From 284e59d608a90589956780fe1dd81ecc2ba11362 Mon Sep 17 00:00:00 2001
From: Bastien Montagne <montagne29@wanadoo.fr>
Date: Fri, 15 Mar 2013 14:32:29 +0000
Subject: Add the possibility to define the translation context for py rna
 classes (operators, panels and menus).

Thanks to Campell and Brecht for the reviews!
---
 source/blender/blenfont/BLF_translation.h          |  2 +
 source/blender/blenfont/intern/blf_translation.c   |  2 +-
 source/blender/blenkernel/BKE_screen.h             | 10 +++--
 .../blender/editors/interface/interface_layout.c   |  2 +-
 source/blender/editors/interface/interface_panel.c |  4 +-
 source/blender/makesrna/intern/rna_ui.c            | 21 +++++++++-
 source/blender/makesrna/intern/rna_wm.c            | 49 ++++++++++++++++++++--
 source/blender/python/intern/bpy_operator_wrap.c   | 10 +++++
 source/blender/python/intern/bpy_rna.c             |  2 +-
 source/blender/windowmanager/WM_types.h            |  1 +
 source/blender/windowmanager/intern/wm_operators.c |  4 +-
 11 files changed, 92 insertions(+), 15 deletions(-)

(limited to 'source')

diff --git a/source/blender/blenfont/BLF_translation.h b/source/blender/blenfont/BLF_translation.h
index 2f40cc3f571..db449995b8f 100644
--- a/source/blender/blenfont/BLF_translation.h
+++ b/source/blender/blenfont/BLF_translation.h
@@ -110,12 +110,14 @@ const char *BLF_translate_do_tooltip(const char *msgctxt, const char *msgid);
  * All i18n contexts must be defined here.
  * This is a nice way to be sure not to use a context twice for different
  * things, and limit the number of existing contexts!
+ * WARNING! Contexts should not be longer than BKE_ST_MAXNAME - 1!
  */
 
 /* Default, void context.
  * WARNING! The "" context is not the same as no (NULL) context at mo/boost::locale level!
  * NOTE: We translate BLF_I18NCONTEXT_DEFAULT as BLF_I18NCONTEXT_DEFAULT_BPY in Python, as we can't use "natural"
  *       None value in rna string properties... :/
+ *       The void string "" is also interpreted as BLF_I18NCONTEXT_DEFAULT.
  *       For perf reason, we only use the first char to detect this context, so other contexts should never start
  *       with the same char!
  */
diff --git a/source/blender/blenfont/intern/blf_translation.c b/source/blender/blenfont/intern/blf_translation.c
index 2483c59d3ec..4e9408c512a 100644
--- a/source/blender/blenfont/intern/blf_translation.c
+++ b/source/blender/blenfont/intern/blf_translation.c
@@ -132,7 +132,7 @@ const char *BLF_pgettext(const char *msgctxt, const char *msgid)
 
 	if (msgid && msgid[0]) {
 		/*if (msgctxt && !strcmp(msgctxt, BLF_I18NCONTEXT_DEFAULT_BPY_INTERN)) { */
-		if (msgctxt && msgctxt[0] == BLF_I18NCONTEXT_DEFAULT_BPY[0]) {
+		if (msgctxt && (!msgctxt[0] || msgctxt[0] == BLF_I18NCONTEXT_DEFAULT_BPY[0])) {
 			/* BLF_I18NCONTEXT_DEFAULT_BPY context is reserved and considered the same as default NULL one. */
 			msgctxt = BLF_I18NCONTEXT_DEFAULT;
 		}
diff --git a/source/blender/blenkernel/BKE_screen.h b/source/blender/blenkernel/BKE_screen.h
index 629acab9e34..f1a169c4fac 100644
--- a/source/blender/blenkernel/BKE_screen.h
+++ b/source/blender/blenkernel/BKE_screen.h
@@ -163,9 +163,10 @@ typedef struct ARegionType {
 typedef struct PanelType {
 	struct PanelType *next, *prev;
 	
-	char idname[BKE_ST_MAXNAME];            /* unique name */
-	char label[BKE_ST_MAXNAME];             /* for panel header */
-	char context[BKE_ST_MAXNAME];           /* for buttons window */
+	char idname[BKE_ST_MAXNAME];              /* unique name */
+	char label[BKE_ST_MAXNAME];               /* for panel header */
+	char translation_context[BKE_ST_MAXNAME];
+	char context[BKE_ST_MAXNAME];             /* for buttons window */
 	int space_type;
 	int region_type;
 
@@ -227,7 +228,8 @@ typedef struct MenuType {
 
 	char idname[BKE_ST_MAXNAME];        /* unique name */
 	char label[BKE_ST_MAXNAME];         /* for button text */
-	char       *description;
+	char translation_context[BKE_ST_MAXNAME];
+	char *description;
 
 	/* verify if the menu should draw or not */
 	int (*poll)(const struct bContext *, struct MenuType *);
diff --git a/source/blender/editors/interface/interface_layout.c b/source/blender/editors/interface/interface_layout.c
index 1e95b4df762..ea6ecadd924 100644
--- a/source/blender/editors/interface/interface_layout.c
+++ b/source/blender/editors/interface/interface_layout.c
@@ -1567,7 +1567,7 @@ void uiItemM(uiLayout *layout, bContext *UNUSED(C), const char *menuname, const
 	}
 
 	if (!name) {
-		name = IFACE_(mt->label);
+		name = CTX_IFACE_(mt->translation_context, mt->label);
 	}
 
 	if (layout->root->type == UI_LAYOUT_MENU && !icon)
diff --git a/source/blender/editors/interface/interface_panel.c b/source/blender/editors/interface/interface_panel.c
index e466c481151..a741ea432a5 100644
--- a/source/blender/editors/interface/interface_panel.c
+++ b/source/blender/editors/interface/interface_panel.c
@@ -191,7 +191,7 @@ static void ui_panel_copy_offset(Panel *pa, Panel *papar)
 Panel *uiBeginPanel(ScrArea *sa, ARegion *ar, uiBlock *block, PanelType *pt, int *open)
 {
 	Panel *pa, *patab, *palast, *panext;
-	char *drawname = pt->label;
+	const char *drawname = CTX_IFACE_(pt->translation_context, pt->label);
 	char *idname = pt->idname;
 	char *tabname = pt->idname;
 	char *hookname = NULL;
@@ -469,7 +469,7 @@ static void ui_draw_aligned_panel_header(uiStyle *style, uiBlock *block, rcti *r
 	Panel *panel = block->panel;
 	rcti hrect;
 	int pnl_icons;
-	const char *activename = IFACE_(panel->drawname[0] ? panel->drawname : panel->panelname);
+	const char *activename = panel->drawname[0] ? panel->drawname : panel->panelname;
 
 	/* + 0.001f to avoid flirting with float inaccuracy */
 	if (panel->control & UI_PNL_CLOSE) pnl_icons = (panel->labelofs + 2 * PNL_ICON + 5) / block->aspect + 0.001f;
diff --git a/source/blender/makesrna/intern/rna_ui.c b/source/blender/makesrna/intern/rna_ui.c
index e5585b4f72d..05056574a71 100644
--- a/source/blender/makesrna/intern/rna_ui.c
+++ b/source/blender/makesrna/intern/rna_ui.c
@@ -29,6 +29,8 @@
 
 #include "DNA_screen_types.h"
 
+#include "BLF_translation.h"
+
 #include "RNA_define.h"
 
 #include "rna_internal.h"
@@ -226,6 +228,7 @@ static StructRNA *rna_Panel_register(Main *bmain, ReportList *reports, void *dat
 	memcpy(pt, &dummypt, sizeof(dummypt));
 
 	pt->ext.srna = RNA_def_struct_ptr(&BLENDER_RNA, pt->idname, &RNA_Panel);
+	RNA_def_struct_translation_context(pt->ext.srna, pt->translation_context);
 	pt->ext.data = data;
 	pt->ext.call = call;
 	pt->ext.free = free;
@@ -573,6 +576,7 @@ static StructRNA *rna_Menu_register(Main *bmain, ReportList *reports, void *data
 	}
 
 	mt->ext.srna = RNA_def_struct_ptr(&BLENDER_RNA, mt->idname, &RNA_Menu);
+	RNA_def_struct_translation_context(mt->ext.srna, mt->translation_context);
 	mt->ext.data = data;
 	mt->ext.call = call;
 	mt->ext.free = free;
@@ -773,6 +777,7 @@ static void rna_def_panel(BlenderRNA *brna)
 	RNA_def_struct_sdna(srna, "Panel");
 	RNA_def_struct_refine_func(srna, "rna_Panel_refine");
 	RNA_def_struct_register_funcs(srna, "rna_Panel_register", "rna_Panel_unregister", NULL);
+	RNA_def_struct_translation_context(srna, BLF_I18NCONTEXT_DEFAULT);
 
 	/* poll */
 	func = RNA_def_function(srna, "poll", NULL);
@@ -819,7 +824,13 @@ static void rna_def_panel(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Label",
 	                         "The panel label, shows up in the panel header at the right of the "
 	                         "triangle used to collapse the panel");
-	
+
+	prop = RNA_def_property(srna, "bl_translation_context", PROP_STRING, PROP_NONE);
+	RNA_def_property_string_sdna(prop, NULL, "type->translation_context");
+	RNA_def_property_string_default(prop, BLF_I18NCONTEXT_DEFAULT);
+	RNA_def_property_flag(prop, PROP_REGISTER_OPTIONAL);
+	RNA_define_verify_sdna(TRUE);
+
 	prop = RNA_def_property(srna, "bl_space_type", PROP_ENUM, PROP_NONE);
 	RNA_def_property_enum_sdna(prop, NULL, "type->space_type");
 	RNA_def_property_enum_items(prop, space_type_items);
@@ -956,6 +967,7 @@ static void rna_def_menu(BlenderRNA *brna)
 	RNA_def_struct_sdna(srna, "Menu");
 	RNA_def_struct_refine_func(srna, "rna_Menu_refine");
 	RNA_def_struct_register_funcs(srna, "rna_Menu_register", "rna_Menu_unregister", NULL);
+	RNA_def_struct_translation_context(srna, BLF_I18NCONTEXT_DEFAULT);
 
 	/* poll */
 	func = RNA_def_function(srna, "poll", NULL);
@@ -972,7 +984,7 @@ static void rna_def_menu(BlenderRNA *brna)
 	parm = RNA_def_pointer(func, "context", "Context", "", "");
 	RNA_def_property_flag(parm, PROP_REQUIRED);
 
-	RNA_define_verify_sdna(0); /* not in sdna */
+	RNA_define_verify_sdna(FALSE); /* not in sdna */
 
 	prop = RNA_def_property(srna, "layout", PROP_POINTER, PROP_NONE);
 	RNA_def_property_pointer_sdna(prop, NULL, "layout");
@@ -994,6 +1006,11 @@ static void rna_def_menu(BlenderRNA *brna)
 	RNA_def_property_flag(prop, PROP_REGISTER);
 	RNA_def_property_ui_text(prop, "Label", "The menu label");
 
+	prop = RNA_def_property(srna, "bl_translation_context", PROP_STRING, PROP_NONE);
+	RNA_def_property_string_sdna(prop, NULL, "type->translation_context");
+	RNA_def_property_string_default(prop, BLF_I18NCONTEXT_DEFAULT);
+	RNA_def_property_flag(prop, PROP_REGISTER_OPTIONAL);
+
 	prop = RNA_def_property(srna, "bl_description", PROP_STRING, PROP_NONE);
 	RNA_def_property_string_sdna(prop, NULL, "type->description");
 	RNA_def_property_string_maxlength(prop, RNA_DYN_DESCR_MAX); /* else it uses the pointer size! */
diff --git a/source/blender/makesrna/intern/rna_wm.c b/source/blender/makesrna/intern/rna_wm.c
index 9a160d8bb1e..0dd95d17260 100644
--- a/source/blender/makesrna/intern/rna_wm.c
+++ b/source/blender/makesrna/intern/rna_wm.c
@@ -33,6 +33,8 @@
 
 #include "BLI_utildefines.h"
 
+#include "BLF_translation.h"
+
 #include "RNA_access.h"
 #include "RNA_define.h"
 #include "RNA_enum_types.h"
@@ -1050,6 +1052,7 @@ void macro_wrapper(wmOperatorType *ot, void *userdata);
 static char _operator_idname[OP_MAX_TYPENAME];
 static char _operator_name[OP_MAX_TYPENAME];
 static char _operator_descr[RNA_DYN_DESCR_MAX];
+static char _operator_ctxt[RNA_DYN_DESCR_MAX];
 static StructRNA *rna_Operator_register(Main *bmain, ReportList *reports, void *data, const char *identifier,
                                         StructValidateFunc validate, StructCallbackFunc call, StructFreeFunc free)
 {
@@ -1063,10 +1066,11 @@ static StructRNA *rna_Operator_register(Main *bmain, ReportList *reports, void *
 	dummyot.idname = _operator_idname; /* only assigne the pointer, string is NULL'd */
 	dummyot.name = _operator_name; /* only assigne the pointer, string is NULL'd */
 	dummyot.description = _operator_descr; /* only assigne the pointer, string is NULL'd */
+	dummyot.translation_context = _operator_ctxt; /* only assigne the pointer, string is NULL'd */
 	RNA_pointer_create(NULL, &RNA_Operator, &dummyop, &dummyotr);
 
 	/* clear in case they are left unset */
-	_operator_idname[0] = _operator_name[0] = _operator_descr[0] = '\0';
+	_operator_idname[0] = _operator_name[0] = _operator_descr[0] = _operator_ctxt[0] = '\0';
 
 	/* validate the python class */
 	if (validate(&dummyotr, data, have_function) != 0)
@@ -1117,9 +1121,10 @@ static StructRNA *rna_Operator_register(Main *bmain, ReportList *reports, void *
 			int idlen = strlen(_operator_idname) + 4;
 			int namelen = strlen(_operator_name) + 1;
 			int desclen = strlen(_operator_descr) + 1;
+			int ctxtlen = strlen(_operator_ctxt) + 1;
 			char *ch;
 			/* 2 terminators and 3 to convert a.b -> A_OT_b */
-			ch = MEM_callocN(sizeof(char) * (idlen + namelen + desclen), "_operator_idname");
+			ch = MEM_callocN(sizeof(char) * (idlen + namelen + desclen + ctxtlen), "_operator_idname");
 			WM_operator_bl_idname(ch, _operator_idname); /* convert the idname from python */
 			dummyot.idname = ch;
 			ch += idlen;
@@ -1128,6 +1133,9 @@ static StructRNA *rna_Operator_register(Main *bmain, ReportList *reports, void *
 			ch += namelen;
 			strcpy(ch, _operator_descr);
 			dummyot.description = ch;
+			ch += desclen;
+			strcpy(ch, _operator_ctxt);
+			dummyot.translation_context = ch;
 		}
 	}
 
@@ -1144,6 +1152,7 @@ static StructRNA *rna_Operator_register(Main *bmain, ReportList *reports, void *
 	/* create a new operator type */
 	dummyot.ext.srna = RNA_def_struct_ptr(&BLENDER_RNA, dummyot.idname, &RNA_Operator);
 	RNA_def_struct_flag(dummyot.ext.srna, STRUCT_NO_IDPROPERTIES); /* operator properties are registered separately */
+	RNA_def_struct_translation_context(dummyot.ext.srna, dummyot.translation_context);
 	dummyot.ext.data = data;
 	dummyot.ext.call = call;
 	dummyot.ext.free = free;
@@ -1182,6 +1191,7 @@ static StructRNA *rna_MacroOperator_register(Main *bmain, ReportList *reports, v
 	dummyot.idname = _operator_idname; /* only assigne the pointer, string is NULL'd */
 	dummyot.name = _operator_name; /* only assigne the pointer, string is NULL'd */
 	dummyot.description = _operator_descr; /* only assigne the pointer, string is NULL'd */
+	dummyot.translation_context = _operator_ctxt; /* only assigne the pointer, string is NULL'd */
 	RNA_pointer_create(NULL, &RNA_Macro, &dummyop, &dummyotr);
 
 	/* validate the python class */
@@ -1193,9 +1203,10 @@ static StructRNA *rna_MacroOperator_register(Main *bmain, ReportList *reports, v
 		int idlen = strlen(_operator_idname) + 4;
 		int namelen = strlen(_operator_name) + 1;
 		int desclen = strlen(_operator_descr) + 1;
+		int ctxtlen = strlen(_operator_ctxt) + 1;
 		char *ch;
 		/* 2 terminators and 3 to convert a.b -> A_OT_b */
-		ch = MEM_callocN(sizeof(char) * (idlen + namelen + desclen), "_operator_idname");
+		ch = MEM_callocN(sizeof(char) * (idlen + namelen + desclen + ctxtlen), "_operator_idname");
 		WM_operator_bl_idname(ch, _operator_idname); /* convert the idname from python */
 		dummyot.idname = ch;
 		ch += idlen;
@@ -1204,6 +1215,9 @@ static StructRNA *rna_MacroOperator_register(Main *bmain, ReportList *reports, v
 		ch += namelen;
 		strcpy(ch, _operator_descr);
 		dummyot.description = ch;
+		ch += desclen;
+		strcpy(ch, _operator_ctxt);
+		dummyot.translation_context = ch;
 	}
 
 	if (strlen(identifier) >= sizeof(dummyop.idname)) {
@@ -1224,6 +1238,7 @@ static StructRNA *rna_MacroOperator_register(Main *bmain, ReportList *reports, v
 
 	/* create a new operator type */
 	dummyot.ext.srna = RNA_def_struct_ptr(&BLENDER_RNA, dummyot.idname, &RNA_Operator);
+	RNA_def_struct_translation_context(dummyot.ext.srna, dummyot.translation_context);
 	dummyot.ext.data = data;
 	dummyot.ext.call = call;
 	dummyot.ext.free = free;
@@ -1273,6 +1288,16 @@ static void rna_Operator_bl_label_set(PointerRNA *ptr, const char *value)
 		assert(!"setting the bl_label on a non-builtin operator");
 }
 
+static void rna_Operator_bl_translation_context_set(PointerRNA *ptr, const char *value)
+{
+	wmOperator *data = (wmOperator *)(ptr->data);
+	char *str = (char *)data->type->translation_context;
+	if (!str[0])
+		BLI_strncpy(str, value, RNA_DYN_DESCR_MAX);    /* utf8 already ensured */
+	else
+		assert(!"setting the bl_translation_context on a non-builtin operator");
+}
+
 static void rna_Operator_bl_description_set(PointerRNA *ptr, const char *value)
 {
 	wmOperator *data = (wmOperator *)(ptr->data);
@@ -1303,6 +1328,7 @@ static void rna_def_operator(BlenderRNA *brna)
 #ifdef WITH_PYTHON
 	RNA_def_struct_register_funcs(srna, "rna_Operator_register", "rna_Operator_unregister", "rna_Operator_instance");
 #endif
+	RNA_def_struct_translation_context(srna, BLF_I18NCONTEXT_OPERATOR_DEFAULT);
 
 	prop = RNA_def_property(srna, "name", PROP_STRING, PROP_NONE);
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
@@ -1341,6 +1367,14 @@ static void rna_def_operator(BlenderRNA *brna)
 	/* RNA_def_property_clear_flag(prop, PROP_EDITABLE); */
 	RNA_def_property_flag(prop, PROP_REGISTER);
 
+	prop = RNA_def_property(srna, "bl_translation_context", PROP_STRING, PROP_NONE);
+	RNA_def_property_string_sdna(prop, NULL, "type->translation_context");
+	RNA_def_property_string_maxlength(prop, RNA_DYN_DESCR_MAX); /* else it uses the pointer size! */
+	RNA_def_property_string_funcs(prop, NULL, NULL, "rna_Operator_bl_translation_context_set");
+	RNA_def_property_string_default(prop, BLF_I18NCONTEXT_OPERATOR_DEFAULT);
+	RNA_def_property_flag(prop, PROP_REGISTER_OPTIONAL);
+	RNA_def_property_clear_flag(prop, PROP_NEVER_NULL); /* check for NULL */
+
 	prop = RNA_def_property(srna, "bl_description", PROP_STRING, PROP_NONE);
 	RNA_def_property_string_sdna(prop, NULL, "type->description");
 	RNA_def_property_string_maxlength(prop, RNA_DYN_DESCR_MAX); /* else it uses the pointer size! */
@@ -1377,6 +1411,7 @@ static void rna_def_macro_operator(BlenderRNA *brna)
 	RNA_def_struct_register_funcs(srna, "rna_MacroOperator_register", "rna_Operator_unregister",
 	                              "rna_Operator_instance");
 #endif
+	RNA_def_struct_translation_context(srna, BLF_I18NCONTEXT_OPERATOR_DEFAULT);
 
 	prop = RNA_def_property(srna, "name", PROP_STRING, PROP_NONE);
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
@@ -1405,6 +1440,14 @@ static void rna_def_macro_operator(BlenderRNA *brna)
 	/* RNA_def_property_clear_flag(prop, PROP_EDITABLE); */
 	RNA_def_property_flag(prop, PROP_REGISTER);
 
+	prop = RNA_def_property(srna, "bl_translation_context", PROP_STRING, PROP_NONE);
+	RNA_def_property_string_sdna(prop, NULL, "type->translation_context");
+	RNA_def_property_string_maxlength(prop, RNA_DYN_DESCR_MAX); /* else it uses the pointer size! */
+	RNA_def_property_string_funcs(prop, NULL, NULL, "rna_Operator_bl_translation_context_set");
+	RNA_def_property_string_default(prop, BLF_I18NCONTEXT_OPERATOR_DEFAULT);
+	RNA_def_property_flag(prop, PROP_REGISTER_OPTIONAL);
+	RNA_def_property_clear_flag(prop, PROP_NEVER_NULL); /* check for NULL */
+
 	prop = RNA_def_property(srna, "bl_description", PROP_STRING, PROP_NONE);
 	RNA_def_property_string_sdna(prop, NULL, "type->description");
 	RNA_def_property_string_maxlength(prop, RNA_DYN_DESCR_MAX); /* else it uses the pointer size! */
diff --git a/source/blender/python/intern/bpy_operator_wrap.c b/source/blender/python/intern/bpy_operator_wrap.c
index 9d92ff51213..1c722243424 100644
--- a/source/blender/python/intern/bpy_operator_wrap.c
+++ b/source/blender/python/intern/bpy_operator_wrap.c
@@ -127,6 +127,11 @@ void operator_wrapper(wmOperatorType *ot, void *userdata)
 	*ot = *((wmOperatorType *)userdata);
 	ot->srna = srna; /* restore */
 
+	/* Use i18n context from ext.srna if possible (py operators). */
+	if (ot->ext.srna) {
+		RNA_def_struct_translation_context(ot->srna, RNA_struct_translation_context(ot->ext.srna));
+	}
+
 	operator_properties_init(ot);
 }
 
@@ -143,6 +148,11 @@ void macro_wrapper(wmOperatorType *ot, void *userdata)
 	ot->ui = data->ui;
 	ot->ext = data->ext;
 
+	/* Use i18n context from ext.srna if possible (py operators). */
+	if (ot->ext.srna) {
+		RNA_def_struct_translation_context(ot->srna, RNA_struct_translation_context(ot->ext.srna));
+	}
+
 	operator_properties_init(ot);
 }
 
diff --git a/source/blender/python/intern/bpy_rna.c b/source/blender/python/intern/bpy_rna.c
index bdb2f8fcc12..0adb5e2e90e 100644
--- a/source/blender/python/intern/bpy_rna.c
+++ b/source/blender/python/intern/bpy_rna.c
@@ -6950,7 +6950,7 @@ static int bpy_class_validate_recursive(PointerRNA *dummyptr, StructRNA *srna, v
 			}                                                                 \
 		}                                                                     \
 		Py_XDECREF(item);                                                     \
-	}  /* intendionally allow else here */
+	}  /* intentionally allow else here */
 
 			if      BPY_REPLACEMENT_STRING("bl_idname",      bpy_intern_str___name__)
 			else if BPY_REPLACEMENT_STRING("bl_description", bpy_intern_str___doc__)
diff --git a/source/blender/windowmanager/WM_types.h b/source/blender/windowmanager/WM_types.h
index f2750aa6d99..5c2aae11a60 100644
--- a/source/blender/windowmanager/WM_types.h
+++ b/source/blender/windowmanager/WM_types.h
@@ -512,6 +512,7 @@ typedef struct wmTimer {
 typedef struct wmOperatorType {
 	const char *name;		/* text for ui, undo */
 	const char *idname;		/* unique identifier */
+	const char *translation_context;
 	const char *description;	/* tooltips and python docs */
 
 	/* this callback executes the operator without any interactive input,
diff --git a/source/blender/windowmanager/intern/wm_operators.c b/source/blender/windowmanager/intern/wm_operators.c
index cb2caa52d15..8ea507f97e8 100644
--- a/source/blender/windowmanager/intern/wm_operators.c
+++ b/source/blender/windowmanager/intern/wm_operators.c
@@ -381,7 +381,9 @@ wmOperatorType *WM_operatortype_append_macro(const char *idname, const char *nam
 	
 	RNA_def_struct_ui_text(ot->srna, ot->name, ot->description);
 	RNA_def_struct_identifier(ot->srna, ot->idname);
-	RNA_def_struct_translation_context(ot->srna, BLF_I18NCONTEXT_OPERATOR_DEFAULT);
+	/* Use i18n context from ext.srna if possible (py operators). */
+	RNA_def_struct_translation_context(ot->srna, ot->ext.srna ? RNA_struct_translation_context(ot->ext.srna) :
+	                                                            BLF_I18NCONTEXT_OPERATOR_DEFAULT);
 
 	BLI_ghash_insert(global_ops_hash, (void *)ot->idname, ot);
 
-- 
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