From 1d8b5da24db92f9598cd6aeb59d283ae39024349 Mon Sep 17 00:00:00 2001
From: Albert Cervin <albert@acervin.com>
Date: Tue, 9 May 2023 13:38:21 +0200
Subject: Start of buflist implementation

---
 src/dged/buffers.c  |  5 +++++
 src/dged/buffers.h  |  2 ++
 src/main/bindings.c |  1 +
 src/main/cmds.c     | 34 ++++++++++++++++++++++++++++++++++
 4 files changed, 42 insertions(+)

diff --git a/src/dged/buffers.c b/src/dged/buffers.c
index aa6bcea..265a248 100644
--- a/src/dged/buffers.c
+++ b/src/dged/buffers.c
@@ -52,6 +52,11 @@ struct buffer *buffers_find_by_filename(struct buffers *buffers,
   return NULL;
 }
 
+void buffers_for_each(struct buffers *buffers, buffers_hook_cb callback,
+                      void *userdata) {
+  VEC_FOR_EACH(&buffers->buffers, struct buffer * b) { callback(b, userdata); }
+}
+
 void buffers_destroy(struct buffers *buffers) {
   VEC_FOR_EACH(&buffers->buffers, struct buffer * b) { buffer_destroy(b); }
 
diff --git a/src/dged/buffers.h b/src/dged/buffers.h
index 8add8d8..cb37fcb 100644
--- a/src/dged/buffers.h
+++ b/src/dged/buffers.h
@@ -25,4 +25,6 @@ struct buffer *buffers_find_by_filename(struct buffers *buffers, const char *pat
 uint32_t buffers_add_add_hook(struct buffers *buffers, buffers_hook_cb callback, void *userdata);
 uint32_t buffers_add_remove_hook(struct buffers *buffers, buffers_hook_cb callback, void *userdata);
 
+void buffers_for_each(struct buffers *buffers, buffers_hook_cb callback, void *userdata);
+
 void buffers_destroy(struct buffers *buffers);
diff --git a/src/main/bindings.c b/src/main/bindings.c
index 7ea75eb..ec608fd 100644
--- a/src/main/bindings.c
+++ b/src/main/bindings.c
@@ -83,6 +83,7 @@ struct keymap *register_bindings() {
       BINDING(Ctrl, 'F', "find-file"),
       BINDING(Ctrl, 'W', "write-file"),
       BINDING(None, 'b', "switch-buffer"),
+      BINDING(Ctrl, 'B', "buffer-list"),
 
       BINDING(None, '0', "window-close"),
       BINDING(None, '1', "window-close-others"),
diff --git a/src/main/cmds.c b/src/main/cmds.c
index 4cbb00f..63a7e01 100644
--- a/src/main/cmds.c
+++ b/src/main/cmds.c
@@ -269,6 +269,39 @@ int32_t timers(struct command_ctx ctx, int argc, const char *argv[]) {
   return 0;
 }
 
+void buffer_to_list_line(struct buffer *buffer, void *userdata) {
+  struct buffer_view *listbuf = (struct buffer_view *)userdata;
+  char buf[1024];
+  size_t written = snprintf(buf, 1024, "%-16s %s\n", buffer->name,
+                            buffer->filename != NULL ? buffer->filename : "<no-file>");
+
+  if (written > 0) {
+    buffer_add_text(listbuf, (uint8_t *)buf, written);
+  }
+}
+
+int32_t buffer_list(struct command_ctx ctx, int argc, const char *argv[]) {
+  struct buffer *b = buffers_find(ctx.buffers, "buffers");
+  if (b == NULL) {
+    b = buffers_add(ctx.buffers, buffer_create("buffers"));
+  }
+
+  struct window *new_window_a, *new_window_b;
+  window_split(ctx.active_window, &new_window_a, &new_window_b);
+
+  window_set_buffer(new_window_b, b);
+
+  struct buffer_view *bv = window_buffer_view(new_window_b);
+  buffer_set_readonly(b, false);
+  buffer_clear(bv);
+  buffers_for_each(ctx.buffers, buffer_to_list_line, bv);
+
+  buffer_goto_beginning(bv);
+  buffer_set_readonly(b, true);
+
+  return 0;
+}
+
 void register_global_commands(struct commands *commands,
                               void (*terminate_cb)()) {
 
@@ -281,6 +314,7 @@ void register_global_commands(struct commands *commands,
       {.name = "find-next", .fn = find, .userdata = "forward"},
       {.name = "find-prev", .fn = find, .userdata = "backward"},
       {.name = "timers", .fn = timers},
+      {.name = "buffer-list", .fn = buffer_list},
       {.name = "exit", .fn = exit_editor, .userdata = terminate_cb}};
 
   register_commands(commands, global_commands,
-- 
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