Templates¶
Jujutsu supports a functional language to customize output of commands. The language consists of literals, keywords, operators, functions, and methods.
A couple of jj
commands accept a template via -T
/--template
option.
Keywords¶
Keywords represent objects of different types; the types are described in
a follow-up section. In addition to context-specific keywords, the top-level
object can be referenced as self
.
Commit keywords¶
In jj log
/jj evolog
templates, all 0-argument methods of the Commit
type are available as keywords. For example, commit_id
is
equivalent to self.commit_id()
.
Operation keywords¶
In jj op log
templates, all 0-argument methods of the Operation
type are available as keywords. For example,
current_operation
is equivalent to self.current_operation()
.
Operators¶
The following operators are supported.
x.f()
: Method call.-x
: Negate integer value.!x
: Logical not.x && y
: Logical and, short-circuiting.x || y
: Logical or, short-circuiting.x ++ y
: Concatenatex
andy
templates.
(listed in order of binding strengths)
Global functions¶
The following functions are defined.
fill(width: Integer, content: Template) -> Template
: Fill lines at the givenwidth
.indent(prefix: Template, content: Template) -> Template
: Indent non-empty lines by the givenprefix
.label(label: Template, content: Template) -> Template
: Apply label to the content. Thelabel
is evaluated as a space-separated string.if(condition: Boolean, then: Template[, else: Template]) -> Template
: Conditionally evaluatethen
/else
template content.coalesce(content: Template...) -> Template
: Returns the first non-empty content.concat(content: Template...) -> Template
: Same ascontent_1 ++ ... ++ content_n
.separate(separator: Template, content: Template...) -> Template
: Insert separator between non-empty contents.surround(prefix: Template, suffix: Template, content: Template) -> Template
: Surround non-empty content with texts such as parentheses.
Types¶
Boolean type¶
No methods are defined. Can be constructed with false
or true
literal.
Commit type¶
This type cannot be printed. The following methods are defined.
description() -> String
change_id() -> ChangeId
commit_id() -> CommitId
parents() -> List<Commit>
author() -> Signature
committer() -> Signature
mine() -> Boolean
: Commits where the author's email matches the email of the current user.working_copies() -> String
: For multi-workspace repository, indicate working-copy commit as<workspace name>@
.current_working_copy() -> Boolean
: True for the working-copy commit of the current workspace.bookmarks() -> List<RefName>
: Local and remote bookmarks pointing to the commit. A tracking remote bookmark will be included only if its target is different from the local one.local_bookmarks() -> List<RefName>
: All local bookmarks pointing to the commit.remote_bookmarks() -> List<RefName>
: All remote bookmarks pointing to the commit.tags() -> List<RefName>
git_refs() -> List<RefName>
git_head() -> Option<RefName>
divergent() -> Boolean
: True if the commit's change id corresponds to multiple visible commits.hidden() -> Boolean
: True if the commit is not visible (a.k.a. abandoned).immutable() -> Boolean
: True if the commit is included in the set of immutable commits.contained_in(revset: String) -> Boolean
: True if the commit is included in the provided revset.conflict() -> Boolean
: True if the commit contains merge conflicts.empty() -> Boolean
: True if the commit modifies no files.diff([files: String]) -> TreeDiff
: Changes from the parents within thefiles
expression. All files are compared by default, but it is likely to change in future version to respect the command line path arguments.root() -> Boolean
: True if the commit is the root commit.
CommitId / ChangeId type¶
The following methods are defined.
.normal_hex() -> String
: Normal hex representation (0-9a-f), useful for ChangeId, whose canonical hex representation is "reversed" (z-k)..short([len: Integer]) -> String
.shortest([min_len: Integer]) -> ShortestIdPrefix
: Shortest unique prefix.
Integer type¶
No methods are defined.
List type¶
A list can be implicitly converted to Boolean
. The following methods are
defined.
.len() -> Integer
: Number of elements in the list..join(separator: Template) -> Template
: Concatenate elements with the givenseparator
..map(|item| expression) -> ListTemplate
: Apply templateexpression
to each element. Example:parents.map(|c| c.commit_id().short())
ListTemplate type¶
The following methods are defined. See also the List
type.
.join(separator: Template) -> Template
Operation type¶
This type cannot be printed. The following methods are defined.
current_operation() -> Boolean
description() -> String
id() -> OperationId
tags() -> String
time() -> TimestampRange
user() -> String
snapshot() -> Boolean
: True if the operation is a snapshot operation.root() -> Boolean
: True if the operation is the root operation.
OperationId type¶
The following methods are defined.
.short([len: Integer]) -> String
Option type¶
An option can be implicitly converted to Boolean
denoting whether the
contained value is set. If set, all methods of the contained value can be
invoked. If not set, an error will be reported inline on method call.
RefName type¶
The following methods are defined.
.name() -> String
: Local bookmark or tag name..remote() -> String
: Remote name or empty if this is a local ref..present() -> Boolean
: True if the ref points to any commit..conflict() -> Boolean
: True if the bookmark or tag is conflicted..normal_target() -> Option<Commit>
: Target commit if the ref is not conflicted and points to a commit..removed_targets() -> List<Commit>
: Old target commits if conflicted..added_targets() -> List<Commit>
: New target commits. The list usually contains one "normal" target..tracked() -> Boolean
: True if the ref is tracked by a local ref. The local ref might have been deleted (but not pushed yet.).tracking_present() -> Boolean
: True if the ref is tracked by a local ref, and if the local ref points to any commit..tracking_ahead_count() -> SizeHint
: Number of commits ahead of the tracking local ref..tracking_behind_count() -> SizeHint
: Number of commits behind of the tracking local ref.
ShortestIdPrefix type¶
The following methods are defined.
.prefix() -> String
.rest() -> String
.upper() -> ShortestIdPrefix
.lower() -> ShortestIdPrefix
Signature type¶
The following methods are defined.
.name() -> String
.email() -> String
.username() -> String
.timestamp() -> Timestamp
SizeHint type¶
This type cannot be printed. The following methods are defined.
.lower() -> Integer
: Lower bound..upper() -> Option<Integer>
: Upper bound if known..exact() -> Option<Integer>
: Exact value if upper bound is known and it equals to the lower bound..zero() -> Boolean
: True if upper bound is known and is0
.
String type¶
A string can be implicitly converted to Boolean
. The following methods are
defined.
.len() -> Integer
: Length in UTF-8 bytes..contains(needle: Template) -> Boolean
.first_line() -> String
.lines() -> List<String>
: Split into lines excluding newline characters..upper() -> String
.lower() -> String
.starts_with(needle: Template) -> Boolean
.ends_with(needle: Template) -> Boolean
.remove_prefix(needle: Template) -> String
: Removes the passed prefix, if present.remove_suffix(needle: Template) -> String
: Removes the passed suffix, if present.substr(start: Integer, end: Integer) -> String
: Extract substring. Thestart
/end
indices should be specified in UTF-8 bytes. Negative values count from the end of the string.
String literals¶
String literals must be surrounded by single or double quotes ('
or "
).
A double-quoted string literal supports the following escape sequences:
\"
: double quote\\
: backslash\t
: horizontal tab\r
: carriage return\n
: new line\0
: null
Other escape sequences are not supported. Any UTF-8 characters are allowed
inside a string literal, with two exceptions: unescaped "
-s and uses of \
that don't form a valid escape sequence.
A single-quoted string literal has no escape syntax. '
can't be expressed
inside a single-quoted string literal.
Template type¶
Most types can be implicitly converted to Template
. No methods are defined.
Timestamp type¶
The following methods are defined.
.ago() -> String
: Format as relative timestamp..format(format: String) -> String
: Format with the specified strftime-like format string..utc() -> Timestamp
: Convert timestamp into UTC timezone..local() -> Timestamp
: Convert timestamp into local timezone.
TimestampRange type¶
The following methods are defined.
.start() -> Timestamp
.end() -> Timestamp
.duration() -> String
TreeDiff type¶
This type cannot be printed. The following methods are defined.
.color_words([context: Integer]) -> Template
: Format as a word-level diff with changes indicated only by color..git([context: Integer]) -> Template
: Format as a Git diff..stat(width: Integer) -> Template
: Format as a histogram of the changes..summary() -> Template
: Format as a list of status code and path pairs.
Configuration¶
The default templates and aliases() are defined in the [templates]
and
[template-aliases]
sections of the config respectively. The exact definitions
can be seen in the cli/src/config/templates.toml
file in jj's source tree.
New keywords and functions can be defined as aliases, by using any combination of the predefined keywords/functions and other aliases.
Alias functions can be overloaded by the number of parameters. However, builtin function will be shadowed by name, and can't co-exist with aliases.
For example:
[template-aliases]
'commit_change_ids' = '''
concat(
format_field("Commit ID", commit_id),
format_field("Change ID", commit_id),
)
'''
'format_field(key, value)' = 'key ++ ": " ++ value ++ "\n"'
Examples¶
Get short commit IDs of the working-copy parents:
jj log --no-graph -r @ -T 'parents.map(|c| c.commit_id().short()).join(",")'
Show machine-readable list of full commit and change IDs:
jj log --no-graph -T 'commit_id ++ " " ++ change_id ++ "\n"'