templater: use templatefunc to mark a function as template function Using decorator can localize changes for adding (or removing) a template function in source code. This patch also removes leading ":FUNC(ARG...):" part in help document of each function, because using templatefunc makes it useless. This patch uses not 'func' but 'templatefunc' as a decorator name, because the former is too generic one, even though the latter is a little redundant in 'templater.py'.

registrar: add templatefunc to mark a function as template function (API) This patch also adds loadfunction() to templater, because this combination helps to figure out how they cooperate with each other. Listing up loadfunction() in dispatch.extraloaders causes implicit loading template function at loading (3rd party) extension. This patch explicitly tests whether templatefunc decorator works as expected, because there is no bundled extension, which defines template function. This change requires that "templatefunc" attribute of (3rd party) extension is registrar.templatefunc or so.

keyword: use templatefilter to mark a function as template filter This patch also adds test for filter 'svnisodate' and 'svnutcdate' for safety, because there is no test using them, yet.

templatefilters: use templatefilter to mark a function as template filter Using decorator can localize changes for adding (or removing) a template filter function in source code. This patch also removes leading ":FILTER:" part in help document of each filters, because using templatefilter makes it useless. This patch uses not 'filter' but 'templatefilter' as a decorator name, because the former name hides Python built-in one, even though the latter is a little redundant in 'templatefilters.py'.

registrar: add templatefilter to mark a function as template filter (API) This patch also adds loadfilter() to templatefilters, because this combination helps to figure out how they cooperate with each other. Listing up loadfilter() in dispatch.extraloaders causes implicit loading template filter functions at loading (3rd party) extension. This change requires that "templatefilter" attribute of (3rd party) extension is registrar.templatefilter or so.

revset: inline _getaliasarg() function This function is now much simpler than before. Inlining small functions helps to extract a reusable alias processor.