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Formatter: Quick pass over messages and documentation.

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This commit is contained in:
Charles Haley 2022-10-17 16:51:51 +01:00
parent a7eb71c343
commit 096579e13b
3 changed files with 29 additions and 20 deletions
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18
manual/template_lang.rst
View File

@ -657,11 +657,12 @@ A PTM template begins with:
def evaluate(book, context):
# book is a calibre metadata object
# context is an instance of calibre.utils.formatter.PythonTemplateContext,
# which (currently) contains the following attributes:
# db: a calibre legacy database object
# globals: the template global variable dictionary
# arguments: is a list of arguments if the template is called by a GPM template, otherwise None
# funcs: allows using the Builtin/User functions and Stored GPM/Python templates
# which currently contains the following attributes:
# db: a calibre legacy database object.
# globals: the template global variable dictionary.
# arguments: is a list of arguments if the template is called by a GPM template, otherwise None.
# funcs: used to call Built-in/User functions and Stored GPM/Python templates.
# Example: context.funcs.list_re_group()
# your Python code goes here
return 'a string'
@ -670,7 +671,12 @@ You can add the above text to your template using the context menu, usually acce
The context object supports ``str(context)`` that returns a string of the context's contents, and ``context.attributes`` that returns a list of the attribute names in the context.
The ``context.funcs`` attribute allows using the Builtin and User functions, and also the Stored GPM/Python templates, so that you can execute them directly in your code. The functions can be retrieve by their names. If the name conflicts with a Python keyword, add an underscore to the end of the name.
The ``context.funcs`` attribute allows calling Built-in and User template functions, and Stored GPM/Python templates, so that you can execute them directly in your code. The functions are retrieved using their names. If the name conflicts with a Python keyword, add an underscore to the end of the name. Examples:
.. code-block:: python
context.funcs.list_re_group()
context.funcs.assert_()
Here is an example of a PTM template that produces a list of all the authors for a series. The list is stored in a `Column built from other columns, behaves like tags`. It shows in :guilabel:`Book details` and has the :guilabel:`on separate lines` checked (in :guilabel:`Preferences->Look & feel->Book details`). That option requires the list to be comma-separated. To satisfy that requirement the template converts commas in author names to semicolons then builds a comma-separated list of authors. The authors are then sorted, which is why the template uses author_sort.

9
src/calibre/gui2/dialogs/template_dialog.py
View File

@ -589,10 +589,11 @@ def evaluate(book, context):
# book is a calibre metadata object
# context is an instance of calibre.utils.formatter.PythonTemplateContext,
# which currently contains the following attributes:
# db: a calibre legacy database object
# globals: the template global variable dictionary
# arguments: is a list of arguments if the template is called by a GPM template, otherwise None
# funcs: allows to use the Builtin/User functions and Stored GPM/Python templates
# db: a calibre legacy database object.
# globals: the template global variable dictionary.
# arguments: is a list of arguments if the template is called by a GPM template, otherwise None.
# funcs: used to call Built-in/User functions and Stored GPM/Python templates.
# Example: context.funcs.list_re_group()
# your Python code goes here
return 'a string'

22
src/calibre/utils/formatter.py
View File

@ -868,9 +868,11 @@ class PythonTemplateContext(object):
class FormatterFuncsCaller:
'''
Provides a convenient solution to call the functions loaded in a TemplateFormatter.
The funcs can be called by their name as attributes of this class, with a underscore at the end if the name conflicts with a Python keyword.
If the name contain a illegal character for a attribute (like .:-), use getattr()
Provides a convenient solution to call functions loaded in the
TemplateFormatter. The functions are called using their name as an attribute
of this class, with an underscore at the end if the name conflicts with a
Python keyword. If the name contain a illegal character for a attribute
(like .:-), use getattr(). Example: context.funcs.list_re_group()
'''
def __init__(self, formatter):
@ -905,11 +907,11 @@ class FormatterFuncsCaller:
# special function
if func_name == 'arguments':
raise ValueError(_('Get the arguments from context.arguments instead of calling arguments()'))
raise ValueError(_("Don't call {0}. Instead use {1}").format('arguments()', 'context.arguments'))
if func_name == 'globals':
raise ValueError(_('Get the globals from context.globals instead of calling globals()'))
raise ValueError(_("Don't call {0}. Instead use {1}").format('globals()', 'context.globals'))
if func_name == 'set_globals':
raise ValueError(_("Set globals using context.globals['name'] = val instead of calling set_globals()"))
raise ValueError(_("Don't call {0}. Instead use {1}").format('set_globals()', "context.globals['name'] = val"))
if func_name == 'character':
if _Parser.inlined_function_nodes['character'][0](args):
rslt = _Interpreter.characters.get(args[0])
@ -918,7 +920,7 @@ class FormatterFuncsCaller:
else:
raise ValueError(_('Incorrect number of arguments'))
else:
# builtin/user function and Stored GPM/Python template
# built-in/user template functions and Stored GPM/Python templates
func = formatter.funcs[func_name]
if func.object_type == StoredObjectType.PythonFunction:
rslt = func.evaluate(formatter, formatter.kwargs, formatter.book, formatter.locals, *args)
@ -926,8 +928,8 @@ class FormatterFuncsCaller:
rslt = formatter._eval_sfm_call(func_name, args, formatter.global_vars)
except Exception as e:
# Change the error message to return this used name on the template
e = e.__class__(_('Error in the function {0} :: {1}').format(
# Change the error message to return the name used in the template
e = e.__class__(_('Error in function {0} :: {1}').format(
name,
re.sub(r'\w+\.evaluate\(\)\s*', '', str(e), 1))) # remove UserFunction.evaluate() | Builtin*.evaluate()
e.is_internal = True
@ -936,7 +938,7 @@ class FormatterFuncsCaller:
return call
e = AttributeError(_("no function named {!r} exists").format(name))
e = AttributeError(_("No function named {!r} exists").format(name))
e.is_internal = True
raise e