study potion. To use this potion, you must have:

- a level < 2 in the skill
- a STUDY order for a no-fee skill
Each potion adds 1 study attempt, up to a maximum of 15 attempts

src/common/gamecode/study.c

@@ -24,6 +24,7 @@
 
 #include <config.h>
 #include "eressea.h"
+#include "study.h"
 
 #include "alchemy.h"
 #include "building.h"
@@ -97,8 +98,8 @@ magic_lowskill(unit *u)
 
 /* ------------------------------------------------------------- */
 
-static int
-study_cost(unit *u, int talent)
+int
+study_cost(unit *u, skill_t talent)
 {
 	int stufe, k = 50;
 
@@ -122,12 +123,6 @@ study_cost(unit *u, int talent)
 
 /* ------------------------------------------------------------- */
 
-#define MAXTEACHERS 4
-typedef struct teaching_info {
-  unit * teachers[MAXTEACHERS];
-  int value;
-} teaching_info;
-
 static void 
 init_learning(struct attrib * a)
 {
@@ -140,7 +135,7 @@ done_learning(struct attrib * a)
 	free(a->data.v);
 }
 
-static const attrib_type at_learning = {
+const attrib_type at_learning = {
 	"learning",
 	init_learning, done_learning, NULL, NULL, NULL,
 	ATF_UNIQUE

src/common/items/Jamfile

@@ -8,6 +8,7 @@ SubDirHdrs $(SUBDIR)/.. ;
 SubDirHdrs $(SUBDIR)/../.. ;
 
 SOURCES =
+ artrewards.c
  birthday_firework.c
  catapultammo.c
  demonseye.c
@@ -15,10 +16,10 @@ SOURCES =
  questkeys.c
  racespoils.c
  seed.c
+ speedsail.c
+ studypotion.c
  weapons.c
  xerewards.c
- artrewards.c
- speedsail.c
  ;
 
 Library items : $(SOURCES) ;

src/common/items/items.c

@@ -20,6 +20,7 @@
 #include "artrewards.h"
 #include "weapons.h"
 #include "speedsail.h"
+#include "studypotion.h"
 #include "racespoils.h"
 #if GROWING_TREES
 # include "seed.h"
@@ -44,6 +45,7 @@ register_items(void)
 	register_racespoils();
   register_artrewards();
   register_speedsail();
+  register_studypotion();
 }
 
 void

src/common/items/items.vcproj

@@ -181,6 +181,12 @@
 		<File
 			RelativePath=".\speedsail.h">
 		</File>
+		<File
+			RelativePath=".\studypotion.c">
+		</File>
+		<File
+			RelativePath=".\studypotion.h">
+		</File>
 		<File
 			RelativePath=".\weapons.c">
 		</File>

src/common/items/speedsail.c

@@ -17,17 +17,17 @@
 #include "speedsail.h"
 
 /* kernel includes */
-#include <faction.h>
-#include <item.h>
-#include <message.h>
-#include <movement.h>
-#include <plane.h>
-#include <region.h>
-#include <ship.h>
-#include <unit.h>
+#include <kernel/faction.h>
+#include <kernel/item.h>
+#include <kernel/message.h>
+#include <kernel/movement.h>
+#include <kernel/plane.h>
+#include <kernel/region.h>
+#include <kernel/ship.h>
+#include <kernel/unit.h>
 
 /* util includes */
-#include <functions.h>
+#include <util/functions.h>
 
 /* libc includes */
 #include <assert.h>
@@ -61,25 +61,8 @@ use_speedsail(struct unit * u, const struct item_type * itype, int amount, struc
   return EUNUSABLE;
 }
 
-static resource_type rt_speedsail = {
-	{ "speedsail", "speedsail_p" },
-	{ "speedsail", "speedsail_p" },
-	RTF_ITEM,
-	&res_changeitem
-};
-
-
-item_type it_speedsail = {
-	&rt_speedsail,           /* resourcetype */
-	0, 0, 0,       /* flags, weight, capacity */
-	NULL,                    /* construction */
-	&use_speedsail,
-	NULL,
-	NULL
-};
-
 void
 register_speedsail(void)
 {
-	it_register(&it_speedsail);
+	register_function((pf_generic)use_speedsail, "use_speedsail");
 }

src/common/items/studypotion.c

@@ -0,0 +1,58 @@
+#include <config.h>
+#include <kernel/eressea.h>
+#include "studypotion.h"
+
+#include <kernel/faction.h>
+#include <kernel/item.h>
+#include <kernel/order.h>
+#include <kernel/skill.h>
+#include <kernel/study.h>
+#include <kernel/unit.h>
+
+#include <util/attrib.h>
+#include <util/functions.h>
+
+/* BEGIN it_studypotion */
+#define MAXGAIN 15
+static int
+use_studypotion(struct unit * u, const struct item_type * itype, int amount, struct order * ord)
+{
+  if (get_keyword(u->thisorder) == K_STUDY) {
+    skill_t sk;
+    skill * sv;
+
+    init_tokens(u->thisorder);
+    skip_token();
+    sk = findskill(getstrtoken(), u->faction->locale);
+    sv = get_skill(u, sk);
+
+    if (sv && sv->level > 2) {
+      /* TODO: message */
+    } else if (study_cost(u, sk)>0) {
+      /* TODO: message */
+    } else {
+      attrib * a = a_find(u->attribs, &at_learning);
+      teaching_info * teach;
+      if (a==NULL) {
+        a = a_add(&u->attribs, a_new(&at_learning));
+      }
+      teach = (teaching_info*) a->data.v;
+      if (amount>MAXGAIN) amount = MAXGAIN;
+      teach->value += amount * 30;
+      if (teach->value > MAXGAIN * 30) {
+        teach->value = MAXGAIN * 30;
+      }
+      i_change(&u->items, itype, -amount);
+      return 0;
+    }
+  }
+  return EUNUSABLE;
+}
+
+void
+register_studypotion(void)
+{
+  register_function((pf_generic)use_studypotion, "use_studypotion");
+}
+
+/* END it_studypotion */

src/common/items/studypotion.h

@@ -0,0 +1,26 @@
+/* vi: set ts=2:
+*
+*
+* Eressea PB(E)M host Copyright (C) 1998-2003
+*      Christian Schlittchen (corwin@amber.kn-bremen.de)
+*      Katja Zedel (katze@felidae.kn-bremen.de)
+*      Henning Peters (faroul@beyond.kn-bremen.de)
+*      Enno Rehling (enno@eressea-pbem.de)
+*      Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
+*
+* This program may not be used, modified or distributed without
+* prior permission by the authors of Eressea.
+*/
+
+#ifndef H_ITM_STUDYPOTION
+#define H_ITM_STUDYPOTION
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+  extern void register_studypotion(void);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

src/common/kernel/study.h

@@ -12,8 +12,30 @@
  * prior permission by the authors of Eressea.
  */
 
-void teaching(void);
-void learn(void);
+#ifndef H_KRNL_STUDY
+#define H_KRNL_STUDY
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void teaching(void);
+extern void learn(void);
 
 extern magic_t getmagicskill(void);
 extern boolean is_migrant(struct unit *u);
+extern int study_cost(struct unit *u, skill_t talent);
+
+#define MAXTEACHERS 4
+typedef struct teaching_info {
+  struct unit * teachers[MAXTEACHERS];
+  int value;
+} teaching_info;
+
+extern const struct attrib_type at_learning;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/res/de/strings.xml

@@ -6034,4 +6034,14 @@
     <text locale="en">grails</text>
   </string>
 
+  <string name="studypotion">
+    <text locale="de">Lerntrank</text>
+    <text locale="en">brain boost</text>
+  </string>
+
+  <string name="studypotion_p">
+    <text locale="de">Lerntränke</text>
+    <text locale="en">brain boosts</text>
+  </string>
+
 </strings>

src/res/resources.xml

@@ -21,6 +21,18 @@
     </item>
   </resource>
 
+  <resource name="studypotion">
+    <item weight="0">
+      <function name="use" value="use_studypotion"/>
+    </item>
+  </resource>
+
+  <resource name="speedsail">
+    <item weight="0">
+      <function name="use" value="use_speedsail"/>
+    </item>
+  </resource>
+
   <resource name="snowman">
     <!-- xmas gimmik -->
     <item notlost="yes" weight="1"/>