Completion rework

- Add support for building with clang

Also fix some annoying bugs:

- Visual column was wrong when using tabs
- Add shift-tab for inserting an actual tab
- Fix minibuffer sometimes having dot above it

1 files changed, 83 insertions, 0 deletions

diff --git a/src/main/completion.h b/src/main/completion.h
new file mode 100644
index 0000000..751d152
--- /dev/null
+++ b/src/main/completion.h
@@ -0,0 +1,83 @@
+#ifndef _COMPLETION_H
+#define _COMPLETION_H
+
+#include "dged/location.h"
+
+struct buffer;
+struct buffers;
+
+struct completion {
+  const char *display;
+  const char *insert;
+  bool complete;
+};
+
+struct completion_context {
+  struct buffer *buffer;
+  const struct location location;
+  const uint32_t max_ncompletions;
+  struct completion *completions;
+};
+
+typedef uint32_t (*completion_fn)(struct completion_context ctx,
+                                  void *userdata);
+
+struct completion_provider {
+  char name[16];
+  completion_fn complete;
+  void *userdata;
+};
+
+enum completion_trigger_kind {
+  CompletionTrigger_Input = 0,
+  CompletionTrigger_Char = 1,
+};
+
+struct completion_trigger {
+  enum completion_trigger_kind kind;
+  union {
+    uint32_t c;
+    uint32_t nchars;
+  };
+};
+
+void init_completion(struct buffers *buffers);
+void destroy_completion();
+
+typedef void (*insert_cb)();
+
+/**
+ * Enable completions in the buffer @ref source.
+ *
+ * @param source [in] The buffer to provide completions for.
+ * @param trigger [in] The completion trigger to use for this completion.
+ * @param providers [in] The completion providers to use.
+ * @param nproviders [in] The number of providers in @ref providers.
+ */
+void enable_completion(struct buffer *source, struct completion_trigger trigger,
+                       struct completion_provider *providers,
+                       uint32_t nproviders, insert_cb on_completion_inserted);
+
+struct completion_provider path_provider();
+struct completion_provider buffer_provider();
+
+/**
+ * Abort any active completion.
+ */
+void abort_completion();
+
+/**
+ * Is a completion currently showing?
+ *
+ * @returns True if the completion window is showing completions.
+ */
+bool completion_active();
+
+/**
+ * Disable completion for @ref buffer.
+ *
+ * @param buffer [in] Buffer to disable completions for.
+ */
+void disable_completion(struct buffer *buffer);
+
+#endif