vcsh: Make status show commits ahead/behind remote

This is work in progress:
* It does not deal with repos without a remote tracking branch
* It does not share any info if run on a single repo
* I should probably factor this out in a new function

github: in response to richih/vcsh#123

diff --git a/vcsh b/vcsh
index 18cd9e542097cbc006e9287e5730b130bc10e2a3..0ec2bba8c9ddc2d830403608d6df3be8fbe9fa42 100755 (executable)
--- a/vcsh
+++ b/vcsh
@@ -314,6 +314,12 @@ status() {
                        echo "$VCSH_REPO_NAME:"
                        GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
                        use
                        echo "$VCSH_REPO_NAME:"
                        GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
                        use

+                       # TODO repos without remote tracking branch error out
+                       remote_tracking_branch=$(git rev-parse --abbrev-ref --symbolic-full-name @{u})
+                       commits_behind=$(git log ..${remote_tracking_branch} --oneline | wc -l)
+                       commits_ahead=$(git log ${remote_tracking_branch}.. --oneline | wc -l)
+                       [ ${commits_behind} -ne 0 ] && echo "Behind $remote_tracking_branch by $commits_behind commits"
+                       [ ${commits_ahead} -ne 0 ] && echo "Ahead of $remote_tracking_branch by $commits_ahead commits"

                        git status --short --untracked-files='no'
                        VCSH_COMMAND_RETURN_CODE=$?
                        echo
                        git status --short --untracked-files='no'
                        VCSH_COMMAND_RETURN_CODE=$?
                        echo