feat: add config to specify parser for filetypes

[davidatsurge]

Basically, this PR allows one to do:

require("tsht").config.ft_to_parser.typescriptreact = "tsx"

where, typescriptreact and tsx can be substituted for the appropriate filetype, and treesitter parser, respectively (like one can do in nvim-treesitter). This PR closes #17. I realize that another solution was proposed in #14, but was rejected because it added a dependency on nvim-treesitter. This PR avoids that.

Just thought I'd share how I'm working around the issue. If this PR is acceptable, I can modify the README with docs too.

[mfussenegger]

Looks good to me as a workaround

[cfbender]

Any update on this? After f1ffa06 I believe this should just be

diff --git a/lua/tsht.lua b/lua/tsht.lua
index 39f53d7..da10485 100644
--- a/lua/tsht.lua
+++ b/lua/tsht.lua
@@ -4,7 +4,7 @@ local api = vim.api
 local M = {}
 local ns = api.nvim_create_namespace('me.tsnode')

-M.config = {hint_keys = {}}
+M.config = {hint_keys = {}, ft_to_parser = {}}

 local function keys_iter()
   local i = 0
@@ -99,7 +99,9 @@ end


 local function get_parser(bufnr)
-  local ok, parser = pcall(vim.treesitter.get_parser, bufnr)
+  local filetype = api.nvim_buf_get_option(bufnr, 'filetype')
+  local resolved_filetype =  M.config.ft_to_parser[filetype]
+  local ok, parser = pcall(vim.treesitter.get_parser, bufnr, resolved_filetype)
   local err
   if ok then
     return parser

[mfussenegger]

See #30