wireproto: remove todict() and use {} literals instead

merge with stable

templater: deprecate --style now that -T exists

templating: make -T much more flexible It can now accept styles and paths and references to settings in [templates].

changeset_templater: remove use_template method

cmdutil: make helper function to process template args

commands: add -T alternative to --template

config: clarify and exemplify the user name in the sample config file

templater: make strings in template expressions be "string-escape"-ed correctly Changeset 64b4f0cd7336 (released with 2.8.1) fixed "recursively evaluate string literals as templates" problem (issue4102) by moving the location of "string-escape"-ing from "tokenizer()" to "compiletemplate()". But some parts in template expressions below are not processed by "compiletemplate()", and it may cause unexpected result. - 'expr' of 'if(expr, then, else)' - 'expr's of 'ifeq(expr, expr, then, else)' - 'sep' of 'join(list, sep)' - 'text' and 'style' of 'rstdoc(text, style)' - 'text' and 'chars' of 'strip(text, chars)' - 'pat' and 'repl' of 'sub(pat, repl, expr)' For example, '\n' of "{join(extras, '\n')}" is not "string-escape"-ed and treated as a literal '\n'. This breaks "Display the contents of the 'extra' field, one per line" example in "hg help templates". Just "string-escape"-ing on each parts above may not work correctly, because inside expression of nested ones already applies "string-escape" on string literals. For example: - "{join(files, '\n')}" doesn't return "string-escape"-ed string, but - "{join(files, if(branch, '\n', '\n'))}" does To fix this problem, this patch does: - introduce "rawstring" token and "runrawstring" method to handle strings not to be "string-escape"-ed correctly, and - make "runstring" method return "string-escape"-ed string, and delay "string-escape"-ing until evaluation This patch invokes "compiletemplate()" with "strtoken=exp[0]" in "gettemplate()", because "exp[1]" is not yet evaluated. This code path is tested via mapping ("expr % '{template}'"). In the other hand, this patch invokes it with "strtoken='rawstring'" in "_evalifliteral()", because "t" is the result of "arg" evaluation and it should be "string-escape"-ed if "arg" is "string" expression. This patch doesn't test "string-escape"-ing on 'expr' of 'if(expr, then, else)', because it doesn't affect the result.

templater: apply "stringify()" on sub expression to get string correctly Templating syntax allows nested expression to be specified as parts below, but they are evaluated as a generator and don't work correctly. - 'sep' of 'join(list, sep)' - 'text' and 'chars' of 'strip(text, chars)' In the former case, 'sep' returns expected string only for the first separation, and empty one for the second or later, because the generator has only one element. In the latter case, templating is aborted by exception, because the generator doesn't have 'strip()' method (as 'text') and can't be passed as the argument to 'str.strip()' (as 'chars'). This patch applies "stringify()" on these sub expression to get string correctly.