#include <cfloat>
#include <cstdlib>
#include <cstring>
#include "BLI_listbase.h"
#include "BLI_utildefines.h"
#include "BLT_translation.hh"
#include "DNA_anim_types.h"
#include "DNA_key_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "RNA_access.hh"
#include "RNA_define.hh"
#include "RNA_prototypes.hh"
#include "BKE_action.hh"
#include "BKE_context.hh"
#include "BKE_key.hh"
#include "BKE_lib_id.hh"
#include "BKE_nla.hh"
#include "BKE_report.hh"
#include "BKE_scene.hh"
#include "ANIM_action.hh"
#include "ED_anim_api.hh"
#include "ED_screen.hh"
#include "DEG_depsgraph.hh"
#include "WM_api.hh"
#include "WM_types.hh"
#include "UI_interface_c.hh"
#include "action_intern.hh"

Functions
Utilities
AnimData *	ED_actedit_animdata_from_context (const bContext C, ID *r_adt_id_owner)
Create New Action
static bAction *	action_create_new (bContext C, bAction oldact)
New Action Operator
Criteria: 1) There must be an dope-sheet/action editor, and it must be in a mode which uses actions... OR The NLA Editor is active (i.e. Animation Data panel -> new action) 2) The associated AnimData block must not be in tweak-mode.
static bool	action_new_poll (bContext *C)
static wmOperatorStatus	action_new_exec (bContext C, wmOperator )
void	ACTION_OT_new (wmOperatorType *ot)
Action Push-Down Operator
Criteria: 1) There must be an dope-sheet/action editor, and it must be in a mode which uses actions. 2) There must be an action active. 3) The associated AnimData block must not be in tweak-mode.
static bool	action_pushdown_poll (bContext *C)
static wmOperatorStatus	action_pushdown_exec (bContext C, wmOperator )
void	ACTION_OT_push_down (wmOperatorType *ot)
Action Stash Operator
static wmOperatorStatus	action_stash_exec (bContext C, wmOperator op)
void	ACTION_OT_stash (wmOperatorType *ot)
Action Stash & Create Operator
Criteria: 1) There must be an dope-sheet/action editor, and it must be in a mode which uses actions. 2) The associated AnimData block must not be in tweak-mode.
static bool	action_stash_create_poll (bContext *C)
static wmOperatorStatus	action_stash_create_exec (bContext C, wmOperator op)
void	ACTION_OT_stash_and_create (wmOperatorType *ot)
Action Unlink Operator
We use a custom unlink operator here, as there are some technicalities which need special care: 1) When in Tweak Mode, it shouldn't be possible to unlink the active action, or else, everything turns to custard. 2) If the Action doesn't have any other users, the user should at least get a warning that it is going to get lost. 3) We need a convenient way to exit Tweak Mode from the Action Editor
void	ED_animedit_unlink_action (bContext C, ID id, AnimData adt, bAction act, ReportList *reports, bool force_delete)
static bool	action_unlink_poll (bContext *C)
static wmOperatorStatus	action_unlink_exec (bContext C, wmOperator op)
static wmOperatorStatus	action_unlink_invoke (bContext C, wmOperator op, const wmEvent *event)
void	ACTION_OT_unlink (wmOperatorType *ot)