add primitive document symbol support

[jackielii]

try to fix #347

Currently it deals with Go symbols + parser.HTMLTemplate

TODOs:

1. deal with documentSymbol as well
2. add other symbols (css, script)?
3. add correct containerName?

[jackielii]

OK, I admit there is a big problem with my approach: I didn't convert the templ URI to the Go URI, yet somehow it worked.

It seems gopls is good at parsing partial results and skip over invalid block, therefore all the non templ elements are all returned. I then parsed and added the templ elements, namely parser.HTMLTemplate, making the result correct....

[joerdav]

Is this ready to be reviewed @jackielii ?

[joerdav]

I tested this on https://github.com/joerdav/shopping-list/blob/main/app/listsweb/list.templ

And I got the following symbols:

app/listsweb/list.templ|58 col 7| [Function] ListItems(list List, availableItems []Item)
app/listsweb/list.templ|96 col 7| [Function] ListPage(urlpath string, list List, availableRecipes []Recipe, availableItems []Item)
app/listsweb/list.templ|134 col 7| [Function] ListsPage(path string, lists []ListSummary)
app/listsweb/list.templ|18 col 7| [Function] ListRecipes( list List, availableRecipes []Recipe, )

I expected to also see the go functions there recipeInList and itemInList

[joerdav]

I spotted the TODO, oops! Thanks for the PR by the way, it's looking to be almost there!

[jackielii]

I've been using it, works most of the time. But because it uses gopls to parse the templ files directly. It has quite a few broken cases. I'll redo it using the proper way by converting to go files and find mapping symbols.

[a-h]

Legend. 😀