demos: add demo of the operation log

README.md

@@ -65,6 +65,13 @@ Features:
    an earlier repo state, or to simply undo a particular operation (which does
    not necessarily have to be the most recent operation).
 
+   <details>
+   <summary>Demo</summary>
+   <a href="https://asciinema.org/a/JOYU6vHMAOS3zr4mfMIrA30CX" target="_blank">
+   <img src="https://asciinema.org/a/JOYU6vHMAOS3zr4mfMIrA30CX.svg" />
+   </a>
+   </details>
+
  * **Conflicts can be recorded in commits**
 
    If an operation results in conflicts, information about those conflicts will

demos/demo_operation_log.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+set -euo pipefail
+. "$(dirname "$0")"/demo_helpers.sh
+parse_args "$@"
+
+new_tmp_dir
+jj git clone https://github.com/octocat/Hello-World
+cd Hello-World
+
+run_demo 'The entire repo is under version control' '
+run_command "# We are in the octocat/Hello-World repo."
+run_command "# The \"operation log\" shows the operations so far:"
+run_command "jj op log"
+sleep 7
+run_command "# We are going to make some changes so we can see how the operation log works."
+run_command "# We are currently working off of the \"master\" branch:"
+run_command "jj log"
+sleep 5
+run_command "# Let'\''s add a file, set a description, and rebase onto the \"test\" branch:"
+run_command "echo stuff > new-file"
+sleep 2
+run_command "jj describe -m stuff"
+sleep 2
+run_command "jj rebase -d test"
+sleep 2
+run_command "# We are now going to make another change off of master:"
+run_command "jj co master"
+sleep 1
+run_command "jj describe -m \"other stuff\""
+sleep 2
+run_command "# The repo now looks like this:"
+run_command "jj log"
+sleep 5
+run_command "# And the operation log looks like this:"
+send -h "jj op log\r"
+# Capture the third latest operation id (skipping color codes around it)
+expect -re "o ..34m(.*?)..0m "
+expect -re "o ..34m(.*?)..0m "
+set rebase_op $expect_out(1,string)
+expect_prompt
+sleep 7
+run_command "# Let'\''s undo that rebase operation:"
+run_command "jj undo -o $rebase_op"
+sleep 3
+run_command "# The \"stuff\" change is now back on master as expected:"
+run_command "jj log"
+sleep 5
+run_command "# We can also see what the repo looked like after the rebase operation:"
+run_command "jj --at-op $rebase_op log"
+sleep 5
+run_command "# Looks nice, let'\''s go back to that point:"
+run_command "jj op restore -o $rebase_op"
+sleep 2
+run_command "# We'\''re now back to before the \"other stuff\" change existed:"
+run_command "jj log"
+'