gdb: Add gdb configuration based on gdb-dashboard

For the most part adapted from
https://gavinhoward.com/2020/12/my-development-environment-and-how-i-got-there/

Also contains support for opening current line in neovim.

This assumes we are running inside neovim terminal and hence the use of
nvr viz. neovim-remote. We will try adding support for kitty window and
single instances later if possible.

gdb/.gdbinit.d/auto

@@ -0,0 +1,19 @@
+dashboard -enabled on
+dashboard -layout breakpoints variables source stack threads
+dashboard -style prompt 'gdb>'
+dashboard -style max_value_length 0
+dashboard variables -style compact True
+dashboard variables -style align True
+dashboard variables -style sort True
+dashboard expressions -style align True
+dashboard stack -style sort True
+
+define expand
+    dashboard -style compact_values False
+end
+
+define pack
+    dashboard -style compact_values True
+end
+
+expand

gdb/.gdbinit.d/hooks

@@ -0,0 +1,67 @@
+define hookpost-up
+    dashboard
+end
+
+define hookpost-down
+    dashboard
+end
+
+define hookpost-frame
+    dashboard
+end
+
+define hookpost-finish
+    dashboard
+end
+
+define hookpost-return
+    dashboard
+end
+
+define hook-quit
+    set confirm off
+end
+
+define hookpost-enable
+    dashboard
+end
+
+define hookpost-disable
+    dashboard
+end
+
+define hookpost-break
+    dashboard
+end
+
+define hookpost-tbreak
+    dashboard
+end
+
+define hookpost-delete
+    dashboard
+end
+
+define hookpost-watch
+    dashboard
+end
+
+define hookpost-rwatch
+    dashboard
+end
+
+define hookpost-awatch
+    dashboard
+end
+
+define hookpost-condition
+    dashboard
+end
+
+define hookpost-core-file
+    dashboard
+end
+
+define hookpost-thread
+    dashboard
+end

gdb/.gdbinit.d/init

@@ -0,0 +1,17 @@
+set confirm off
+set breakpoint pending on
+set print pretty on
+set auto-load safe-path /
+set logging off
+
+# Adapted to use neovim from https://github.com/cyrus-and/gdb-dashboard/issues/20
+define vo
+python
+import os
+sal = gdb.selected_frame().find_sal()
+current_line = sal.line
+if current_line != 0:
+    openInNvim = "nvr +" + str(current_line) + " " + sal.symtab.fullname()
+    os.system(openInNvim)
+end
+end