cli: hide irrelevant information about root commit in default log templates

I've extracted the `builtin_log_root` template for users to customize the
default templates without fully overriding them, for example I would remove
the change_id/commit_id for myself - and we discussed in Discord that leaving
those makes sense for the user to be reminded/teached that the root commit has
a change id made from z's.

CHANGELOG.md

@@ -31,6 +31,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### New features
 
+* Default template for `jj log` now does not show irrelevant information
+  (timestamp, empty, message placeholder etc.) about the root commit.
+
 * Commit templates now support the `root` keyword, which is `true` for the root
   commit and `false` for every other commit.
 

cli/src/config/colors.toml

@@ -33,6 +33,7 @@
 "conflict" = "red"
 "empty" = "green"
 "separator" = "bright black"
+"root" = {fg = "bright green", bold = true}
 
 "working_copy" = { bold = true }
 "working_copy commit_id" = "bright blue"

cli/src/config/templates.toml

@@ -29,7 +29,10 @@ op_log = 'builtin_op_log_compact'
 show = 'builtin_log_detailed'
 
 [template-aliases]
-'builtin_log_oneline' = '''label(if(current_working_copy, "working_copy"),
+'builtin_log_oneline' = '''
+if(root,
+  builtin_log_root(change_id, commit_id),
+  label(if(current_working_copy, "working_copy"),
     concat(
       separate(" ",
         label(
@@ -49,9 +52,13 @@ show = 'builtin_log_detailed'
         if(description, description.first_line(), description_placeholder),
       ) ++ "\n",
     ),
+  )
 )
 '''
-'builtin_log_compact' = '''label(if(current_working_copy, "working_copy"),
+'builtin_log_compact' = '''
+if(root,
+  builtin_log_root(change_id, commit_id),
+  label(if(current_working_copy, "working_copy"),
     concat(
       separate(" ",
         label(
@@ -73,6 +80,7 @@ show = 'builtin_log_detailed'
         if(description, description.first_line(), description_placeholder),
       ) ++ "\n",
     ),
+  )
 )
 '''
 builtin_log_comfortable = 'builtin_log_compact ++ "\n"'
@@ -104,6 +112,15 @@ label(if(current_operation, "current_operation"),
 '''
 builtin_op_log_comfortable = 'builtin_op_log_compact ++ "\n"'
 
+'builtin_log_root(change_id, commit_id)' = '''
+separate(" ",
+  format_short_change_id(change_id),
+  label("root", "root"),
+  format_short_commit_id(commit_id),
+  branches
+)
+'''
+
 'description_placeholder' = 'label("description", "(no description set)")'
 'commit_summary_separator' = 'label("separator", " | ")'
 

cli/tests/test_alias.rs

@@ -137,8 +137,7 @@ fn test_alias_cannot_override_builtin() {
     // Alias should be ignored
     let stdout = test_env.jj_cmd_success(&repo_path, &["log", "-r", "root"]);
     insta::assert_snapshot!(stdout, @r###"
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 }
 

cli/tests/test_commit_template.rs

@@ -128,8 +128,7 @@ fn test_log_default() {
     │  (empty) description 1
     ◉  qpvuntsm test.user@example.com 2001-02-03 04:05:08.000 +07:00 4291e264
     │  add a file
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 
     // Color
@@ -139,8 +138,7 @@ fn test_log_default() {
     │  (empty) description 1
     ◉  qpvuntsm test.user@example.com 2001-02-03 04:05:08.000 +07:00 4291e264
     │  add a file
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 
     // Color without graph
@@ -150,8 +148,7 @@ fn test_log_default() {
     (empty) description 1
     qpvuntsm test.user@example.com 2001-02-03 04:05:08.000 +07:00 4291e264
     add a file
-    zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-    (empty) (no description set)
+    zzzzzzzz root 00000000
     "###);
 }
 
@@ -164,23 +161,20 @@ fn test_log_builtin_templates() {
 
     insta::assert_snapshot!(render(r#"builtin_log_oneline"#), @r###"
     @  qpvuntsm test.user 2001-02-03 04:05:07.000 +07:00 230dd059 (empty) (no description set)
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000 (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 
     insta::assert_snapshot!(render(r#"builtin_log_compact"#), @r###"
     @  qpvuntsm test.user@example.com 2001-02-03 04:05:07.000 +07:00 230dd059
     │  (empty) (no description set)
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 
     insta::assert_snapshot!(render(r#"builtin_log_comfortable"#), @r###"
     @  qpvuntsm test.user@example.com 2001-02-03 04:05:07.000 +07:00 230dd059
     │  (empty) (no description set)
     │
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
-
+    ◉  zzzzzzzz root 00000000
     "###);
 
     insta::assert_snapshot!(render(r#"builtin_log_detailed"#), @r###"
@@ -214,8 +208,7 @@ fn test_log_obslog_divergence() {
     insta::assert_snapshot!(stdout, @r###"
     @  qpvuntsm test.user@example.com 2001-02-03 04:05:08.000 +07:00 7a17d52e
     │  description 1
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 
     // Create divergence
@@ -230,8 +223,7 @@ fn test_log_obslog_divergence() {
     │  description 2
     │ @  qpvuntsm?? test.user@example.com 2001-02-03 04:05:08.000 +07:00 7a17d52e
     ├─╯  description 1
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 
     // Color
@@ -241,8 +233,7 @@ fn test_log_obslog_divergence() {
     │  description 2
     │ @  qpvuntsm?? test.user@example.com 2001-02-03 04:05:08.000 +07:00 7a17d52e
     ├─╯  description 1
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 
     // Obslog and hidden divergent
@@ -283,8 +274,7 @@ fn test_log_git_head() {
     │  initial
     ◉  qpvuntsm test.user@example.com 2001-02-03 04:05:07.000 +07:00 master HEAD@git 230dd059
     │  (empty) (no description set)
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 }
 
@@ -309,8 +299,7 @@ fn test_log_customize_short_id() {
     insta::assert_snapshot!(stdout, @r###"
     @  Q_pvun test.user@example.com 2001-02-03 04:05:08.000 +07:00 6_9542
     │  (empty) first
-    ◉  Z_zzzz 1970-01-01 00:00:00.000 +00:00 0_0000
-       (empty) (no description set)
+    ◉  Z_zzzz root 0_0000
     "###);
 
     // Customize only the change id
@@ -328,7 +317,6 @@ fn test_log_customize_short_id() {
     insta::assert_snapshot!(stdout, @r###"
     @  QPVUNTSM test.user@example.com 2001-02-03 04:05:08.000 +07:00 69542c19
     │  (empty) first
-    ◉  ZZZZZZZZ 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  ZZZZZZZZ root 00000000
     "###);
 }

cli/tests/test_diff_command.rs

@@ -649,8 +649,7 @@ fn test_diff_external_tool() {
     │  --
     │  file1
     │  file2
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
        --
     "###);
 

cli/tests/test_init_command.rs

@@ -321,8 +321,7 @@ fn test_init_git_external_but_git_dir_exists() {
     // The local ".git" repository is unrelated, so no commits should be imported
     let stdout = test_env.jj_cmd_success(&workspace_root, &["log", "-r", "@-"]);
     insta::assert_snapshot!(stdout, @r###"
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 
     // Check that Git HEAD is not set because this isn't a colocated repo

cli/tests/test_log_command.rs

@@ -49,8 +49,7 @@ fn test_log_legacy_range_operator() {
     insta::assert_snapshot!(stdout, @r###"
     @  qpvuntsm test.user@example.com 2001-02-03 04:05:07.000 +07:00 230dd059
     │  (empty) (no description set)
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
     insta::assert_snapshot!(stderr, @r###"
     The `:` revset operator is deprecated. Please switch to `::`.
@@ -59,8 +58,7 @@ fn test_log_legacy_range_operator() {
     insta::assert_snapshot!(stdout, @r###"
     @  qpvuntsm test.user@example.com 2001-02-03 04:05:07.000 +07:00 230dd059
     │  (empty) (no description set)
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
     insta::assert_snapshot!(stderr, @r###"
     The `:` revset operator is deprecated. Please switch to `::`.

cli/tests/test_revset_output.rs

@@ -256,14 +256,12 @@ fn test_alias() {
 
     let stdout = test_env.jj_cmd_success(&repo_path, &["log", "-r", "my-root"]);
     insta::assert_snapshot!(stdout, @r###"
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 
     let stdout = test_env.jj_cmd_success(&repo_path, &["log", "-r", "identity(my-root)"]);
     insta::assert_snapshot!(stdout, @r###"
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
 
     let stderr = test_env.jj_cmd_failure(&repo_path, &["log", "-r", "root & syntax-error"]);
@@ -385,8 +383,7 @@ fn test_bad_alias_decl() {
     // Invalid declaration should be warned and ignored.
     let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["log", "-r", "my-root"]);
     insta::assert_snapshot!(stdout, @r###"
-    ◉  zzzzzzzz 1970-01-01 00:00:00.000 +00:00 00000000
-       (empty) (no description set)
+    ◉  zzzzzzzz root 00000000
     "###);
     insta::assert_snapshot!(stderr, @r###"
     Failed to load "revset-aliases."bad"":  --> 1:1