From dade156859ef17005b51b1c5f4e720fc993ed7a9 Mon Sep 17 00:00:00 2001
From: Benjamin Tan <benjamin@dev.ofcr.se>
Date: Thu, 2 May 2024 16:29:31 +0800
Subject: [PATCH] cli: add `jj operation show` command

---
 CHANGELOG.md                       |   3 +
 cli/src/commands/operation/mod.rs  |   4 +
 cli/src/commands/operation/show.rs |  96 +++++++
 cli/tests/cli-reference@.md.snap   |  35 +++
 cli/tests/test_operations.rs       | 392 +++++++++++++++++++++++++++++
 5 files changed, 530 insertions(+)
 create mode 100644 cli/src/commands/operation/show.rs

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f640a98ecf..d486b746ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -70,6 +70,9 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 * New command `jj operation diff` that can compare changes made between two
   operations.
 
+* New command `jj operation show` that can show the changes made in a single
+  operation.
+
 ### Fixed bugs
 
 * `jj diff --git` no longer shows the contents of binary files.
diff --git a/cli/src/commands/operation/mod.rs b/cli/src/commands/operation/mod.rs
index 8b45df520e..aef1925c7f 100644
--- a/cli/src/commands/operation/mod.rs
+++ b/cli/src/commands/operation/mod.rs
@@ -16,6 +16,7 @@ mod abandon;
 mod diff;
 mod log;
 mod restore;
+mod show;
 pub mod undo;
 
 use abandon::{cmd_op_abandon, OperationAbandonArgs};
@@ -23,6 +24,7 @@ use clap::Subcommand;
 use diff::{cmd_op_diff, OperationDiffArgs};
 use log::{cmd_op_log, OperationLogArgs};
 use restore::{cmd_op_restore, OperationRestoreArgs};
+use show::{cmd_op_show, OperationShowArgs};
 use undo::{cmd_op_undo, OperationUndoArgs};
 
 use crate::cli_util::CommandHelper;
@@ -39,6 +41,7 @@ pub enum OperationCommand {
     Diff(OperationDiffArgs),
     Log(OperationLogArgs),
     Restore(OperationRestoreArgs),
+    Show(OperationShowArgs),
     Undo(OperationUndoArgs),
 }
 
@@ -52,6 +55,7 @@ pub fn cmd_operation(
         OperationCommand::Diff(args) => cmd_op_diff(ui, command, args),
         OperationCommand::Log(args) => cmd_op_log(ui, command, args),
         OperationCommand::Restore(args) => cmd_op_restore(ui, command, args),
+        OperationCommand::Show(args) => cmd_op_show(ui, command, args),
         OperationCommand::Undo(args) => cmd_op_undo(ui, command, args),
     }
 }
diff --git a/cli/src/commands/operation/show.rs b/cli/src/commands/operation/show.rs
new file mode 100644
index 0000000000..1546d1b53b
--- /dev/null
+++ b/cli/src/commands/operation/show.rs
@@ -0,0 +1,96 @@
+// Copyright 2024 The Jujutsu Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use itertools::Itertools;
+
+use super::diff::show_op_diff;
+use crate::cli_util::{CommandHelper, LogContentFormat};
+use crate::command_error::{user_error, CommandError};
+use crate::diff_util::DiffFormatArgs;
+use crate::operation_templater::OperationTemplateLanguage;
+use crate::ui::Ui;
+
+/// Show changes to the repository in an operation
+#[derive(clap::Args, Clone, Debug)]
+pub struct OperationShowArgs {
+    /// Show repository changes in this operation, compared to its parent(s)
+    #[arg(visible_alias = "op", default_value = "@")]
+    operation: String,
+    /// Don't show the graph, show a flat list of modified changes
+    #[arg(long)]
+    no_graph: bool,
+    /// Show patch of modifications to changes
+    ///
+    /// If the previous version has different parents, it will be temporarily
+    /// rebased to the parents of the new version, so the diff is not
+    /// contaminated by unrelated changes.
+    #[arg(long, short = 'p')]
+    patch: bool,
+    #[command(flatten)]
+    diff_format: DiffFormatArgs,
+}
+
+pub fn cmd_op_show(
+    ui: &mut Ui,
+    command: &CommandHelper,
+    args: &OperationShowArgs,
+) -> Result<(), CommandError> {
+    let workspace_command = command.workspace_helper(ui)?;
+    let repo = workspace_command.repo();
+    let current_op_id = repo.operation().id();
+    let repo_loader = &repo.loader();
+    let op = workspace_command.resolve_single_op(&args.operation)?;
+    let parents: Vec<_> = op.parents().try_collect()?;
+    if parents.is_empty() {
+        return Err(user_error("Cannot show the root operation"));
+    }
+    let parent_op = repo_loader.merge_operations(command.settings(), parents, None)?;
+    let parent_repo = repo_loader.load_at(&parent_op)?;
+    let repo = repo_loader.load_at(&op)?;
+
+    let workspace_command = command.for_loaded_repo(ui, command.load_workspace()?, repo.clone())?;
+    let commit_summary_template = workspace_command.commit_summary_template();
+
+    let with_content_format = LogContentFormat::new(ui, command.settings())?;
+    let diff_renderer = workspace_command.diff_renderer_for_log(&args.diff_format, args.patch)?;
+
+    // TODO: Should we make this customizable via clap arg?
+    let template;
+    {
+        let language = OperationTemplateLanguage::new(
+            repo_loader.op_store().root_operation_id(),
+            Some(current_op_id),
+            command.operation_template_extensions(),
+        );
+        let text = command.settings().config().get_string("templates.op_log")?;
+        template = workspace_command
+            .parse_template(&language, &text, OperationTemplateLanguage::wrap_operation)?
+            .labeled("op_log");
+    }
+
+    ui.request_pager();
+    template.format(&op, ui.stdout_formatter().as_mut())?;
+
+    show_op_diff(
+        ui,
+        command,
+        repo.as_ref(),
+        &parent_repo,
+        &repo,
+        &commit_summary_template,
+        !args.no_graph,
+        &with_content_format,
+        diff_renderer,
+    )
+}
diff --git a/cli/tests/cli-reference@.md.snap b/cli/tests/cli-reference@.md.snap
index ac3cfae54f..cef02c2fcb 100644
--- a/cli/tests/cli-reference@.md.snap
+++ b/cli/tests/cli-reference@.md.snap
@@ -64,6 +64,7 @@ This document contains the help content for the `jj` command-line program.
 * [`jj operation diff`↴](#jj-operation-diff)
 * [`jj operation log`↴](#jj-operation-log)
 * [`jj operation restore`↴](#jj-operation-restore)
+* [`jj operation show`↴](#jj-operation-show)
 * [`jj operation undo`↴](#jj-operation-undo)
 * [`jj parallelize`↴](#jj-parallelize)
 * [`jj prev`↴](#jj-prev)
@@ -1242,6 +1243,7 @@ For information about the operation log, see https://github.com/martinvonz/jj/bl
 * `diff` — Compare changes to the repository between two operations
 * `log` — Show the operation log
 * `restore` — Create a new operation that restores the repo to an earlier state
+* `show` — Show changes to the repository in an operation
 * `undo` — Create a new operation that undoes an earlier operation
 
 
@@ -1341,6 +1343,39 @@ This restores the repo to the state at the specified operation, effectively undo
 
 
 
+## `jj operation show`
+
+Show changes to the repository in an operation
+
+**Usage:** `jj operation show [OPTIONS] [OPERATION]`
+
+###### **Arguments:**
+
+* `<OPERATION>` — Show repository changes in this operation, compared to its parent(s)
+
+  Default value: `@`
+
+###### **Options:**
+
+* `--no-graph` — Don't show the graph, show a flat list of modified changes
+* `-p`, `--patch` — Show patch of modifications to changes
+
+   If the previous version has different parents, it will be temporarily rebased to the parents of the new version, so the diff is not contaminated by unrelated changes.
+* `-s`, `--summary` — For each path, show only whether it was modified, added, or deleted
+* `--stat` — Show a histogram of the changes
+* `--types` — For each path, show only its type before and after
+
+   The diff is shown as two letters. The first letter indicates the type before and the second letter indicates the type after. '-' indicates that the path was not present, 'F' represents a regular file, `L' represents a symlink, 'C' represents a conflict, and 'G' represents a Git submodule.
+* `--name-only` — For each path, show only its path
+
+   Typically useful for shell commands like: `jj diff -r @- --name_only | xargs perl -pi -e's/OLD/NEW/g`
+* `--git` — Show a Git-format diff
+* `--color-words` — Show a word-level diff with changes indicated only by color
+* `--tool <TOOL>` — Generate diff by external command
+* `--context <CONTEXT>` — Number of lines of context to show
+
+
+
 ## `jj operation undo`
 
 Create a new operation that undoes an earlier operation
diff --git a/cli/tests/test_operations.rs b/cli/tests/test_operations.rs
index 632c2c14e5..86d1fbf27b 100644
--- a/cli/tests/test_operations.rs
+++ b/cli/tests/test_operations.rs
@@ -1002,6 +1002,398 @@ fn test_op_diff_patch() {
     "###);
 }
 
+#[test]
+fn test_op_show() {
+    let test_env = TestEnvironment::default();
+    let git_repo_path = test_env.env_root().join("git-repo");
+    let git_repo = init_bare_git_repo(&git_repo_path);
+    test_env.jj_cmd_ok(test_env.env_root(), &["git", "clone", "git-repo", "repo"]);
+    let repo_path = test_env.env_root().join("repo");
+
+    // Overview of op log.
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "log"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    @  984d5ceb039f test-username@host.example.com 2001-02-03 04:05:07.000 +07:00 - 2001-02-03 04:05:07.000 +07:00
+    │  check out git remote's default branch
+    │  args: jj git clone git-repo repo
+    ○  817baaeefcbb test-username@host.example.com 2001-02-03 04:05:07.000 +07:00 - 2001-02-03 04:05:07.000 +07:00
+    │  fetch from git remote into empty repo
+    │  args: jj git clone git-repo repo
+    ○  b51416386f26 test-username@host.example.com 2001-02-03 04:05:07.000 +07:00 - 2001-02-03 04:05:07.000 +07:00
+    │  add workspace 'default'
+    ○  9a7d829846af test-username@host.example.com 2001-02-03 04:05:07.000 +07:00 - 2001-02-03 04:05:07.000 +07:00
+    │  initialize repo
+    ○  000000000000 root()
+    "###);
+
+    // The root operation is empty.
+    let stderr = test_env.jj_cmd_failure(&repo_path, &["op", "show", "0000000"]);
+    insta::assert_snapshot!(&stderr, @r###"
+    Error: Cannot show the root operation
+    "###);
+
+    // Showing the latest operation.
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show", "@"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    984d5ceb039f test-username@host.example.com 2001-02-03 04:05:07.000 +07:00 - 2001-02-03 04:05:07.000 +07:00
+    check out git remote's default branch
+    args: jj git clone git-repo repo
+
+    Changed commits:
+    ○  Change sqpuoqvxutmz
+       + sqpuoqvx 9708515f (empty) (no description set)
+    ○  Change qpvuntsmwlqt
+       - qpvuntsm hidden 230dd059 (empty) (no description set)
+
+    Changed local branches:
+    branch-1:
+    + ulyvmwyz 1d843d1f branch-1 | Commit 1
+    - (absent)
+
+    Changed remote branches:
+    branch-1@origin:
+    + tracked ulyvmwyz 1d843d1f branch-1 | Commit 1
+    - untracked ulyvmwyz 1d843d1f branch-1 | Commit 1
+    "###);
+    // `jj op show @` should behave identically to `jj op show`.
+    let stdout_without_op_id = test_env.jj_cmd_success(&repo_path, &["op", "show"]);
+    assert_eq!(stdout, stdout_without_op_id);
+
+    // Showing a given operation.
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show", "@-"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    817baaeefcbb test-username@host.example.com 2001-02-03 04:05:07.000 +07:00 - 2001-02-03 04:05:07.000 +07:00
+    fetch from git remote into empty repo
+    args: jj git clone git-repo repo
+
+    Changed commits:
+    ○  Change tqyxmsztkvot
+       + tqyxmszt 3e785984 branch-3@origin | Commit 3
+    ○  Change yuvsmzqkmpws
+       + yuvsmzqk 3d9189bc branch-2@origin | Commit 2
+    ○  Change ulyvmwyzwuwt
+       + ulyvmwyz 1d843d1f branch-1@origin | Commit 1
+
+    Changed remote branches:
+    branch-1@origin:
+    + untracked ulyvmwyz 1d843d1f branch-1@origin | Commit 1
+    - untracked (absent)
+    branch-2@origin:
+    + untracked yuvsmzqk 3d9189bc branch-2@origin | Commit 2
+    - untracked (absent)
+    branch-3@origin:
+    + untracked tqyxmszt 3e785984 branch-3@origin | Commit 3
+    - untracked (absent)
+    "###);
+
+    // Create a conflicted branch using a concurrent operation.
+    test_env.jj_cmd_ok(
+        &repo_path,
+        &[
+            "branch",
+            "set",
+            "branch-1",
+            "-r",
+            "branch-2@origin",
+            "--at-op",
+            "@-",
+        ],
+    );
+    let (_, stderr) = test_env.jj_cmd_ok(&repo_path, &["log"]);
+    insta::assert_snapshot!(&stderr, @r###"
+    Concurrent modification detected, resolving automatically.
+    "###);
+    // Showing a merge operation is empty.
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    6c131cd79314 test-username@host.example.com 2001-02-03 04:05:14.000 +07:00 - 2001-02-03 04:05:14.000 +07:00
+    resolve concurrent operations
+    args: jj log
+    "###);
+
+    // Test fetching from git remote.
+    modify_git_repo(git_repo);
+    let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["git", "fetch"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    "###);
+    insta::assert_snapshot!(&stderr, @r###"
+    branch: branch-1@origin [updated] tracked
+    branch: branch-2@origin [updated] untracked
+    branch: branch-3@origin [deleted] untracked
+    Abandoned 1 commits that are no longer reachable.
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    84466f397d80 test-username@host.example.com 2001-02-03 04:05:16.000 +07:00 - 2001-02-03 04:05:16.000 +07:00
+    fetch from git remote(s) origin
+    args: jj git fetch
+
+    Changed commits:
+    ○  Change qzxslznxxpoz
+       + qzxslznx d487febd branch-2@origin | Commit 5
+    ○  Change slvtnnzxztqy
+       + slvtnnzx 4f856199 branch-1?? branch-1@origin | Commit 4
+    ○  Change tqyxmsztkvot
+       - tqyxmszt hidden 3e785984 Commit 3
+
+    Changed local branches:
+    branch-1:
+    + (added) slvtnnzx 4f856199 branch-1?? branch-1@origin | Commit 4
+    + (added) yuvsmzqk 3d9189bc branch-1?? | Commit 2
+    - (added) ulyvmwyz 1d843d1f Commit 1
+    - (added) yuvsmzqk 3d9189bc branch-1?? | Commit 2
+
+    Changed remote branches:
+    branch-1@origin:
+    + tracked slvtnnzx 4f856199 branch-1?? branch-1@origin | Commit 4
+    - tracked ulyvmwyz 1d843d1f Commit 1
+    branch-2@origin:
+    + untracked qzxslznx d487febd branch-2@origin | Commit 5
+    - untracked yuvsmzqk 3d9189bc branch-1?? | Commit 2
+    branch-3@origin:
+    + untracked (absent)
+    - untracked tqyxmszt hidden 3e785984 Commit 3
+    "###);
+
+    // Test creation of branch.
+    let (stdout, stderr) = test_env.jj_cmd_ok(
+        &repo_path,
+        &["branch", "create", "branch-2", "-r", "branch-2@origin"],
+    );
+    insta::assert_snapshot!(&stdout, @r###"
+    "###);
+    insta::assert_snapshot!(&stderr, @r###"
+    Created 1 branches pointing to qzxslznx d487febd branch-2 branch-2@origin | Commit 5
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    eea894b7c72f test-username@host.example.com 2001-02-03 04:05:18.000 +07:00 - 2001-02-03 04:05:18.000 +07:00
+    create branch branch-2 pointing to commit d487febd08e690ee775a4e0387e30d544307e409
+    args: jj branch create branch-2 -r branch-2@origin
+
+    Changed local branches:
+    branch-2:
+    + qzxslznx d487febd branch-2 branch-2@origin | Commit 5
+    - (absent)
+    "###);
+
+    // Test tracking of branch.
+    let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["branch", "track", "branch-2@origin"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    "###);
+    insta::assert_snapshot!(&stderr, @r###"
+    Started tracking 1 remote branches.
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    d2d43732186a test-username@host.example.com 2001-02-03 04:05:20.000 +07:00 - 2001-02-03 04:05:20.000 +07:00
+    track remote branch branch-2@origin
+    args: jj branch track branch-2@origin
+
+    Changed remote branches:
+    branch-2@origin:
+    + tracked qzxslznx d487febd branch-2 | Commit 5
+    - untracked qzxslznx d487febd branch-2 | Commit 5
+    "###);
+
+    // Test creation of new commit.
+    let (stdout, stderr) =
+        test_env.jj_cmd_ok(&repo_path, &["new", "branch-1@origin", "-m", "new commit"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    "###);
+    insta::assert_snapshot!(&stderr, @r###"
+    Working copy now at: nkmrtpmo 71fe694d (empty) new commit
+    Parent commit      : slvtnnzx 4f856199 branch-1?? branch-1@origin | Commit 4
+    Added 1 files, modified 0 files, removed 1 files
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    f85f06d144b6 test-username@host.example.com 2001-02-03 04:05:22.000 +07:00 - 2001-02-03 04:05:22.000 +07:00
+    new empty commit
+    args: jj new branch-1@origin -m 'new commit'
+
+    Changed commits:
+    ○  Change nkmrtpmomlro
+       + nkmrtpmo 71fe694d (empty) new commit
+    ○  Change sqpuoqvxutmz
+       - sqpuoqvx hidden 9708515f (empty) (no description set)
+    "###);
+
+    // Test updating of local branch.
+    let (stdout, stderr) =
+        test_env.jj_cmd_ok(&repo_path, &["branch", "set", "branch-1", "-r", "@"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    "###);
+    insta::assert_snapshot!(&stderr, @r###"
+    Moved 1 branches to nkmrtpmo 71fe694d branch-1* | (empty) new commit
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    b55c8d9fdc63 test-username@host.example.com 2001-02-03 04:05:24.000 +07:00 - 2001-02-03 04:05:24.000 +07:00
+    point branch branch-1 to commit 71fe694da7811a184f404fffe35cd62b0adb3d89
+    args: jj branch set branch-1 -r @
+
+    Changed local branches:
+    branch-1:
+    + nkmrtpmo 71fe694d branch-1* | (empty) new commit
+    - (added) slvtnnzx 4f856199 branch-1@origin | Commit 4
+    - (added) yuvsmzqk 3d9189bc Commit 2
+    "###);
+
+    // Test deletion of local branch.
+    let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["branch", "delete", "branch-2"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    "###);
+    insta::assert_snapshot!(&stderr, @r###"
+    Deleted 1 branches.
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    25dbc902dbf0 test-username@host.example.com 2001-02-03 04:05:26.000 +07:00 - 2001-02-03 04:05:26.000 +07:00
+    delete branch branch-2
+    args: jj branch delete branch-2
+
+    Changed local branches:
+    branch-2:
+    + (absent)
+    - qzxslznx d487febd branch-2@origin | Commit 5
+    "###);
+
+    // Test pushing to Git remote.
+    let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["git", "push", "--tracked"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    "###);
+    insta::assert_snapshot!(&stderr, @r###"
+    Branch changes to push to origin:
+      Move forward branch branch-1 from 4f856199edbf to 71fe694da781
+      Delete branch branch-2 from d487febd08e6
+    Warning: The working-copy commit in workspace 'default' became immutable, so a new commit has been created on top of it.
+    Working copy now at: wvuyspvk 6136f89a (empty) (no description set)
+    Parent commit      : nkmrtpmo 71fe694d branch-1 | (empty) new commit
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    d8d2184e1621 test-username@host.example.com 2001-02-03 04:05:28.000 +07:00 - 2001-02-03 04:05:28.000 +07:00
+    push all tracked branches to git remote origin
+    args: jj git push --tracked
+
+    Changed commits:
+    ○  Change wvuyspvkupzz
+       + wvuyspvk 6136f89a (empty) (no description set)
+
+    Changed remote branches:
+    branch-1@origin:
+    + tracked nkmrtpmo 71fe694d branch-1 | (empty) new commit
+    - tracked slvtnnzx 4f856199 Commit 4
+    branch-2@origin:
+    + untracked (absent)
+    - tracked qzxslznx d487febd Commit 5
+    "###);
+}
+
+#[test]
+fn test_op_show_patch() {
+    let test_env = TestEnvironment::default();
+    test_env.jj_cmd_ok(test_env.env_root(), &["git", "init", "repo"]);
+    let repo_path = test_env.env_root().join("repo");
+
+    // Update working copy with a single file and create new commit.
+    std::fs::write(repo_path.join("file"), "a\n").unwrap();
+    let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["new"]);
+    insta::assert_snapshot!(&stdout, @"");
+    insta::assert_snapshot!(&stderr, @r###"
+    Working copy now at: rlvkpnrz 56950632 (empty) (no description set)
+    Parent commit      : qpvuntsm 6b1027d2 (no description set)
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show", "@-", "-p", "--git"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    6188e9d1f7da test-username@host.example.com 2001-02-03 04:05:08.000 +07:00 - 2001-02-03 04:05:08.000 +07:00
+    snapshot working copy
+    args: jj new
+
+    Changed commits:
+    ○  Change qpvuntsmwlqt
+       + qpvuntsm 6b1027d2 (no description set)
+       - qpvuntsm hidden 230dd059 (empty) (no description set)
+       diff --git a/file b/file
+       new file mode 100644
+       index 0000000000..7898192261
+       --- /dev/null
+       +++ b/file
+       @@ -1,0 +1,1 @@
+       +a
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show", "@", "-p", "--git"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    8f6a879bef11 test-username@host.example.com 2001-02-03 04:05:08.000 +07:00 - 2001-02-03 04:05:08.000 +07:00
+    new empty commit
+    args: jj new
+
+    Changed commits:
+    ○  Change rlvkpnrzqnoo
+       + rlvkpnrz 56950632 (empty) (no description set)
+    "###);
+
+    // Squash the working copy commit.
+    std::fs::write(repo_path.join("file"), "b\n").unwrap();
+    let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["squash"]);
+    insta::assert_snapshot!(&stdout, @"");
+    insta::assert_snapshot!(&stderr, @r###"
+    Working copy now at: mzvwutvl 9f4fb57f (empty) (no description set)
+    Parent commit      : qpvuntsm 2ac85fd1 (no description set)
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show", "-p", "--git"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    c53f5f1afbc6 test-username@host.example.com 2001-02-03 04:05:11.000 +07:00 - 2001-02-03 04:05:11.000 +07:00
+    squash commits into 6b1027d2770cd0a39c468e525e52bf8c47e1464a
+    args: jj squash
+
+    Changed commits:
+    ○  Change mzvwutvlkqwt
+    │  + mzvwutvl 9f4fb57f (empty) (no description set)
+    │ ○  Change rlvkpnrzqnoo
+    ├─╯  - rlvkpnrz hidden 1d7f8f94 (no description set)
+    │    diff --git a/file b/file
+    │    index 7898192261..6178079822 100644
+    │    --- a/file
+    │    +++ b/file
+    │    @@ -1,1 +1,1 @@
+    │    -a
+    │    +b
+    ○  Change qpvuntsmwlqt
+       + qpvuntsm 2ac85fd1 (no description set)
+       - qpvuntsm hidden 6b1027d2 (no description set)
+       diff --git a/file b/file
+       index 7898192261..6178079822 100644
+       --- a/file
+       +++ b/file
+       @@ -1,1 +1,1 @@
+       -a
+       +b
+    "###);
+
+    // Abandon the working copy commit.
+    let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["abandon"]);
+    insta::assert_snapshot!(&stdout, @"");
+    insta::assert_snapshot!(&stderr, @r###"
+    Abandoned commit mzvwutvl 9f4fb57f (empty) (no description set)
+    Working copy now at: yqosqzyt 33f321c4 (empty) (no description set)
+    Parent commit      : qpvuntsm 2ac85fd1 (no description set)
+    "###);
+    let stdout = test_env.jj_cmd_success(&repo_path, &["op", "show", "-p", "--git"]);
+    insta::assert_snapshot!(&stdout, @r###"
+    e13dc1c7a3b3 test-username@host.example.com 2001-02-03 04:05:13.000 +07:00 - 2001-02-03 04:05:13.000 +07:00
+    abandon commit 9f4fb57fba25a7b47ce5980a5d9a4766778331e8
+    args: jj abandon
+
+    Changed commits:
+    ○  Change yqosqzytrlsw
+       + yqosqzyt 33f321c4 (empty) (no description set)
+    ○  Change mzvwutvlkqwt
+       - mzvwutvl hidden 9f4fb57f (empty) (no description set)
+    "###);
+}
+
 fn init_bare_git_repo(git_repo_path: &Path) -> git2::Repository {
     let git_repo = git2::Repository::init_bare(git_repo_path).unwrap();
     let git_blob_oid = git_repo.blob(b"some content").unwrap();