More lsp support

This makes the LSP support complete for now:

- Completion
- Diagnostics
- Goto implementation/declaration
- Rename
- Documentation
- Find references

1 files changed, 129 insertions, 0 deletions

diff --git a/src/main/lsp/actions.c b/src/main/lsp/actions.c
new file mode 100644
index 0000000..ea792a1
--- /dev/null
+++ b/src/main/lsp/actions.c
@@ -0,0 +1,129 @@
+#include "actions.h"
+
+#include "dged/buffer.h"
+#include "dged/buffer_view.h"
+#include "dged/lsp.h"
+#include "dged/minibuffer.h"
+#include "dged/window.h"
+#include "main/lsp.h"
+#include "main/lsp/diagnostics.h"
+
+#include "choice-buffer.h"
+#include "types.h"
+
+static struct code_actions g_code_actions_result = {};
+
+static void code_action_command_selected(void *selected, void *userdata) {
+  struct lsp_server *server = (struct lsp_server *)userdata;
+  struct lsp_command *command = (struct lsp_command *)selected;
+  struct s8 json_payload = lsp_command_to_json(command);
+
+  uint64_t id = new_pending_request(server, NULL, NULL);
+  lsp_send(
+      lsp_backend(server),
+      lsp_create_request(id, s8("workspace/executeCommand"), json_payload));
+
+  s8delete(json_payload);
+}
+
+static void code_action_selected(void *selected, void *userdata) {
+  struct lsp_server *server = (struct lsp_server *)userdata;
+  struct code_action *action = (struct code_action *)selected;
+
+  if (action->has_edit) {
+    apply_edits(server, &action->edit);
+  }
+
+  if (action->has_command) {
+    struct s8 json_payload = lsp_command_to_json(&action->command);
+
+    uint64_t id = new_pending_request(server, NULL, NULL);
+    lsp_send(
+        lsp_backend(server),
+        lsp_create_request(id, s8("workspace/executeCommand"), json_payload));
+    s8delete(json_payload);
+  }
+}
+
+static void code_action_closed(void *userdata) {
+  (void)userdata;
+  lsp_code_actions_free(&g_code_actions_result);
+}
+
+static void handle_code_actions_response(struct lsp_server *server,
+                                         struct lsp_response *response,
+                                         void *userdata) {
+  struct code_actions actions =
+      lsp_code_actions_from_json(&response->value.result);
+
+  struct buffers *buffers = (struct buffers *)userdata;
+
+  if (VEC_SIZE(&actions.commands) == 0 &&
+      VEC_SIZE(&actions.code_actions) == 0) {
+    minibuffer_echo_timeout(4, "no code actions available");
+    lsp_code_actions_free(&actions);
+  } else {
+    g_code_actions_result = actions;
+    struct choice_buffer *buf =
+        choice_buffer_create(s8("Code Actions"), buffers, code_action_selected,
+                             code_action_closed, NULL, server);
+
+    VEC_FOR_EACH(&actions.code_actions, struct code_action * action) {
+      struct s8 line =
+          s8from_fmt("%.*s, (%.*s)", action->title.l, action->title.s,
+                     action->kind.l, action->kind.s);
+      choice_buffer_add_choice_with_callback(buf, line, action,
+                                             code_action_selected);
+      s8delete(line);
+    }
+
+    VEC_FOR_EACH(&actions.commands, struct lsp_command * command) {
+      struct s8 line = s8from_fmt("%.*s", command->title.l, command->title.s);
+      choice_buffer_add_choice_with_callback(buf, line, command,
+                                             code_action_command_selected);
+      s8delete(line);
+    }
+  }
+}
+
+int32_t code_actions_cmd(struct command_ctx ctx, int argc, const char **argv) {
+  (void)argc;
+  (void)argv;
+
+  struct buffer_view *bv = window_buffer_view(windows_get_active());
+
+  struct lsp_server *server = lsp_server_for_lang_id(bv->buffer->lang.id);
+  if (server == NULL) {
+    return 0;
+  }
+
+  uint64_t id =
+      new_pending_request(server, handle_code_actions_response, ctx.buffers);
+  struct versioned_text_document_identifier doc =
+      versioned_identifier_from_buffer(bv->buffer);
+  struct code_action_params params = {
+      .text_document.uri = doc.uri,
+      .range = region_new(bv->dot, bv->dot),
+  };
+
+  VEC_INIT(&params.context.diagnostics, 8);
+
+  diagnostic_vec *d =
+      diagnostics_for_buffer(lsp_server_diagnostics(server), bv->buffer);
+  if (d != NULL) {
+    VEC_FOR_EACH(d, struct diagnostic * diag) {
+      if (location_is_between(bv->dot, diag->region.begin, diag->region.end)) {
+        VEC_PUSH(&params.context.diagnostics, *diag);
+      }
+    }
+  }
+
+  struct s8 json_payload = code_action_params_to_json(&params);
+  lsp_send(lsp_backend(server),
+           lsp_create_request(id, s8("textDocument/codeAction"), json_payload));
+
+  VEC_DESTROY(&params.context.diagnostics);
+  versioned_text_document_identifier_free(&doc);
+  s8delete(json_payload);
+  return 0;
+}