Allow auto-calculation of proficiency-bonus (rpgtex#319)

Specifying no `proficiency-bonus` with no value or the special value `*` will calculate the proficiency bonus from the challenge rating. Co-authored-by: I Reyes <4106546+Darkade@users.noreply.github.com>
kbriggs · Sep 2, 2021 · 6510377 · 6510377
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diff --git a/example.tex b/example.tex
@@ -179,7 +179,7 @@ \chapter{Monsters and NPCs}
         senses = {darkvision 60 ft., passive Perception 10},
         languages = {Common, Goblin, Undercommon},
         challenge = 1,
-        proficiency-bonus = +2,
+        proficiency-bonus, % = +2
       ]
     % Traits
     \DndMonsterAction{Innate Spellcasting}

diff --git a/lib/dndmonster.sty b/lib/dndmonster.sty
@@ -239,6 +239,53 @@
       { #1 }
 }
 
+%% Monster CR/PB helper
+% \l_tmpa_tl - CR
+% \l_tmpb_tl - PB
+\cs_new_protected_nopar:Npn \__dnd_cr_pb:N #1
+  {
+    \tl_set:Nn \l_tmpa_tl {#1}
+    \str_case_e:nnTF {#1}
+      {
+        {0}   { \tl_set:Nn \l_tmpb_tl {+2} }
+        {1/8} { \tl_set:Nn \l_tmpb_tl {+2} }
+        {1/4} { \tl_set:Nn \l_tmpb_tl {+2} }
+        {1/2} { \tl_set:Nn \l_tmpb_tl {+2} }
+        {1}   { \tl_set:Nn \l_tmpb_tl {+2} }
+        {2}   { \tl_set:Nn \l_tmpb_tl {+2} }
+        {3}   { \tl_set:Nn \l_tmpb_tl {+2} }
+        {4}   { \tl_set:Nn \l_tmpb_tl {+2} }
+        {5}   { \tl_set:Nn \l_tmpb_tl {+3} }
+        {6}   { \tl_set:Nn \l_tmpb_tl {+3} }
+        {7}   { \tl_set:Nn \l_tmpb_tl {+3} }
+        {8}   { \tl_set:Nn \l_tmpb_tl {+3} }
+        {9}   { \tl_set:Nn \l_tmpb_tl {+4} }
+        {10}  { \tl_set:Nn \l_tmpb_tl {+4} }
+        {11}  { \tl_set:Nn \l_tmpb_tl {+4} }
+        {12}  { \tl_set:Nn \l_tmpb_tl {+4} }
+        {13}  { \tl_set:Nn \l_tmpb_tl {+5} }
+        {14}  { \tl_set:Nn \l_tmpb_tl {+5} }
+        {15}  { \tl_set:Nn \l_tmpb_tl {+5} }
+        {16}  { \tl_set:Nn \l_tmpb_tl {+5} }
+        {17}  { \tl_set:Nn \l_tmpb_tl {+6} }
+        {18}  { \tl_set:Nn \l_tmpb_tl {+6} }
+        {19}  { \tl_set:Nn \l_tmpb_tl {+6} }
+        {20}  { \tl_set:Nn \l_tmpb_tl {+6} }
+        {21}  { \tl_set:Nn \l_tmpb_tl {+7} }
+        {22}  { \tl_set:Nn \l_tmpb_tl {+7} }
+        {23}  { \tl_set:Nn \l_tmpb_tl {+7} }
+        {24}  { \tl_set:Nn \l_tmpb_tl {+7} }
+        {25}  { \tl_set:Nn \l_tmpb_tl {+8} }
+        {26}  { \tl_set:Nn \l_tmpb_tl {+8} }
+        {27}  { \tl_set:Nn \l_tmpb_tl {+8} }
+        {28}  { \tl_set:Nn \l_tmpb_tl {+8} }
+        {29}  { \tl_set:Nn \l_tmpb_tl {+9} }
+        {30}  { \tl_set:Nn \l_tmpb_tl {+9} }
+      }
+      { \numprint {\l_tmpb_tl} }
+      { #1 }
+  }
+
 %% Monster details
 \keys_define:nn { dnd / monster / details }
 {
@@ -269,7 +316,8 @@
   challenge .initial:n        = 1,
   challenge .value_required:n = true,
   proficiency-bonus .tl_set:N = \l__proficiency_tl,
-  proficiency-bonus .value_required:n = true,
+  proficiency-bonus .value_required:n = false,
+  proficiency-bonus .default:n = *,
   proficiencybonus .meta:n    = { proficiency-bonus = {#1} },
 }
 
@@ -288,7 +336,10 @@
       \tl_if_empty:NF {\l__proficiency_tl}
         {
           {\enit@svlabel{\enit@format{\pbonname}}}
-          \hskip \labelsep \l__proficiency_tl
+          \hskip \labelsep
+          \str_if_eq:VnTF \l__proficiency_tl *
+            {\__dnd_cr_pb:N {\l__challenge_tl}}
+            {\l__proficiency_tl}
         }
     \end {__dnd_monster_attributes}
 }