feat: support unespacing backslash when following wikilinks (#211)

* feat: support unespacing backslash when following wikilinks

Allow user to escape wikilink in certain case, e.g. within a table.

| Column1 | Column2            | Column3 || ------- | ------------------ | ------- || Item1   | [[NOTE-ID\|TITLE]] | Item1   |

* chore: add test case for removing single backslash

* chore: use assert.equals instead of assert.equal

lua/obsidian/command.lua

@@ -546,6 +546,9 @@ command.follow = function(client, _)
   end
 
   local note_name = current_line:sub(open, close)
+
+  note_name = util.unescape_single_backslash(note_name)
+
   if note_name:match "^%[.-%]%(.*%)$" then
     -- transform markdown link to wiki link
     note_name = note_name:gsub("^%[(.-)%]%((.*)%)$", "%2|%1")

lua/obsidian/util.lua

@@ -660,4 +660,9 @@ util.gf_passthrough = function()
   end
 end
 
+-- This function removes a single backslash within double square brackets
+util.unescape_single_backslash = function(text)
+  return text:gsub("(%[%[[^\\]+)\\(%|[^\\]+]])", "%1%2")
+end
+
 return util

test/obsidian/util_spec.lua

@@ -89,4 +89,9 @@ describe("obsidian.util", function()
     assert.equal(util.escape_magic_characters "foo?bar", "foo%?bar")
     assert.equal(util.escape_magic_characters "foo%bar", "foo%%bar")
   end)
+  it("should correctly remove single backslash", function()
+    -- [[123\|NOTE1]] should get [[123|NOTE1]] in markdown file
+    -- in lua, it needs to be with double backslash '\\'
+    assert.equals(util.unescape_single_backslash "[[foo\\|bar]]", "[[foo|bar]]")
+  end)
 end)