# HG changeset patch
# Parent 0b2121431b0564b53bd70cefb03e70338be14095

diff --git a/src/ai/ai_gui.cpp b/src/ai/ai_gui.cpp
--- a/src/ai/ai_gui.cpp
+++ b/src/ai/ai_gui.cpp
@@ -23,6 +23,7 @@
 #include "../network/network.h"
 #include "../settings_func.h"
 #include "../network/network_content.h"
+#include "../textfile_gui.h"
 
 #include "ai.hpp"
 #include "../script/api/script_log.hpp"
@@ -563,6 +564,42 @@
 	new AISettingsWindow(&_ai_settings_desc, slot);
 }
 
+
+/** Window for displaying the textfile of a AI. */
+struct ScriptTextfileWindow : public TextfileWindow {
+	CompanyID slot; ///< View the textfile of this CompanyID slot.
+
+	ScriptTextfileWindow(const WindowDesc *desc, TextfileType file_type, CompanyID slot) : TextfileWindow(desc, file_type), slot(slot)
+	{
+		this->GetWidget<NWidgetCore>(WID_TF_CAPTION)->SetDataTip(STR_TEXTFILE_README_CAPTION + file_type, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS);
+
+		const char *textfile = GetConfig(slot)->GetScriptTextfile(file_type, slot);
+
+		this->LoadTextfile(textfile, (slot == OWNER_DEITY) ? GAME_DIR : AI_DIR);
+
+	}
+
+	/* virtual */ void SetStringParameters(int widget) const
+	{
+		if (widget == WID_TF_CAPTION) {
+			SetDParam(0, (slot == OWNER_DEITY) ? STR_CONTENT_TYPE_GAME_SCRIPT : STR_CONTENT_TYPE_AI);
+			SetDParamStr(1, GetConfig(slot)->GetName());
+		}
+	}
+};
+
+/**
+ * Open the AI version of the textfile window.
+ * @param file_type The type of textfile to display.
+ * @param slot The slot the Script is using.
+ */
+void ShowScriptTextfileWindow(TextfileType file_type, CompanyID slot)
+{
+	DeleteWindowByClass(WC_TEXTFILE);
+	new ScriptTextfileWindow(&_textfile_desc, file_type, slot);
+}
+
+
 /** Widgets for the configure AI window. */
 static const NWidgetPart _nested_ai_config_widgets[] = {
 	NWidget(NWID_HORIZONTAL),
@@ -596,6 +633,11 @@
 			NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_AIC_CHANGE), SetFill(1, 0), SetMinimalSize(93, 12), SetDataTip(STR_AI_CONFIG_CHANGE, STR_AI_CONFIG_CHANGE_TOOLTIP),
 			NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_AIC_CONFIGURE), SetFill(1, 0), SetMinimalSize(93, 12), SetDataTip(STR_AI_CONFIG_CONFIGURE, STR_AI_CONFIG_CONFIGURE_TOOLTIP),
 			NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_AIC_CLOSE), SetFill(1, 0), SetMinimalSize(93, 12), SetDataTip(STR_AI_SETTINGS_CLOSE, STR_NULL),
+			EndContainer(),
+		NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPIP(7, 0, 7),
+			NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_AIC_TEXTFILE + TFT_README), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_TEXTFILE_VIEW_README, STR_NULL),
+			NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_AIC_TEXTFILE + TFT_CHANGELOG), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_TEXTFILE_VIEW_CHANGELOG, STR_NULL),
+			NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_AIC_TEXTFILE + TFT_LICENSE), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_TEXTFILE_VIEW_LICENCE, STR_NULL),
 		EndContainer(),
 		NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_AIC_CONTENT_DOWNLOAD), SetFill(1, 0), SetMinimalSize(279, 12), SetPadding(0, 7, 9, 7), SetDataTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
 	EndContainer(),
@@ -732,6 +774,13 @@
 
 	virtual void OnClick(Point pt, int widget, int click_count)
 	{
+		if (widget >= WID_AIC_TEXTFILE && widget < WID_AIC_TEXTFILE + TFT_END) {
+			if (this->selected_slot == INVALID_COMPANY || GetConfig(this->selected_slot) == NULL) return;
+
+			ShowScriptTextfileWindow((TextfileType)(widget - WID_AIC_TEXTFILE), this->selected_slot);
+			return;
+		}
+
 		switch (widget) {
 			case WID_AIC_DECREASE:
 			case WID_AIC_INCREASE: {
@@ -822,6 +871,10 @@
 		this->SetWidgetDisabledState(WID_AIC_CONFIGURE, this->selected_slot == INVALID_COMPANY || GetConfig(this->selected_slot)->GetConfigList()->size() == 0);
 		this->SetWidgetDisabledState(WID_AIC_MOVE_UP, this->selected_slot == OWNER_DEITY || this->selected_slot == INVALID_COMPANY || !IsEditable((CompanyID)(this->selected_slot - 1)));
 		this->SetWidgetDisabledState(WID_AIC_MOVE_DOWN, this->selected_slot == OWNER_DEITY || this->selected_slot == INVALID_COMPANY || !IsEditable((CompanyID)(this->selected_slot + 1)));
+
+		for (TextfileType tft = TFT_BEGIN; tft < TFT_END; tft++) {
+			this->SetWidgetDisabledState(WID_AIC_TEXTFILE + tft, this->selected_slot == INVALID_COMPANY || (GetConfig(this->selected_slot)->GetScriptTextfile(tft, this->selected_slot) == NULL));
+		}
 	}
 };
 
diff --git a/src/script/api/game/game_window.hpp.sq b/src/script/api/game/game_window.hpp.sq
--- a/src/script/api/game/game_window.hpp.sq
+++ b/src/script/api/game/game_window.hpp.sq
@@ -180,6 +180,7 @@
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_AIC_CHANGE,                            "WID_AIC_CHANGE");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_AIC_CONFIGURE,                         "WID_AIC_CONFIGURE");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_AIC_CLOSE,                             "WID_AIC_CLOSE");
+	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_AIC_TEXTFILE,                          "WID_AIC_TEXTFILE");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_AIC_CONTENT_DOWNLOAD,                  "WID_AIC_CONTENT_DOWNLOAD");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_AID_VIEW,                              "WID_AID_VIEW");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_AID_NAME_TEXT,                         "WID_AID_NAME_TEXT");
diff --git a/src/script/api/script_window.hpp b/src/script/api/script_window.hpp
--- a/src/script/api/script_window.hpp
+++ b/src/script/api/script_window.hpp
@@ -843,6 +843,7 @@
 		WID_AIC_CHANGE                       = ::WID_AIC_CHANGE,                       ///< Select another AI button.
 		WID_AIC_CONFIGURE                    = ::WID_AIC_CONFIGURE,                    ///< Change AI settings button.
 		WID_AIC_CLOSE                        = ::WID_AIC_CLOSE,                        ///< Close window button.
+		WID_AIC_TEXTFILE                     = ::WID_AIC_TEXTFILE,                     ///< Open Script readme, changelog (+1) or license (+2).
 		WID_AIC_CONTENT_DOWNLOAD             = ::WID_AIC_CONTENT_DOWNLOAD,             ///< Download content button.
 	};
 
diff --git a/src/script/script_config.cpp b/src/script/script_config.cpp
--- a/src/script/script_config.cpp
+++ b/src/script/script_config.cpp
@@ -13,6 +13,7 @@
 #include "../settings_type.h"
 #include "../core/random_func.hpp"
 #include "script_info.hpp"
+#include "../textfile_gui.h"
 
 void ScriptConfig::Change(const char *name, int version, bool force_exact_match, bool is_random)
 {
@@ -198,3 +199,10 @@
 	size_t len = strlen(string);
 	if (len > 0) string[len - 1] = '\0';
 }
+
+const char *ScriptConfig::GetScriptTextfile(TextfileType type, CompanyID slot) const
+{
+	if (slot == INVALID_COMPANY || this->GetInfo() == NULL) return NULL;
+
+	return GetTextfile(type, (slot == OWNER_DEITY) ? GAME_DIR : AI_DIR, this->GetInfo()->GetMainScript());
+}
diff --git a/src/script/script_config.hpp b/src/script/script_config.hpp
--- a/src/script/script_config.hpp
+++ b/src/script/script_config.hpp
@@ -16,6 +16,8 @@
 #include <list>
 #include "../core/smallmap_type.hpp"
 #include "../core/string_compare_type.hpp"
+#include "../company_type.h"
+#include "../textfile_gui.h"
 
 /** Bitmask of flags for Script settings. */
 enum ScriptConfigFlags {
@@ -161,6 +163,14 @@
 	 */
 	void SettingsToString(char *string, size_t size) const;
 
+	/**
+	 * Search a textfile file next to this script.
+	 * @param type The type of the textfile to search for.
+	 * @param slot #CompanyID to check status of.
+	 * @return The filename for the textfile, \c NULL otherwise.
+	 */
+	const char *GetScriptTextfile(TextfileType type, CompanyID slot) const;
+
 protected:
 	const char *name;                  ///< Name of the Script
 	int version;                       ///< Version of the Script
diff --git a/src/widgets/ai_widget.h b/src/widgets/ai_widget.h
--- a/src/widgets/ai_widget.h
+++ b/src/widgets/ai_widget.h
@@ -13,6 +13,7 @@
 #define WIDGETS_AI_WIDGET_H
 
 #include "../company_type.h"
+#include "../textfile_type.h"
 
 /** Widgets of the #AIListWindow class. */
 enum AIListWidgets {
@@ -47,7 +48,8 @@
 	WID_AIC_CHANGE,           ///< Select another AI button.
 	WID_AIC_CONFIGURE,        ///< Change AI settings button.
 	WID_AIC_CLOSE,            ///< Close window button.
-	WID_AIC_CONTENT_DOWNLOAD, ///< Download content button.
+	WID_AIC_TEXTFILE,         ///< Open AI readme, changelog (+1) or license (+2).
+	WID_AIC_CONTENT_DOWNLOAD = WID_AIC_TEXTFILE + TFT_END, ///< Download content button.
 };
 
 /** Widgets of the #AIDebugWindow class. */