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Add the merge_lists template function

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Kovid Goyal 2011-05-27 09:36:38 -06:00
commit 44f1d19cda
2 changed files with 27 additions and 1 deletions
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3
src/calibre/manual/template_lang.rst
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@ -253,6 +253,7 @@ The following functions are available in addition to those described in single-f
* ``eval(string)`` -- evaluates the string as a program, passing the local variables (those ``assign`` ed to). This permits using the template processor to construct complex results from local variables.
* ``not(value)`` -- returns the string "1" if the value is empty, otherwise returns the empty string. This function works well with test or first_non_empty. You can have as many values as you want.
* ``merge_lists(list1, list2, separator)`` -- return a list made by merging the items in list1 and list2, removing duplicate items using a case-insensitive compare. If items differ in case, the one in list1 is used. The items in list1 and list2 are separated by separator, as are the items in the returned list.
* ``multiply(x, y)`` -- returns x * y. Throws an exception if either x or y are not numbers.
* ``or(value, value, ...)`` -- returns the string "1" if any value is not empty, otherwise returns the empty string. This function works well with test or first_non_empty. You can have as many values as you want.
* ``print(a, b, ...)`` -- prints the arguments to standard output. Unless you start calibre from the command line (``calibre-debug -g``), the output will go to a black hole.
@ -271,7 +272,7 @@ Function classification summary:
* If-then-else: ``contains``, ``test``
* Iterating over values: ``first_non_empty``, ``lookup``, ``switch``
* List lookup: ``in_list``, ``list_item``, ``select``,
* List manipulation: ``count``, ``sublist``, ``subitems``
* List manipulation: ``count``, ``merge_lists``, ``sublist``, ``subitems``
* Recursion: ``eval``, ``template``
* Relational: ``cmp`` , ``strcmp`` for strings
* String case changes: ``lowercase``, ``uppercase``, ``titlecase``, ``capitalize``

25
src/calibre/utils/formatter_functions.py
View File

@ -642,6 +642,30 @@ class BuiltinNot(BuiltinFormatterFunction):
i += 1
return ''
class BuiltinMergeLists(BuiltinFormatterFunction):
name = 'merge_lists'
arg_count = 3
doc = _('merge_lists(list1, list2, separator) -- '
'return a list made by merging the items in list1 and list2, '
'removing duplicate items using a case-insensitive compare. If '
'items differ in case, the one in list1 is used. '
'The items in list1 and list2 are separated by separator, as are '
'the items in the returned list.')
def evaluate(self, formatter, kwargs, mi, locals, list1, list2, separator):
l1 = [l.strip() for l in list1.split(separator) if l.strip()]
l2 = [l.strip() for l in list2.split(separator) if l.strip()]
lcl1 = set([icu_lower(l) for l in l1])
res = []
for i in l1:
res.append(i)
for i in l2:
if icu_lower(i) not in lcl1:
res.append(i)
return ', '.join(sorted(res, key=sort_key))
builtin_add = BuiltinAdd()
builtin_and = BuiltinAnd()
builtin_assign = BuiltinAssign()
@ -660,6 +684,7 @@ builtin_in_list = BuiltinInList()
builtin_list_item = BuiltinListitem()
builtin_lookup = BuiltinLookup()
builtin_lowercase = BuiltinLowercase()
builtin_merge_lists = BuiltinMergeLists()
builtin_multiply = BuiltinMultiply()
builtin_not = BuiltinNot()
builtin_or = BuiltinOr()