radicle-heartwood-lfs/radicle-cli/examples/rad-patch-ahead-behind.md

In this example, we explore how the ahead/behind indicator works, and what is shown as diffs in the case of divergent branches.

First we add the CONTRIBUTORS file to master, which contains one entry:

$ git checkout -q master
$ git add CONTRIBUTORS
$ git commit -a -q -m "Add contributors"
$ git push rad master
$ cat CONTRIBUTORS
Alice Jones

Then we create a feature branch which adds another entry:

$ git checkout -q -b feature/1
$ sed -i '$a Alan K' CONTRIBUTORS
$ git commit -a -q -m "Add Alan"

We go back to master, and add a different second entry, essentially forking the history:

$ git checkout -q master
$ sed -i '$a Jason Bourne' CONTRIBUTORS
$ git commit -a -q -m "Add Jason"
$ git push rad master
$ git log --graph --decorate --abbrev-commit --pretty=oneline --all
* 5c88a79 (feature/1) Add Alan
| * e101a99 (HEAD -> master, rad/master) Add Jason
|/ [..]
* f64fb2c Add contributors
* f2de534 Second commit
* 08c788d Initial commit

Then we create a patch from feature/1:

$ git push rad feature/1:refs/patches
✓ Patch 0d1b997bc21ffa5cb7cda244d94e1d6bfcc4a513 opened
To rad://z42hL2jL4XNk6K8oHQaSWfMgCL7ji/z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi
 * [new reference]   feature/1 -> refs/patches

When listing, we see that it has one addition:

$ rad patch list
╭────────────────────────────────────────────────────────────────────────╮
│ ●  ID       Title     Author                  Head     +   -   Updated │
├────────────────────────────────────────────────────────────────────────┤
│ ●  0d1b997  Add Alan  z6MknSL…StBU8Vi  (you)  5c88a79  +1  -0  now     │
╰────────────────────────────────────────────────────────────────────────╯

When showing the patch, we see that it is ahead 1, behind 1, since master has diverged by one commit:

$ rad patch show -v -p 0d1b997
╭────────────────────────────────────────────────────╮
│ Title     Add Alan                                 │
│ Patch     0d1b997bc21ffa5cb7cda244d94e1d6bfcc4a513 │
│ Author    z6MknSL…StBU8Vi (you)                    │
│ Head      5c88a79d75f5c2b4cc51ee6f163d2db91ee198d7 │
│ Base      f64fb2c8fe28f7c458c72ec8d700373924794943 │
│ Branches  feature/1                                │
│ Commits   ahead 1, behind 1                        │
│ Status    open                                     │
├────────────────────────────────────────────────────┤
│ 5c88a79 Add Alan                                   │
├────────────────────────────────────────────────────┤
│ ● opened by z6MknSL…StBU8Vi (you) (5c88a79) now    │
╰────────────────────────────────────────────────────╯

commit 5c88a79d75f5c2b4cc51ee6f163d2db91ee198d7
Author: radicle <radicle@localhost>
Date:   Thu Dec 15 17:28:04 2022 +0000

    Add Alan

diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 3f60d25..6829c43 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -1 +1,2 @@
 Alice Jones
+Alan K

Then, we stack another change onto feature/1, adding another contributor:

$ git checkout -q -b feature/2 feature/1
$ sed -i '$a Mel Farna' CONTRIBUTORS
$ git commit -a -q -m "Add Mel"
$ git push -o patch.message="Add Mel" rad HEAD:refs/patches
✓ Patch f0064bba0336095123345a1f983edb72242f592c opened
To rad://z42hL2jL4XNk6K8oHQaSWfMgCL7ji/z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi
 * [new reference]   HEAD -> refs/patches

When we look at the patch, we see that it has both commits, because this new patch uses the same base as the previous patch:

$ rad patch show -v f0064bba0336095123345a1f983edb72242f592c
╭────────────────────────────────────────────────────╮
│ Title     Add Mel                                  │
│ Patch     f0064bba0336095123345a1f983edb72242f592c │
│ Author    z6MknSL…StBU8Vi (you)                    │
│ Head      7f63fcbcf23fc39eea784c091ad3d20d7e4bd005 │
│ Base      f64fb2c8fe28f7c458c72ec8d700373924794943 │
│ Branches  feature/2                                │
│ Commits   ahead 2, behind 1                        │
│ Status    open                                     │
├────────────────────────────────────────────────────┤
│ 7f63fcb Add Mel                                    │
│ 5c88a79 Add Alan                                   │
├────────────────────────────────────────────────────┤
│ ● opened by z6MknSL…StBU8Vi (you) (7f63fcb) now    │
╰────────────────────────────────────────────────────╯

If we want to instead create a "stacked" patch, we can do so with the patch.base push option:

$ git push -o patch.message="Add Mel #2" -o patch.base=HEAD^ rad HEAD:refs/patches
✓ Patch 9fbe7185ab3246dec08391f833fffb6c40f0760e opened
To rad://z42hL2jL4XNk6K8oHQaSWfMgCL7ji/z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi
 * [new reference]   HEAD -> refs/patches

As you'll notice, using the previous patch as the base, we only see commit 7f63fcb listed for this new patch.

However, since the patch is still intended to be merged into master, we see that it is still two commits ahead and one behind from master.

$ rad patch show -v 9fbe7185ab3246dec08391f833fffb6c40f0760e
╭────────────────────────────────────────────────────╮
│ Title     Add Mel #2                               │
│ Patch     9fbe7185ab3246dec08391f833fffb6c40f0760e │
│ Author    z6MknSL…StBU8Vi (you)                    │
│ Head      7f63fcbcf23fc39eea784c091ad3d20d7e4bd005 │
│ Base      5c88a79d75f5c2b4cc51ee6f163d2db91ee198d7 │
│ Branches  feature/2                                │
│ Commits   ahead 2, behind 1                        │
│ Status    open                                     │
├────────────────────────────────────────────────────┤
│ 7f63fcb Add Mel                                    │
├────────────────────────────────────────────────────┤
│ ● opened by z6MknSL…StBU8Vi (you) (7f63fcb) now    │
╰────────────────────────────────────────────────────╯