + verticalScroll;
IScreenBufferLine newRow = Buffer[newRowNum];
bool oldRowExists = (oldRowNum >= 0 && oldRowNum < older.Buffer.Count);
IScreenBufferLine olderRow = oldRowExists ? older.Buffer[oldRowNum] : new ScreenBufferLine(0);
// if new row is an empty dummy, then pad it out so it gets properly diffed against the old row:
if (newRow.Length == 0)
newRow = new ScreenBufferLine(olderRow.Length);
// If the old row is a dummy pad or if the new row is newer than the old row, then it needs checking for diffs:
if (olderRow.Length == 0 || newRow.LastChangeTick > olderRow.LastChangeTick)
{
List<DiffChunk> diffs = new List<DiffChunk>();
for (int newCol = 0 ; newCol < newRow.Length ; ++newCol)
{
// Check if they differ, but in a way that treats ' ' and 0x00 as identical, and treats a shorter
// old row as if it has been padded with spaces:
bool oldRowTooShort = newCol >= olderRow.Length;
char newChar = (newRow[newCol] == '\0' ? ' ' : newRow[newCol]);
char oldChar = (oldRowTooShort ? ' ' : (olderRow[newCol] == '\0' ? ' ' : olderRow[newCol]));
if (newChar != oldChar)
{
// Start a new diff chunk if there isn't one yet, or the diff is a long enough distance from the existing one:
if (diffs.Count == 0 || diffs[diffs.Count-1].EndCol < newCol - JOIN_DIFF_DIST)
{
DiffChunk newChunk = new DiffChunk
{
StartCol = newCol,
EndCol = newCol
};
diffs.Add(newChunk);
}
else // stretch the existing diff chunk to here.
{
diffs[diffs.Count-1].EndCol = newCol;
}
}
}
string newRowText = newRow.ToString();
foreach (DiffChunk diff in diffs)
{
/* comment-out -----------------
// If we're lucky enough that the current cursor happens to be right where we need it to
// be, some of these are more efficient. Else it does TELEPORTCURSOR's:
// Just one char removed to the left of current cursor pos - do a backspace instead of the ugly work:
if (trackCursorRow == newRowNum && (diff.EndCol == trackCursorColumn - 1 && diff.StartCol == diff.EndCol))
{
output.Append(String.Format("{0}{1}{2}", (char)0x08, newRowText.Substring(diff.StartCol,1), (char)0x08));
trackCursorColumn = diff.EndCol;
trackCursorRow = newRowNum;
}
else
{
--------------------------- */
// If the change starts right where the cursor happens to be (i.e. when typing, one char
// at current cursor position will typically be the only diff from one update to the next),
// then don't bother moving the cursor first, else move it to the new pos:
string moveString;
if (trackCursorRow == newRowNum && diff.StartCol == trackCursorColumn)
moveString = "";
else
moveString = String.Format("{0}{1}{2}",
(char)UnicodeCommand.TELEPORTCURSOR,
(char)diff.StartCol,
(char)newRowNum);
// content = the bit of string to print at this location, with nulls made into spaces so the
// telnet terminal will print correctly.
string content = newRowText.Substring(diff.StartCol, diff.EndCol - diff.StartCol + 1).Replace('\0',' ');
output.Append(String.Format("{0}{1}", moveString, content));
trackCursorColumn = diff.EndCol+1;
trackCursorRow = newRowNum;
/* comment-out -----------------
}
--------------------------- */
}
}
}
// Now set the cursor back to the right spot one more time, unless it's already there:
if (trackCursorRow != CursorRow || trackCursorColumn != CursorColumn)
{
output.Append(String.Format("{0}{1}{2}",
(char)UnicodeCommand.TELEPORTCURSOR,
(char)CursorColumn,
(char)CursorRow));
}
return output.ToString();
}
static IPullRequestSessionFile CreateSessionFile(bool withComments = true, bool withAnnotations = false)
{
var diffChunk = new DiffChunk
{
Lines =
{
// Line numbers here are 1-based. There is an add diff entry on lines 11 and 21
// and a delete entry on line 13.
new DiffLine {
Type = DiffChangeType.Add, NewLineNumber = 11 + 1
},
new DiffLine {
Type = DiffChangeType.Delete, OldLineNumber = 13 + 1
},
new DiffLine {
Type = DiffChangeType.Add, NewLineNumber = 21 + 1
},
}
};
var diff = new List <DiffChunk> {
diffChunk
};
var file = Substitute.For <IPullRequestSessionFile>();
file.Diff.Returns(diff);
if (withComments)
{
var rhsThread = Substitute.For <IInlineCommentThreadModel>();
rhsThread.DiffLineType.Returns(DiffChangeType.Add);
rhsThread.LineNumber.Returns(10);
var lhsThread = Substitute.For <IInlineCommentThreadModel>();
lhsThread.DiffLineType.Returns(DiffChangeType.Delete);
lhsThread.LineNumber.Returns(12);
// We have a comment to display on the right-hand-side of the diff view on line
// 11 and a comment to display on line 13 on the left-hand-side.
var threads = new List <IInlineCommentThreadModel> {
rhsThread, lhsThread
};
file.InlineCommentThreads.Returns(threads);
}
if (withAnnotations)
{
var annotation1 = new InlineAnnotationModel(new CheckSuiteModel(), new CheckRunModel(), new CheckRunAnnotationModel()
{
EndLine = 11
});
var annotation2 = new InlineAnnotationModel(new CheckSuiteModel(), new CheckRunModel(), new CheckRunAnnotationModel()
{
EndLine = 21
});
var annotation3 = new InlineAnnotationModel(new CheckSuiteModel(), new CheckRunModel(), new CheckRunAnnotationModel()
{
EndLine = 21
});
var annotations = new List <InlineAnnotationModel> {
annotation1, annotation2, annotation3
};
file.InlineAnnotations.Returns(annotations);
}
file.LinesChanged.Returns(new Subject <IReadOnlyList <Tuple <int, DiffSide> > >());
return(file);
}
/// <summary>
/// Get a list of the operations that would make a terminal window look like this snapshot
/// if you assume that beforehand it looked like the older snapshot you pass in.
/// </summary>
/// <param name="older">the older snapshot of a screen to diff from</param>
/// <returns>the string that if output in order, will give you the desired changes</returns>
public string DiffFrom(IScreenSnapShot older)
{
StringBuilder output = new StringBuilder();
int verticalScroll = TopRow - older.TopRow;
int trackCursorColumn = older.CursorColumn; // track the movements that will occur as the outputs happen.
int trackCursorRow = older.CursorRow; // track the movements that will occur as the outputs happen.
// First, output the command to make the terminal scroll to match:
if (verticalScroll > 0) // scrolling text up (eyeballs panning down)
{
output.Append(new String((char)UnicodeCommand.SCROLLSCREENUPONE, verticalScroll)); // A run of scrollup chars
}
else if (verticalScroll < 0) // scrolling text down (eyeballs panning up)
{
output.Append(new String((char)UnicodeCommand.SCROLLSCREENDOWNONE, -verticalScroll)); // A run of scrolldown chars
}
// Check each row:
for (int newRowNum = 0; newRowNum < RowCount; ++newRowNum)
{
// Account for the diff due to the scrolling:
int oldRowNum = newRowNum + verticalScroll;
IScreenBufferLine newRow = Buffer[newRowNum];
bool oldRowExists = (oldRowNum >= 0 && oldRowNum < older.Buffer.Count);
IScreenBufferLine olderRow = oldRowExists ? older.Buffer[oldRowNum] : new ScreenBufferLine(0);
// if new row is an empty dummy, then pad it out so it gets properly diffed against the old row:
if (newRow.Length == 0)
{
newRow = new ScreenBufferLine(olderRow.Length);
}
// If the old row is a dummy pad or if the new row is newer than the old row, then it needs checking for diffs:
if (olderRow.Length == 0 || newRow.LastChangeTick > olderRow.LastChangeTick)
{
List <DiffChunk> diffs = new List <DiffChunk>();
for (int newCol = 0; newCol < newRow.Length; ++newCol)
{
// Check if they differ, but in a way that treats ' ' and 0x00 as identical, and treats a shorter
// old row as if it has been padded with spaces:
bool oldRowTooShort = newCol >= olderRow.Length;
char newChar = (newRow[newCol] == '\0' ? ' ' : newRow[newCol]);
char oldChar = (oldRowTooShort ? ' ' : (olderRow[newCol] == '\0' ? ' ' : olderRow[newCol]));
if (newChar != oldChar)
{
// Start a new diff chunk if there isn't one yet, or the diff is a long enough distance from the existing one:
if (diffs.Count == 0 || diffs[diffs.Count - 1].EndCol < newCol - JOIN_DIFF_DIST)
{
DiffChunk newChunk = new DiffChunk
{
StartCol = newCol,
EndCol = newCol
};
diffs.Add(newChunk);
}
else // stretch the existing diff chunk to here.
{
diffs[diffs.Count - 1].EndCol = newCol;
}
}
}
string newRowText = newRow.ToString();
foreach (DiffChunk diff in diffs)
{
/* comment-out -----------------
* // If we're lucky enough that the current cursor happens to be right where we need it to
* // be, some of these are more efficient. Else it does TELEPORTCURSOR's:
*
* // Just one char removed to the left of current cursor pos - do a backspace instead of the ugly work:
* if (trackCursorRow == newRowNum && (diff.EndCol == trackCursorColumn - 1 && diff.StartCol == diff.EndCol))
* {
* output.Append(String.Format("{0}{1}{2}", (char)0x08, newRowText.Substring(diff.StartCol,1), (char)0x08));
* trackCursorColumn = diff.EndCol;
* trackCursorRow = newRowNum;
* }
* else
* {
* --------------------------- */
// If the change starts right where the cursor happens to be (i.e. when typing, one char
// at current cursor position will typically be the only diff from one update to the next),
// then don't bother moving the cursor first, else move it to the new pos:
string moveString;
if (trackCursorRow == newRowNum && diff.StartCol == trackCursorColumn)
{
moveString = "";
}
else
{
moveString = String.Format("{0}{1}{2}",
(char)UnicodeCommand.TELEPORTCURSOR,
(char)diff.StartCol,
(char)newRowNum);
}
// content = the bit of string to print at this location, with nulls made into spaces so the
// telnet terminal will print correctly.
string content = newRowText.Substring(diff.StartCol, diff.EndCol - diff.StartCol + 1).Replace('\0', ' ');
output.Append(String.Format("{0}{1}", moveString, content));
trackCursorColumn = diff.EndCol + 1;
trackCursorRow = newRowNum;
/* comment-out -----------------
* }
* --------------------------- */
}
}
}
// Now set the cursor back to the right spot one more time, unless it's already there:
if (trackCursorRow != CursorRow || trackCursorColumn != CursorColumn)
{
output.Append(String.Format("{0}{1}{2}",
(char)UnicodeCommand.TELEPORTCURSOR,
(char)CursorColumn,
(char)CursorRow));
}
return(output.ToString());
}