[PATCH JGIT] In the commit dialog, deal with Signed-off-by not on the last line

[Yann Simon <yann.simon.fr@gmail.com>]

The previous implementation made the assumption that
the Signed-off-by is always on the last line.

Correct this assumption and deal with Signed-off-by everywhere in
the commit message.

Signed-off-by: Yann Simon <yann.simon.fr@gmail.com>
---
I hope this send will not be whitespace damaged.

--
yann

 .../egit/ui/internal/dialogs/CommitDialog.java     |   65
++++++++++++--------
 1 files changed, 40 insertions(+), 25 deletions(-)

diff --git
a/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/dialogs/CommitDialog.java
b/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/dialogs/CommitDialog.java
index bbe7193..403d69d 100644
---
a/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/dialogs/CommitDialog.java
+++
b/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/dialogs/CommitDialog.java
@@ -179,14 +179,16 @@ public void keyPressed(KeyEvent arg0) {
         if (committer != null)
             committerText.setText(committer);
         committerText.addModifyListener(new ModifyListener() {
+            String oldCommitter = committerText.getText();
             public void modifyText(ModifyEvent e) {
                 if (signedOffButton.getSelection()) {
                     // the commit message is signed
                     // the signature must be updated
-                    String oldCommitText = commitText.getText();
-                    oldCommitText = removeLastLine(oldCommitText);
-                    oldCommitText = signOff(oldCommitText);
-                    commitText.setText(oldCommitText);
+                    String neuCommitter = committerText.getText();
+                    String oldSignOff = getSignedOff(oldCommitter);
+                    String neuSignOff = getSignedOff(neuCommitter);
+                  
 commitText.setText(replaceSignOff(commitText.getText(), oldSignOff,
neuSignOff));
+                    oldCommitter = neuCommitter;
                 }
             }
         });
@@ -230,12 +232,16 @@ public void widgetDefaultSelected(SelectionEvent
arg0) {
 
         signedOffButton.addSelectionListener(new SelectionListener() {
             public void widgetSelected(SelectionEvent arg0) {
+                String curText = commitText.getText();
                 if (signedOffButton.getSelection()) {
                     // add signed off line
-                    commitText.setText(signOff(commitText.getText()));
+                    commitText.setText(signOff(curText));
                 } else {
                     // remove signed off line
-                  
 commitText.setText(removeLastLine(commitText.getText()));
+                    curText = replaceSignOff(curText, getSignedOff(), "");
+                    if (curText.endsWith(Text.DELIMITER + Text.DELIMITER))
+                        curText = curText.substring(0, curText.length()
- Text.DELIMITER.length());
+                    commitText.setText(curText);
                 }
             }
 
@@ -279,11 +285,19 @@ public void modifyText(ModifyEvent e) {
     }
 
     private void updateSignedOffButton() {
-      
 signedOffButton.setSelection(getLastLine(commitText.getText()).equals(getSignedOff()));
+        String curText = commitText.getText();
+        if (!curText.endsWith(Text.DELIMITER))
+            curText += Text.DELIMITER;
+
+        signedOffButton.setSelection(curText.indexOf(getSignedOff() +
Text.DELIMITER) != -1);
     }
 
     private String getSignedOff() {
-        return Constants.SIGNED_OFF_BY_TAG + committerText.getText();
+        return getSignedOff(committerText.getText());
+    }
+
+    private String getSignedOff(String signer) {
+        return Constants.SIGNED_OFF_BY_TAG + signer;
     }
 
     private String signOff(String input) {
@@ -299,32 +313,33 @@ private String signOff(String input) {
     }
 
     private String getLastLine(String input) {
-        String output = removeLastLineBreak(input);
+        String output = input;
         int breakLength = Text.DELIMITER.length();
 
-        // get the last line
+        // remove last line break if exist
         int lastIndexOfLineBreak = output.lastIndexOf(Text.DELIMITER);
+        if (lastIndexOfLineBreak != -1 && lastIndexOfLineBreak ==
output.length() - breakLength)
+            output = output.substring(0, output.length() - breakLength);
+
+        // get the last line
+        lastIndexOfLineBreak = output.lastIndexOf(Text.DELIMITER);
         return lastIndexOfLineBreak == -1 ? output :
output.substring(lastIndexOfLineBreak + breakLength, output.length());
     }
 
-    private String removeLastLine(String input) {
-        String output = removeLastLineBreak(input);
+    private String replaceSignOff(String input, String oldSignOff,
String newSignOff) {
+        assert input != null;
+        assert oldSignOff != null;
+        assert newSignOff != null;
 
-        // remove the last line if possible
-        int lastIndexOfLineBreak = output.lastIndexOf(Text.DELIMITER);
-        return lastIndexOfLineBreak == -1 ? "" : output.substring(0,
lastIndexOfLineBreak); //$NON-NLS-1$
-    }
-
-    private String removeLastLineBreak(String input) {
-        String output = input;
-        int breakLength = Text.DELIMITER.length();
+        String curText = input;
+        if (!curText.endsWith(Text.DELIMITER))
+            curText += Text.DELIMITER;
 
-        // remove last line break if exist
-        int lastIndexOfLineBreak = output.lastIndexOf(Text.DELIMITER);
-        if (lastIndexOfLineBreak != -1 && lastIndexOfLineBreak ==
output.length() - breakLength)
-            output = output.substring(0, output.length() - breakLength);
+        int indexOfSignOff = curText.indexOf(oldSignOff + Text.DELIMITER);
+        if (indexOfSignOff == -1)
+            return input;
 
-        return output;
+        return input.substring(0, indexOfSignOff) + newSignOff +
input.substring(indexOfSignOff + oldSignOff.length(), input.length());
     }
 
     private Menu getContextMenu() {
-- 
1.6.1.2