> On Thu, Jul 1, 2010 at 4:42 AM, Gary Johnson <garyjohn@spocom.com> wrote:
>
> On 2010-06-30, X Heruacles wrote:
>
> > On Wed, Jun 30, 2010 at 3:42 PM, Gary Johnson <garyjohn@spocom.com>
> wrote:
> >
> > On 2010-06-30, X Heruacles wrote:
> > > I'm just learning lua and I use vim to navigate some lua projects.
> > > I use ctags to generate tags using a map:
> > >
> > > map <F12> <Esc>:!ctags -R .<CR>
> > >
> > > but it rarely helps. When I want to jump to some
> > > function definition, it always errs. Then I checked
> > > the generated tag and it seems fine. So my question is
> > > just is there a better way to navigate lua
> > > project?(esp. jumping to function definition?)
> >
> > I don't know what else might be available for navigating Lua, but
> > the ctags web page at SourceForge says that it understands Lua, and
> > you write that the tags appear fine, so I would suggest that you
> > find out why your Lua tags aren't working as you expect and fix that
> > problem. If you post a short file containing Lua code and explain
> > what you do and what happens when you try to jump to a tag in that
> > code, we might be able to spot the problem and give you a solution.
> >
> > Regards,
> > Gary
>
> > thanks Gary. Then I show the code here:
> > the generated tag has a line looks like this:
> >
> > TaskHandler.prizeTask .\init\taskHandler.lua /^function
> > TaskHandler.prizeTask(plr, task)$/;" f
> >
> > and I have a function:
> >
> > function Task:succeed()
> >
> > debug_log("Task:succeed")
> >
> > self.isSucceed = true
> >
> > TaskHandler.prizeTask(self.owner, self)
> >
> > self:eventOnSuccess()
> >
> > if self.spanTimerId > 0 then self:clearSpanTimer() end
> >
> > self.owner:addFinishedTask(self)
> >
> > if self.entry.type == taskType.TASK_TYPE_MAIN then
> >
> > self.owner:setSaveRecord("MainTask", self:getId(), 0)
> >
> > else
> >
> > end
> >
> > if self.entry.nexttask ~= nil and self.entry.nexttask ~= 0 then
> >
> > debug_log("self.owner:addTask")
> >
> > self.owner:addTask(self.entry.nexttask)
> >
> > end
> >
> > end
> >
> >
> >
> > in the file task.lua in the subdirectory of where the tags file lies.
> > While my cursor on "prizeTask", I press Ctrl-], only to find
> > it shows me an error that can't find the tag: prizeTask. So
> > it is.
[...]
> So I think that's the problem: you need to have . in your
> 'iskeyword' option for Lua files.
> Sorry for the late reply Gary and thank you very much that it works!!!
> But there are others that can't work, so I want to know why this helps. I tried
> to read some help file about iskeyword and isfname, but it hardly did help. So
> I ask you do me a favor to describe the keyword and how it works?(maybe this
> won't waste too much of your time)
> Thank you again:)
I'll try. Bear in mind that I don't know anything about Lua.
Ctags knows Lua syntax, so it recognizes "TaskHandler.prizeTask" as
a single entity for which it should create a tag. It creates a tag
for "TaskHandler.prizeTask" and writes it to the tags file.
When you type ^], Vim looks at the character under the cursor and
the characters next to it and tries to identify a sequence of
characters including the one under the cursor that form a keyword,
by Vim's definition of a keyword. Vim then tries to find that
keyword in its list of tags.
Vim's definition of a keyword is a sequence of characters from the
set in the 'iskeyword' option. Vim uses this definition for a lot
of its commands, not just those related to tags. For example, it
uses that definition to recognize words when executing w to move to
the next word or diw to delete the word the cursor is on.
Consequently, Vim's default definition of 'iskeyword' is set to
correspond to a word as commonly used in text or a keyword as used
in most programming languages: a sequence of characters from the
set of alphanumeric characters and underscore.
When you move Vim's cursor to the start of the Lua identifier
TaskHandler.prizeTask and type ^], Vim will try to find the keyword
under the cursor, which by its normal definition is "TaskHandler".
"TaskHandler" is not a tag, though, so the command fails.
Similarly, Vim recognizes "prizeTask" as a keyword but it is not a
tag, either. You can make this work by adding . to the set of
characters that Vim recognizes as part of a keyword, that is, by
adding . to 'iskeyword':
:set iskeyword+=.
Now Vim will recognize "TaskHandler.prizeTask" as a single keyword
and will successfully find it in its list of tags.
The problem with this solution is that Vim will now include . as
part of a word any time it does something with a word. For example,
if you moved the cursor to the word "tags" at the end of the
preceding paragraph and typed '*', Vim would search for the next
occurrence of "tags.", including the period, not just "tags".
I hope that was clear and not too much.
Regards,
Gary
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