In IntelliJ IDEA, you can trace back all changes in your project. This helps you locate the author of any change, review the differences between file versions or commits, and safely roll back and undo changes if necessary.
Review project history
You can review all changes made to a project sources that match the specified filters. To view project history, open the Log tab of the Version Control window Alt+9. It shows all changes committed to all branches and remote repositories:
In multi-repository projects, the colored stripe on the left indicates which root the selected commit belongs to (each root is marked with its own color). Hover the mouse cursor over the colored stripe to invoke a tip that shows the root path:
Navigate and search through project history
Search through the list of commits by entering full commit names or messages or their fragments, revision numbers, or regular expressions.
Filter the commits by branch or favorite branches, user, date, and folder (or root and folder for multi-root projects).
Click the Go to Hash/Branch/Tag icon on the toolbar or press Ctrl+F and specify a commit hash, tag or the name of a branch you want to jump to (you will be taken to the latest commit in that branch).
Click an arrow to jump to the next commit in a long branch:
Press the Left and Right keys to jump to the parent/child commit. This is especially useful if you have commits to different repositories and multiple branches all mixed in the Log tab of the Version Control window Alt+9.
For more details on the Log tab of the Version Control window Alt+9, see Log Tab.
Review a project's snapshot at a specific revision
IntelliJ IDEA lets you review the state of your project at a selected revision.
Select a commit and choose Browse Repository at Revision from the context menu.
The Repositories tool window will open containing the snapshot of your project at the selected revision.
Review the differences between two commits
IntelliJ IDEA allows you to check which files were modified between two commits instead of having to browse the changes in each commit in between.
Review file history
You can review all changes made to a specific file, and find what exactly was modified in each revision.
Select Git | Show History from the main VCS menu or from the context menu of the selection. The History tab is added to the Version Control window showing the history for the selected file and allowing you to review and compare its revisions.
To identify which changes were introduced in a specific revision, select it in the list. On the right side of the panel the diff is instantly shown.
To view the diff of the whole file in the dedicated diff viewer, select it in the list and press Ctrl+D or click the button on the toolbar. The Differences Viewer will open showing what has changed in this revision.
Review history for directories
In addition to reviewing the history for the whole project or for a specific file, you can check which changes were made in specific folders.
Review the differences between the local and a committed file version
You can check how a committed file revision is different from its local version:
Review how changes were merged
If no conflicts were detected and resolved during the merge, IntelliJ IDEA will display the corresponding message in the Changed Files pane, and will suggest you to review changes originating from both parents:
Select the required file from one of the nodes and click the Show Diff icon on the toolbar or press Ctrl+D. The Differences Viewer will show a two-panel diff allowing you to compare the current version with the selected parent.
If conflicts occurred during the merge, the Changed Files pane will show you a list of files merged with conflicts.
Select the required file and click the Show Diff icon on the toolbar or press Ctrl+D. The Differences Viewer will show a three-panel diff allowing you to compare the current version with each of its parents, and see how exactly conflicts were resolved.
Locate code author (annotate/blame)
You can figure out who introduced which changes to a file by using VCS annotations (corresponds to git-blame). The annotated view shows detailed information for each line of code::
Annotations for lines modified in the current revision, are marked with bold type and an asterisk.
Right-click the gutter in the editor or in the Differences Viewer and select Annotate from the context menu.
Configure the amount of information shown in annotations
You can choose how much information you want to see in the annotations view.
Right-click the annotations gutter, choose View and select which type of information you want to see, including the revision from which this change originated, the date, the name of the author in different formats, and the commit number.
You can also set highlighting under Colors.
Configure annotation options
Right-click the annotations gutter and select Options from the context menu:
Ignore Whitespaces: whitespaces will be ignored (git
blame -w). This means that annotations will point to the previous meaningful commit.
Detect Movements Within File: when a commit moves or copies lines within the same file, such change will be ignored (git
blame -M). This means that annotations will point to the previous meaningful commit.
Detect Movements Across Files: when a commit moves or copies lines from other files that were modified in the same commit, such change will be ignored (git
blame -C). This means that annotations will point to the previous meaningful commit.
Show Commit Timestamp: select this option if you want IntelliJ IDEA to show the commit timestamp in the Annotations view instead of the time when a change was authored.
Customize date format
Click the Date Time Pattern field next to VCS Annotate and specify the date format that you want to use for VCS annotations. See patterns reference.
Annotate a previous revision
IntelliJ IDEA lets you annotate not only the current file revision, but also its previous revisions. The following options are available from the context menu of the annotations gutter:
Annotate Revision: this option is useful if you want to check what a file looked like after a particular change was committed.
Annotate Previous Revision: this option is useful if you find yourself in a situation when the last change in a particular line is meaningless, for example if all that was changed is code formatting. In this case, you can check what the previous revision of the file looked like.
You can also annotate a particular file from the History view. In the History tab, select the file version you want to review, right-click the corresponding line and select Annotate from the context menu.
Watch this video to learn more on how you can benefit from using annotations: