default to minimum adult age, not a static 20

docs/rejuvenate.rst

@@ -6,9 +6,9 @@ rejuvenate
     :tags: fort armok units
 
 If your most valuable citizens are getting old, this tool can save them. It
-decreases the age of the selected dwarf to 20 years, or to the age specified.
-Age can only be increased (e.g. when this tool is run on babies or children)
-if the ``--force`` option is specified.
+decreases the age of the selected dwarf to the minimum adult age, or to the age
+specified. Age can only be increased (e.g. when this tool is run on babies or
+children) if the ``--force`` option is specified.
 
 Usage
 -----
@@ -21,21 +21,25 @@ Examples
 --------
 
 ``rejuvenate``
-    Set the age of the selected dwarf to 20 (if they're older).
+    Set the age of the selected dwarf to 18 (if they're older than 18). The
+    target age may be different if you have modded dwarves to become an adult
+    at a different age, or if you have selected a unit that is not a dwarf.
 ``rejuvenate --all``
-    Set the age of all dwarves over 20 to 20.
+    Set the ages of all adult citizens and residents to their minimum adult
+    ages.
 ``rejuvenate --all --force``
-    Set the age of all dwarves (including children and babies) to 20.
+    Set the ages of all citizens and residents (including children and babies)
+    to their minimum adult ages.
 ``rejuvenate --age 149 --force``
     Set the age of the selected dwarf to 149, even if they are younger.
 
 Options
 -------
 
 ``--all``
-    Rejuvenate all citizens, not just the selected one.
+    Rejuvenate all citizens and residents instead of a selected unit.
 ``--age <num>``
-    Sets the target to the age specified. If this is not set, the target age defaults to ``20``.
+    Sets the target to the age specified. If this is not set, the target age defaults to the minimum adult age for the unit.
 ``--force``
     Set age for units under the specified age to the specified age. Useful if
     there are too many babies around...

rejuvenate.lua

@@ -2,15 +2,40 @@
 
 local utils = require('utils')
 
+local DEFAULT_CHILD_AGE = 18
+local DEFAULT_OLD_AGE = 160
 local ANY_BABY = df.global.world.units.other.ANY_BABY
 
+local function get_caste_misc(unit)
+    local cre = df.creature_raw.find(unit.race)
+    if not cre then return end
+    if unit.caste < 0 or unit.caste >= #cre.caste then
+        return
+    end
+    return cre.caste[unit.caste].misc
+end
+
+local function get_adult_age(misc)
+    return misc and misc.child_age or DEFAULT_CHILD_AGE
+end
+
+local function get_rand_old_age(misc)
+    return misc and math.random(misc.maxage_min, misc.maxage_max) or DEFAULT_OLD_AGE
+end
+
 -- called by armoks-blessing
 function rejuvenate(unit, quiet, force, dry_run, age)
-    age = age or 20
+    local name = dfhack.df2console(dfhack.units.getReadableName(unit))
+    local misc = get_caste_misc(unit)
+    local adult_age = get_adult_age(misc)
+    age = age or adult_age
+    if age < adult_age then
+        dfhack.printerr('cannot set age to child or baby range')
+        return
+    end
     local current_year = df.global.cur_year
     local new_birth_year = current_year - age
-    local new_old_year = unit.old_year < 0 and -1 or math.max(unit.old_year, new_birth_year + 160)
-    local name = dfhack.df2console(dfhack.units.getReadableName(unit))
+    local new_old_year = unit.old_year < 0 and -1 or math.max(unit.old_year, new_birth_year + get_rand_old_age(misc))
     if unit.birth_year > new_birth_year and not force then
         if not quiet then
             dfhack.printerr(name .. ' is under ' .. age .. ' years old. Use --force to force.')
@@ -50,7 +75,7 @@ function rejuvenate(unit, quiet, force, dry_run, age)
         if hf then hf.profession = df.profession.STANDARD end
     end
     if not quiet then
-        print(name .. ' is now ' .. age .. ' years old and will live to at least 160')
+        print(name .. ' is now ' .. age .. ' years old and will live a normal lifespan henceforth')
     end
 end