User configurable latex lsp#2 (#861)

* Adjust tex.lua and default-config for lsp magic

With this commit table elements are added to default-config.lua, which
are referenced in tex.lua. The settings are set to default.

This enables the user to configure settings accordingly inside of
lv-config.lua.
- build arguments
- forwardsearch executable e.g. zathura
- forwardsearch arguments for chosen executable are implemented
  automatically
- handlers for virtual_text, signs, underline and update_in_insert are
  set to the default

* Added Texlab-Build and Forward as which-keys

With this commit the two commands `:TexlabBuild` and `:TexlabForward`
are added as which-keys under the category +LaTeX.

- b is for TexlabBuild
- p is for TexlanForward (Preview)

* Change which-key for +Latex

The which-key for +Latex has to be changed because `L` is already used
by +Lush.

With this commit the which-key for +Latex is changed to `t`.

* Add documentation of options

All configurable texlab option is documented in lv-config.example.lua.

Also a link to the documentation of the options from latex-lsp/texlab
is added.

1 files changed, 29 insertions, 0 deletions

diff --git a/lua/default-config.lua b/lua/default-config.lua
index b10c9590..a48e64a4 100644
--- a/lua/default-config.lua
+++ b/lua/default-config.lua
@@ -150,6 +150,35 @@ O = {
     },
     kotlin = {},
     latex = {
+      filetypes = { "tex", "bib"},
+      aux_directory = nil,
+      bibtex_formatter = "texlab",
+      diagnostics_delay = 300,
+      formatter_line_length = 80,
+      latex_formatter = "latexindent",
+      build = {
+        executable = "latexmk",
+        args = {'-pdf', '-interaction=nonstopmode', '-synctex=1', '%f'},
+        on_save = false,
+        forward_search_after = false,
+      },
+      chktex = {
+        on_open_and_save = false,
+        on_edit = false,
+      },
+      forward_search = {
+        executable = nil,
+        args = {}
+      },
+      latexindent = {
+        ["local"] = nil,
+        modify_line_breaks = false
+      },
+      diagnostics = {
+        virtual_text = {spacing = 0, prefix = ""},
+        signs = true,
+        underline = true,
+      },
       auto_save = false,
       ignore_errors = {},
     },