WikiLink aliases (#181)

* Added ability to remove link alias

* Added spaces regex 'note | alias' will be displayed correctly.

* show_backlinks

* find_friends

* Fixed simple link processing

* updated style

hide link body when it's aliased

* Review fix

* syntax review fix

* more fixeS

* Documentation

* format fix

* Added documentation

doc/telekasten.txt

@@ -475,10 +475,18 @@ groups:
 - `tkBrackets` : the brackets surrounding the link title
 - `tkHighlight` : ==highlighted== text (non-standard markdown)
 - `tkTag` :  well, tags
+- `tkAliasedLink` : link with alias
+- `tkHighlightedAliasedLink` : link with alias in `tkAliasedLink`
+- `tkLinkAlias` : body of the link (left part of `[[aaa|bbb]]`)
+- `tkLinkBody` : alias of the link (right part of `[[aaa|bbb]]`)
 
 `tkHighlight`, has nothing to do with links but I added it anyway, since I like
 highlighting text when taking notes.
 
+Plugin supports wiki-link aliases: `[[value|alias]]`. These links will be
+concealed to `[[alias]]` if `conceallevel=2`.
+
+
 I also like the navigation buttons of the calendar to appear less prevalent, so
 I redefine the `CalNavi` class as well.
 
@@ -736,6 +744,9 @@ Note links~
 `[[A cool title#^xxxxxxxx]]`  ....... links to the paragraph with id ^xxxxxxxx
                                     within the note named 'A cool title'
 
+`[[A cool title|xxxxxxxx]]`  ........ links note 'A cool title' with using
+                                    name.
+
 `[[#Heading 27]]`  .................. links to the heading 'Heading 27' within
                                     all notes
 

lua/telekasten.lua

@@ -173,6 +173,14 @@ local function escape(s)
     return string.gsub(s, "[%%%]%^%-$().[*+?]", "%%%1")
 end
 
+local function remove_alias(link)
+    local split_index = string.find(link, "%s*|")
+    if split_index ~= nil and type(split_index) == "number" then
+        return string.sub(link, 0, split_index - 1)
+    end
+    return link
+end
+
 local function file_exists(fname)
     if fname == nil then
         return false
@@ -1629,12 +1637,13 @@ local function FindFriends(opts)
 
     vim.cmd("normal yi]")
     local title = vim.fn.getreg('"0')
+    title = remove_alias(title)
     title = title:gsub("^(%[)(.+)(%])$", "%2")
 
     builtin.live_grep({
         prompt_title = "Notes referencing `" .. title .. "`",
         cwd = M.Cfg.home,
-        default_text = "\\[\\[" .. title .. "\\]\\]",
+        default_text = "\\[\\[" .. title .. "([#|].+)?\\]\\]",
         find_command = M.Cfg.find_command,
         attach_mappings = function(_, map)
             actions.select_default:replace(picker_actions.select_default)
@@ -1965,7 +1974,7 @@ local function ShowBacklinks(opts)
         prompt_title = "Search",
         cwd = M.Cfg.home,
         search_dirs = { M.Cfg.home },
-        default_text = "\\[\\[" .. title .. "(#.+)*\\]\\]",
+        default_text = "\\[\\[" .. title .. "([#|].+)?\\]\\]",
         find_command = M.Cfg.find_command,
         attach_mappings = function(_, map)
             actions.select_default:replace(picker_actions.select_default)
@@ -2181,6 +2190,7 @@ local function FollowLink(opts)
             -- we are in a link
             vim.cmd("normal yi]")
             title = vim.fn.getreg('"0')
+            title = remove_alias(title)
             title = title:gsub("^(%[)(.+)(%])$", "%2")
         else
             -- we are in an external [link]

syntax/telekasten.vim

@@ -9,7 +9,7 @@ unlet b:current_syntax
 syn region Comment matchgroup=Comment start="<!--" end="-->"  contains=tkTag keepend
 
 syntax region tkLink matchgroup=tkBrackets start=/\[\[/ end=/\]\]/ display oneline 
-syntax region tkHighlight matchgroup=tkBrackets start=/==/ end=/==/ display oneline
+syntax region tkHighlight matchgroup=tkBrackets start=/==/ end=/==/ display oneline contains=tkHighlightedAliasedLink
 
 syntax match tkTag "\v#[a-zA-ZÀ-ÿ]+[a-zA-ZÀ-ÿ0-9/\-_]*"
 syntax match tkTag "\v:[a-zA-ZÀ-ÿ]+[a-zA-ZÀ-ÿ0-9/\-_]*:"
@@ -17,19 +17,24 @@ syntax match tkTag "\v:[a-zA-ZÀ-ÿ]+[a-zA-ZÀ-ÿ0-9/\-_]*:"
 syntax match tkTagSep "\v\s*,\s*" contained
 syntax region tkTag matchgroup=tkBrackets start=/^tags\s*:\s*\[\s*/ end=/\s*\]\s*$/ contains=tkTagSep display oneline
 
+syntax region tkAliasedLink start="\[\[[^\]]\+|" end="\]\]" keepend oneline contains=tkLinkAlias,tkLinkBody
+syntax region tkHighlightedAliasedLink start="\[\[[^\]]\+|" end="\]\]" keepend oneline contained contains=tkLinkAlias,tkLinkBody
+syntax region tkLinkAlias start="|"ms=s+1 end=".+\]\]"me=e-2 keepend contained
+syntax region tkLinkBody start="\[\["ms=s+2 end="|" keepend contained conceal
 
 let b:current_syntax = 'telekasten'
 
 " " just blue
-"     hi tklink ctermfg=Blue cterm=bold,underline
+"     hi tkLink ctermfg=Blue cterm=bold,underline
 "     hi tkBrackets ctermfg=gray
 
 " " for gruvbox
-"     hi tklink ctermfg=72 cterm=bold,underline
+"     hi tkLink ctermfg=72 cterm=bold,underline
 "     hi tkBrackets ctermfg=gray
 
 " " Highlight ==highlighted== text
 "     hi tkHighlight ctermbg=yellow ctermfg=darkred cterm=bold
+
 "
 " " Tags
 "     hi tkTagSep ctermfg=gray