From 157a2d51727808038657c498410524f607d1292f Mon Sep 17 00:00:00 2001
From: "Alexandre Cavalheiro S. Tiago da Silva" <contact@thewizard.link>
Date: Thu, 13 Feb 2025 13:01:39 -0300
Subject: [PATCH] feat(neovim): add csharp ftplugin to aid on nvim-dap

---
 .../home-manager/programs/neovim/default.nix  |   5 +
 .../programs/neovim/ftplugin/cs.lua           | 137 ++++++++++++++++++
 2 files changed, 142 insertions(+)
 create mode 100644 modules/home-manager/programs/neovim/ftplugin/cs.lua

diff --git a/modules/home-manager/programs/neovim/default.nix b/modules/home-manager/programs/neovim/default.nix
index 0cf20ce..79db868 100644
--- a/modules/home-manager/programs/neovim/default.nix
+++ b/modules/home-manager/programs/neovim/default.nix
@@ -143,6 +143,11 @@ in
       source = ./queries;
     };
 
+    xdg.configFile."nvim/ftplugin" = {
+      recursive = true;
+      source = ./ftplugin;
+    };
+
     xdg.configFile."nvim/lua/plugins/astrolsp.lua".source = pkgs.runCommand "astrolsp.lua" { } ''
       cp ${./lsp.lua} $out
 
diff --git a/modules/home-manager/programs/neovim/ftplugin/cs.lua b/modules/home-manager/programs/neovim/ftplugin/cs.lua
new file mode 100644
index 0000000..3b69f26
--- /dev/null
+++ b/modules/home-manager/programs/neovim/ftplugin/cs.lua
@@ -0,0 +1,137 @@
+---@class CSFTPlugin.Project
+---@field dll_path string
+---@field name string
+---@field target_framework string
+
+---@class CSFTPlugin
+---@field dotnet_cmd string?
+---@field projects CSFTPlugin.Project[]
+local M = {
+  dotnet_cmd = vim.fn.exepath "dotnet",
+  projects = {},
+}
+
+---@param command string The shell command to execute
+---@return string[]
+function M.cmd(command)
+  -- execute command
+  local exec_return = vim.fn.execute("!" .. command)
+
+  -- get the output by line
+  local output = vim.tbl_filter(
+  ---@param item string
+  ---@return boolean
+    function(item)
+      if item == "" then
+        return false
+      else
+        return true
+      end
+    end,
+    vim.split(exec_return, "[\n]")
+  )
+
+  -- remove echo line (":!<command>")
+  table.remove(output, 1)
+
+  return output
+end
+
+---@return CSFTPlugin.Project[]
+function M.find_projects()
+  local projects = {}
+
+  local csproj_extension = ".csproj"
+
+  local csproj_files = M.cmd("find . -name '*" .. csproj_extension .. "'")
+
+  for _, file_path in ipairs(csproj_files) do
+    local sub_start, sub_end = string.find(file_path, "%w+%" .. csproj_extension)
+
+    local project_name = string.sub(file_path, sub_start or 1, sub_end - #csproj_extension)
+    local project_location = string.sub(file_path, 1, sub_start - 1)
+
+    local target_framework = M.cmd("rg -e 'TargetFramework>(.*)<' -r '$1' -o " .. file_path)[1]
+
+    projects[#projects + 1] = {
+      dll_path = project_location .. "bin/Debug/" .. target_framework .. "/" .. project_name .. ".dll",
+      name = project_name,
+      target_framework = target_framework,
+    }
+  end
+
+  return projects
+end
+
+---@param command string The dotnet CLI command to run
+---@return string[]
+function M:run(command)
+  return M.cmd(self.dotnet_cmd .. " " .. command)
+end
+
+---@return boolean
+function M:check_version()
+  local cmd_output = self:run "--version"
+
+  local sub_start = string.find(cmd_output[1], "%d+%.%d+%.%d+")
+  if not sub_start then
+    return false
+  end
+
+  return true
+end
+
+---@return thread
+function M:choose_dll()
+  return coroutine.create(function(search_coroutine)
+    vim.ui.select(
+      self.projects,
+      {
+        prompt = "Select project to debug:",
+        ---@param item CSFTPlugin.Project
+        ---@return string
+        format_item = function(item)
+          return item.name
+        end,
+      },
+      ---@param item CSFTPlugin.Project
+      function(item)
+        self:run "build"
+
+        coroutine.resume(search_coroutine, item and item.dll_path or require("dap").ABORT)
+      end
+    )
+  end)
+end
+
+function M:start()
+  local has_dotnet = self:check_version()
+
+  if not has_dotnet then
+    vim.notify_once("dotnet executable not present of malfunctioning", vim.log.levels.ERROR)
+    return
+  end
+
+  self.projects = self.find_projects()
+
+  local dap = require "dap"
+
+  dap.configurations.cs = {
+    {
+      type = "netcoredbg",
+      name = "Launch project DLL",
+      request = "launch",
+      program = function()
+        return self:choose_dll()
+      end,
+    },
+  }
+
+  vim.notify_once("Loaded projects for nvim-dap", vim.log.levels.INFO)
+
+  vim.g.loaded_csftplugin = true
+end
+
+if not vim.g.loaded_csftplugin then
+  M:start()
+end