Feat: symbols json picker (#303)

README.md

@@ -391,6 +391,7 @@ Built-in function ready to be bound to any key you like :smile:.
 | `builtin.git_bcommits`              | Lists buffer's git commits with diff preview and checkouts it out on enter.                 |
 | `builtin.git_branches`              | Lists all branches with log preview and checkout action.                                    |
 | `builtin.git_status`                | Lists current changes per file with diff preview and add action. (Multiselection still WIP) |
+| `builtin.symbols`                   | Lists symbols inside a file `data/telescope-sources/*.json` found in your rtp. More info and symbol sources can be found [here](https://github.com/nvim-telescope/telescope-symbols.nvim) |
 | ..................................  | Your next awesome finder function here :D                                                   |
 
 #### Built-in Previewers

lua/telescope/actions/init.lua

@@ -230,6 +230,12 @@ actions.run_builtin = function(prompt_bufnr)
   require('telescope.builtin')[entry.text]()
 end
 
+actions.insert_symbol = function(prompt_bufnr)
+  local selection = actions.get_selected_entry()
+  actions.close(prompt_bufnr)
+  vim.api.nvim_put({selection.value[1]}, '', true, true)
+end
+
 -- TODO: Think about how to do this.
 actions.insert_value = function(prompt_bufnr)
   local entry = actions.get_selected_entry(prompt_bufnr)

lua/telescope/builtin/init.lua

@@ -36,6 +36,7 @@ builtin.git_status = require('telescope.builtin.git').status
 
 builtin.builtin = require('telescope.builtin.internal').builtin
 builtin.planets = require('telescope.builtin.internal').planets
+builtin.symbols = require('telescope.builtin.internal').symbols
 builtin.commands = require('telescope.builtin.internal').commands
 builtin.quickfix = require('telescope.builtin.internal').quickfix
 builtin.loclist = require('telescope.builtin.internal').loclist

lua/telescope/builtin/internal.lua

@@ -86,6 +86,55 @@ internal.planets = function(opts)
   }:find()
 end
 
+internal.symbols = function(opts)
+  local files = vim.api.nvim_get_runtime_file('data/telescope-sources/*.json', true)
+  if table.getn(files) == 0 then
+    print("No sources found! Check out https://github.com/nvim-telescope/telescope-symbols.nvim " ..
+          "for some prebuild symbols or how to create you own symbol source.")
+    return
+  end
+
+  local sources = {}
+  if opts.sources then
+    for _, v in ipairs(files) do
+      for _, s in ipairs(opts.sources) do
+        if v:find(s) then
+          table.insert(sources, v)
+        end
+      end
+    end
+  else
+    sources = files
+  end
+
+  local results = {}
+  for _, source in ipairs(sources) do
+    local data = vim.fn.json_decode(path.read_file(source))
+    for _, entry in ipairs(data) do
+      table.insert(results, entry)
+    end
+  end
+
+  pickers.new(opts, {
+    prompt_title = 'Symbols',
+    finder    = finders.new_table {
+      results     = results,
+      entry_maker = function(entry)
+        return {
+          value = entry,
+          ordinal = entry[1] .. ' ' .. entry[2],
+          display = entry[1] .. ' ' .. entry[2],
+        }
+      end
+    },
+    sorter = conf.generic_sorter(opts),
+    attach_mappings = function(_)
+      actions.goto_file_selection_edit:replace(actions.insert_symbol)
+      return true
+    end
+  }):find()
+end
+
 internal.commands = function(opts)
   pickers.new(opts, {
     prompt_title = 'Commands',