[EOC] fix somethings and add somethings for #75675 string input

doc/EFFECT_ON_CONDITION.md

@@ -3050,8 +3050,9 @@ Store string from `set_string_var` in the variable object `target_var`
 
 | Property | Optionality | Type | Description |
 | --- | --- | --- | --- |
-| "title" | **mandatory** | string, [variable object](##variable-object) | The title of the input popup window, can be localized (e.g., `"title": { "i18n": true, "str": "Input a value:" }`). |
-| "description" | **mandatory** | string, [variable object](##variable-object) | The description of the input popup window, can be localized. |
+| "title" | optional | string, [variable object](##variable-object) | The title of the input popup window, can be localized (e.g., `"title": { "i18n": true, "str": "Input a value:" }`). |
+| "description" | optional | string, [variable object](##variable-object) | The description of the input popup window, can be localized. |
+| "default_text" | optional | string, [variable object](##variable-object) | The default text in the input popup window, can be localized. |
 | "width" | optional | integer | The character length of the input box. Default is 20. |
 | "identifier" | optional | string | Input boxes with the same identifier share input history. Default is `""`. |
 | "only_digits" | optional | boolean | Whether the input is purely numeric. Default is false. |
@@ -3060,7 +3061,7 @@ Store string from `set_string_var` in the variable object `target_var`
 
 | Avatar | Character | NPC | Monster |  Furniture | Item |
 | ------ | --------- | --------- | ---- | ------- | --- | 
-| ✔️ | ✔️ | ✔️ | ❌ | ❌ | ❌ |
+| ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ |
 
 ##### Examples
 Replace value of variable `foo` with value `bar`

lang/string_extractor/parsers/effect.py

@@ -87,6 +87,13 @@ def parse_effect(effects, origin, comment=""):
                         comment="String input window's description in {}"
                         .format(comment)
                     )
+                if "default_text" in string_input:
+                    write_translation_or_var(
+                        string_input["default_text"],
+                        origin,
+                        comment="String input window's default_text in {}"
+                        .format(comment)
+                    )
             if ("u_spawn_monster" in eff or "npc_spawn_monster" in eff or
                     "u_spawn_npc" in eff or "npc_spawn_npc" in eff):
                 if "u_spawn_monster" in eff or "npc_spawn_monster" in eff:

src/npctalk.cpp

@@ -4830,19 +4830,31 @@ talk_effect_fun_t::func f_set_string_var( const JsonObject &jo, std::string_view
         if( input_params.has_value() ) {
             string_input_popup popup;
             popup
-            .title( input_params.value().title.evaluate( d ) )
-            .description( input_params.value().description.evaluate( d ) )
+            .title( input_params.value().title ? input_params.value().title->evaluate( d ) : "" )
+            .description( input_params.value().description ? input_params.value().description->evaluate(
+                              d ) : "" )
             .width( input_params.value().width )
-            .identifier( input_params.value().identifier );
+            .identifier( input_params.value().identifier ? input_params.value().identifier->evaluate(
+                             d ) : "" );
 
             if( input_params.value().only_digits ) {
-                int num_temp;
+                int num_temp = 0;
+                try {
+                    num_temp = std::stoi( input_params.value().default_text.has_value() ?
+                                          input_params.value().default_text->evaluate(
+                                              d ) : "0" );
+                } catch( const std::out_of_range &e ) {
+                    debugmsg( "The number is too large to fit in an int." );
+                } catch( const std::invalid_argument &e ) {
+                };
                 popup.edit( num_temp );
                 if( !popup.canceled() ) {
                     str = std::to_string( num_temp );
                 }
             } else {
-                std::string str_temp;
+                std::string str_temp = input_params.value().default_text ?
+                                       input_params.value().default_text->evaluate(
+                                           d ) : "";
                 popup.edit( str_temp );
                 if( !popup.canceled() ) {
                     str = str_temp;

src/string_input_popup.cpp

@@ -680,11 +680,16 @@ string_input_params string_input_params::parse_string_input_params( const JsonOb
         const JsonValue &jv_description = jo.get_member( "description" );
         p.description = get_str_translation_or_var( jv_description, "" );
     }
+    if( jo.has_member( "default_text" ) ) {
+        const JsonValue &jv_default_text = jo.get_member( "default_text" );
+        p.default_text = get_str_translation_or_var( jv_default_text, "" );
+    }
     if( jo.has_int( "width" ) ) {
         p.width = jo.get_int( "width" );
     }
-    if( jo.has_string( "identifier" ) ) {
-        p.identifier = jo.get_string( "identifier" );
+    if( jo.has_member( "identifier" ) ) {
+        const JsonValue &jv_identifier = jo.get_member( "identifier" );
+        p.identifier = get_str_or_var( jv_identifier, "" );
     }
     if( jo.has_bool( "only_digits" ) ) {
         p.only_digits = jo.get_bool( "only_digits" );

src/string_input_popup.h

@@ -294,10 +294,11 @@ class string_input_popup // NOLINT(cata-xy)
 };
 
 struct string_input_params {
-    str_translation_or_var title;
-    str_translation_or_var description;
+    std::optional<str_translation_or_var> title;
+    std::optional<str_translation_or_var> description;
+    std::optional<str_translation_or_var> default_text;
     int width = 20;
-    std::string identifier;
+    std::optional<str_or_var> identifier;
     bool only_digits = false;
     static string_input_params parse_string_input_params( const JsonObject &jo );
 };