remove deprecated learn_skill function and configuration

conf/e4/config.json

@@ -49,7 +49,7 @@
         "recruit.allow_merge": true,
         "study.expensivemigrants": true,
         "study.speedup": 2,
-        "study.from_use": 0.4,
+        "study.produceexp": 12,
         "world.era": 3,
         "rules.reserve.twophase": true,
         "rules.owners.force_leave": false,

src/monsters.test.c

@@ -212,7 +212,7 @@ static void test_monsters_learn_exp(CuTest * tc)
     skill* sk;
 
     create_monsters(&f, &f2, &u, &m);
-    config_set("study.from_use", "1");
+    config_set("study.produceexp", "30");
 
     u_setrace(u, u_race(m));
     produceexp(u, SK_MELEE, u->number);

src/study.c

@@ -790,23 +790,22 @@ int study_cmd(unit * u, order * ord)
     return 0;
 }
 
-static double produceexp_chance(void) {
-    return config_get_flt("study.from_use", 1.0 / 3);
+static int produceexp_days(void) {
+    return config_get_int("study.produceexp", 10);
 }
 
-void produceexp_ex(struct unit *u, skill_t sk, int n, bool(*learn)(unit *, skill_t, double))
+void produceexp_ex(struct unit *u, skill_t sk, int n, learn_fun learn)
 {
-    if (n != 0 && (is_monsters(u->faction) || playerrace(u_race(u)))) {
-        double chance = produceexp_chance();
-        if (chance > 0.0F) {
-            learn(u, sk, (n * chance) / u->number);
-        }
+    assert(u && n <= u->number);
+    if (n > 0 && (is_monsters(u->faction) || playerrace(u_race(u)))) {
+        int days = produceexp_days();
+        learn(u, sk, days * n / u->number);
     }
 }
 
 void produceexp(struct unit *u, skill_t sk, int n)
 {
-    produceexp_ex(u, sk, n, learn_skill_depr);
+    produceexp_ex(u, sk, n, learn_skill);
 }
 
 #ifndef NO_TESTS
@@ -816,31 +815,6 @@ void inject_learn(learn_fun fun) {
     inject_learn_fun = fun;
 }
 #endif
-
-bool learn_skill_depr(unit * u, skill_t sk, double learn_chance)
-{
-    skill *sv = u->skills;
-    if (learn_chance < 1.0 && rng_int() % 10000 >= learn_chance * 10000)
-        if (!chance(learn_chance)) // FIXME: this nested if looks as if we are rolling twice!
-            return false;
-    while (sv != u->skills + u->skill_size) {
-        assert(sv->weeks > 0);
-        if (sv->id == sk) {
-            if (sv->weeks <= 1) {
-                sk_set(sv, sv->level + 1);
-            }
-            else {
-                sv->weeks--;
-            }
-            return true;
-        }
-        ++sv;
-    }
-    sv = add_skill(u, sk);
-    sk_set(sv, 1);
-    return true;
-}
-
 void learn_skill(unit *u, skill_t sk, int days) {
     int leveldays = STUDYDAYS * u->number;
     int weeks = 0;

src/study.h

@@ -41,11 +41,10 @@ extern "C" {
 #endif
 
 #define STUDYDAYS 30
-    bool learn_skill_depr(struct unit *u, skill_t sk, double chance);
     void learn_skill(struct unit *u, skill_t sk, int days);
 
     void produceexp(struct unit *u, skill_t sk, int n);
-    void produceexp_ex(struct unit *u, skill_t sk, int n, bool(*learn)(struct unit *, skill_t, double));
+    void produceexp_ex(struct unit *u, skill_t sk, int n, learn_fun learn);
 
     void demon_skillchange(struct unit *u);
 

src/study.test.c

@@ -141,16 +141,14 @@ static void test_study_bug_2194(CuTest *tc) {
 
 static CuTest *g_tc;
 
-static bool cb_learn_one(unit *u, skill_t sk, double chance) {
+static void cb_learn_one(unit *u, skill_t sk, int days) {
     CuAssertIntEquals(g_tc, SK_ALCHEMY, sk);
-    CuAssertDblEquals(g_tc, 0.5 / u->number, chance, 0.01);
-    return false;
+    CuAssertIntEquals(g_tc, 10, days);
 }
 
-static bool cb_learn_two(unit *u, skill_t sk, double chance) {
+static void cb_learn_two(unit *u, skill_t sk, int days) {
     CuAssertIntEquals(g_tc, SK_ALCHEMY, sk);
-    CuAssertDblEquals(g_tc, 2 * 0.5 / u->number, chance, 0.01);
-    return false;
+    CuAssertIntEquals(g_tc, 20, days);
 }
 
 static void test_produceexp(CuTest *tc) {
@@ -159,7 +157,8 @@ static void test_produceexp(CuTest *tc) {
     g_tc = tc;
     test_cleanup();
     u = test_create_unit(test_create_faction(0), test_create_region(0, 0, 0));
-    config_set("study.from_use", "0.5");
+    scale_number(u, 2);
+    config_set("study.produceexp", "20");
     produceexp_ex(u, SK_ALCHEMY, 1, cb_learn_one);
     produceexp_ex(u, SK_ALCHEMY, 2, cb_learn_two);
     test_cleanup();