10 files changed, 115 insertions, 31 deletions

diff --git a/res/about/version.gmi b/res/about/version.gmi
index dfdf2b97..ba94f7e2 100644
--- a/res/about/version.gmi
+++ b/res/about/version.gmi
@@ -8,11 +8,14 @@
 
 ## 1.2
 * Help is opened on first run instead of the "About Lagrange" page to make it easier to discover important Gemini links like the FAQ.
+* Added search engine support: non-URL text entered in the navbar is passed onto the configured search query URL (Preferences > Network).
 * Short pages are centered vertically on actual page content excluding the top banner.
+* Added user preference for aligning all pages to the top of the window.
 * Shift+Insert can be used for pasting clipboard contents into input fields.
 * Added keybinding (F11) for toggling fullscreen mode. On macOS, the shortcut is ⌃⌘F as before.
 * Added keybinding for finding text on page.
-* Windows: Added a custom window frame to replace the default Windows one. This looks nicer but does not behave exactly like a native window frame. Added a setting to Preferences > Window for switching back to the default frame.
+* Scroll position remains fixed while horizontally resizing the window or sidebars.
+* Windows: Added a custom window frame to replace the default Windows one. This looks nicer but does not behave exactly like a native window frame. Added a setting to Preferences for switching back to the default frame.
 * Windows: Fixed a flash of white when the window is first opened.
 
 ## 1.1.3
diff --git a/src/app.c b/src/app.c
index 3d3dc6f8..b5eb5688 100644
--- a/src/app.c
+++ b/src/app.c
@@ -227,6 +227,7 @@ static iString *serializePrefs_App_(const iApp *d) {
     appendFormat_String(str, "proxy.gopher address:%s\n", cstr_String(&d->prefs.gopherProxy));
     appendFormat_String(str, "proxy.http address:%s\n", cstr_String(&d->prefs.httpProxy));
     appendFormat_String(str, "downloads path:%s\n", cstr_String(&d->prefs.downloadDir));
+    appendFormat_String(str, "searchurl address:%s\n", cstr_String(&d->prefs.searchUrl));
     return str;
 }
 
@@ -937,6 +938,8 @@ static iBool handlePrefsCommands_(iWidget *d, const char *cmd) {
                          isSelected_Widget(findChild_Widget(d, "prefs.ostheme")));
         postCommandf_App("decodeurls arg:%d",
                          isSelected_Widget(findChild_Widget(d, "prefs.decodeurls")));
+        postCommandf_App("searchurl address:%s",
+                         cstr_String(text_InputWidget(findChild_Widget(d, "prefs.searchurl"))));
         postCommandf_App("cachesize.set arg:%d",
                          toInt_String(text_InputWidget(findChild_Widget(d, "prefs.cachesize"))));
         postCommandf_App("proxy.gemini address:%s",
@@ -1122,6 +1125,15 @@ iBool willUseProxy_App(const iRangecc scheme) {
     return schemeProxy_App(scheme) != NULL;
 }
 
+const iString *searchQueryUrl_App(const iString *queryStringUnescaped) {
+    iApp *d = &app_;
+    if (isEmpty_String(&d->prefs.searchUrl)) {
+        return collectNew_String();
+    }
+    const iString *escaped = urlEncode_String(queryStringUnescaped);
+    return collectNewFormat_String("%s?%s", cstr_String(&d->prefs.searchUrl), cstr_String(escaped));
+}
+
 iBool handleCommand_App(const char *cmd) {
     iApp *d = &app_;
     if (equal_Command(cmd, "config.error")) {
@@ -1292,6 +1304,10 @@ iBool handleCommand_App(const char *cmd) {
         }
         return iTrue;
     }
+    else if (equal_Command(cmd, "searchurl")) {
+        setCStr_String(&d->prefs.searchUrl, suffixPtr_Command(cmd, "address"));
+        return iTrue;
+    }
     else if (equal_Command(cmd, "proxy.gemini")) {
         setCStr_String(&d->prefs.geminiProxy, suffixPtr_Command(cmd, "address"));
         return iTrue;
@@ -1474,6 +1490,7 @@ iBool handleCommand_App(const char *cmd) {
         setText_InputWidget(findChild_Widget(dlg, "prefs.cachesize"),
                             collectNewFormat_String("%d", d->prefs.maxCacheSize));
         setToggle_Widget(findChild_Widget(dlg, "prefs.decodeurls"), d->prefs.decodeUserVisibleURLs);
+        setText_InputWidget(findChild_Widget(dlg, "prefs.searchurl"), &d->prefs.searchUrl);
         setText_InputWidget(findChild_Widget(dlg, "prefs.proxy.gemini"), &d->prefs.geminiProxy);
         setText_InputWidget(findChild_Widget(dlg, "prefs.proxy.gopher"), &d->prefs.gopherProxy);
         setText_InputWidget(findChild_Widget(dlg, "prefs.proxy.http"), &d->prefs.httpProxy);
diff --git a/src/app.h b/src/app.h
index efaf0a3e..54c60d10 100644
--- a/src/app.h
+++ b/src/app.h
@@ -75,6 +75,7 @@ iBool               forceSoftwareRender_App(void);
 enum iColorTheme    colorTheme_App      (void);
 const iString *     schemeProxy_App     (iRangecc scheme);
 iBool               willUseProxy_App    (const iRangecc scheme);
+const iString *     searchQueryUrl_App  (const iString *queryStringUnescaped);
 
 typedef void (*iTickerFunc)(iAny *);
 
diff --git a/src/gmutil.c b/src/gmutil.c
index 0e0cccc5..32bf356f 100644
--- a/src/gmutil.c
+++ b/src/gmutil.c
@@ -272,6 +272,21 @@ const iString *absoluteUrl_String(const iString *d, const iString *urlMaybeRelat
     return absolute;
 }
 
+iBool isLikelyUrl_String(const iString *d) {
+    /* Guess whether a human intends the string to be an URL. This is supposed to be fuzzy;
+       not completely per-spec: a) begins with a scheme; b) has something that looks like a
+       hostname */
+    iRegExp *pattern = new_RegExp("^([a-z]+:)?//.*|"
+                                  "^(//)?([^/?#: ]+)([/?#:].*)$|"
+                                  "^(\\w+(\\.\\w+)+|localhost)$",
+                                  caseInsensitive_RegExpOption);
+    iRegExpMatch m;
+    init_RegExpMatch(&m);
+    const iBool likelyUrl = matchString_RegExp(pattern, d, &m);
+    iRelease(pattern);
+    return likelyUrl;
+}
+
 static iBool equalPuny_(const iString *d, iRangecc orig) {
     if (!endsWith_String(d, "-")) {
         return iFalse; /* This is a sufficient condition? */
diff --git a/src/gmutil.h b/src/gmutil.h
index 1caf2445..26385c02 100644
--- a/src/gmutil.h
+++ b/src/gmutil.h
@@ -104,6 +104,7 @@ void            init_Url                (iUrl *, const iString *text);
 iRangecc        urlScheme_String        (const iString *);
 iRangecc        urlHost_String          (const iString *);
 const iString * absoluteUrl_String      (const iString *, const iString *urlMaybeRelative);
+iBool           isLikelyUrl_String      (const iString *);
 void            punyEncodeUrlHost_String(iString *);
 void            stripDefaultUrlPort_String(iString *);
 const iString * urlFragmentStripped_String(const iString *);
diff --git a/src/prefs.c b/src/prefs.c
index a8f34b02..f9186ab3 100644
--- a/src/prefs.c
+++ b/src/prefs.c
@@ -51,9 +51,11 @@ void init_Prefs(iPrefs *d) {
     init_String(&d->gopherProxy);
     init_String(&d->httpProxy);
     init_String(&d->downloadDir);
+    initCStr_String(&d->searchUrl, "gemini://gus.guru/search");
 }
 
 void deinit_Prefs(iPrefs *d) {
+    deinit_String(&d->searchUrl);
     deinit_String(&d->geminiProxy);
     deinit_String(&d->gopherProxy);
     deinit_String(&d->httpProxy);
diff --git a/src/prefs.h b/src/prefs.h
index dcda695f..1889c338 100644
--- a/src/prefs.h
+++ b/src/prefs.h
@@ -48,6 +48,7 @@ struct Impl_Prefs {
     iBool            hoverLink;
     iBool            smoothScrolling;
     iBool            loadImageInsteadOfScrolling;
+    iString          searchUrl;
     /* Network */
     iBool            decodeUserVisibleURLs;
     int              maxCacheSize; /* MB */
diff --git a/src/ui/documentwidget.c b/src/ui/documentwidget.c
index 603af076..232b4140 100644
--- a/src/ui/documentwidget.c
+++ b/src/ui/documentwidget.c
@@ -133,6 +133,7 @@ enum iDocumentWidgetFlag {
     showLinkNumbers_DocumentWidgetFlag       = iBit(3),
     setHoverViaKeys_DocumentWidgetFlag       = iBit(4),
     newTabViaHomeKeys_DocumentWidgetFlag     = iBit(5),
+    centerVertically_DocumentWidgetFlag      = iBit(6),
 };
 
 enum iDocumentLinkOrdinalMode {
@@ -151,6 +152,7 @@ struct Impl_DocumentWidget {
     iGmRequest *   request;
     iAtomicInt     isRequestUpdated; /* request has new content, need to parse it */
     iObjectList *  media;
+    enum iGmStatusCode sourceStatus;
     iString        sourceHeader;
     iString        sourceMime;
     iBlock         sourceContent; /* original content as received, for saving */
@@ -231,6 +233,7 @@ void init_DocumentWidget(iDocumentWidget *d) {
     init_Array(&d->outline, sizeof(iOutlineItem));
     init_Anim(&d->sideOpacity, 0);
     init_Anim(&d->outlineOpacity, 0);
+    d->sourceStatus = none_GmStatusCode;
     init_String(&d->sourceHeader);
     init_String(&d->sourceMime);
     init_Block(&d->sourceContent, 0);
@@ -332,7 +335,7 @@ static iRect documentBounds_DocumentWidget_(const iDocumentWidget *d) {
         rect.pos.y += margin;
         rect.size.y -= margin;
     }
-    if (prefs_App()->centerShortDocs) {
+    if (d->flags & centerVertically_DocumentWidgetFlag) {
         const iInt2 docSize = size_GmDocument(d->doc);
         if (docSize.y < rect.size.y) {
             /* Center vertically if short. There is one empty paragraph line's worth of margin
@@ -592,6 +595,10 @@ static iRangecc currentHeading_DocumentWidget_(const iDocumentWidget *d) {
 }
 
 static void updateVisible_DocumentWidget_(iDocumentWidget *d) {
+    iChangeFlags(d->flags,
+                 centerVertically_DocumentWidgetFlag,
+                 prefs_App()->centerShortDocs || startsWithCase_String(d->mod.url, "about:") ||
+                     !isSuccess_GmStatusCode(d->sourceStatus));
     const iRangei visRange = visibleRange_DocumentWidget_(d);
     const iRect   bounds   = bounds_Widget(as_Widget(d));
     setRange_ScrollWidget(d->scroll, (iRangei){ 0, scrollMax_DocumentWidget_(d) });
@@ -1038,6 +1045,7 @@ static iBool updateFromHistory_DocumentWidget_(iDocumentWidget *d) {
         /* Use the cached response data. */
         updateTrust_DocumentWidget_(d, resp);
         d->sourceTime = resp->when;
+        d->sourceStatus = success_GmStatusCode;
         format_String(&d->sourceHeader, "(cached content)");
         updateTimestampBuf_DocumentWidget_(d);
         set_Block(&d->sourceContent, &resp->body);
@@ -1113,6 +1121,9 @@ static void scroll_DocumentWidget_(iDocumentWidget *d, int offset) {
 }
 
 static void scrollTo_DocumentWidget_(iDocumentWidget *d, int documentY, iBool centered) {
+    if (!hasSiteBanner_GmDocument(d->doc)) {
+        documentY += d->pageMargin * gap_UI;
+    }
     init_Anim(&d->scrollY,
               documentY - (centered ? documentBounds_DocumentWidget_(d).size.y / 2
                                     : lineHeight_Text(paragraph_FontId)));
@@ -1192,6 +1203,7 @@ static void checkResponse_DocumentWidget_(iDocumentWidget *d) {
         updateTrust_DocumentWidget_(d, resp);
         init_Anim(&d->sideOpacity, 0);
         format_String(&d->sourceHeader, "%d %s", statusCode, get_GmError(statusCode)->title);
+        d->sourceStatus = statusCode;
         switch (category_GmStatusCode(statusCode)) {
             case categoryInput_GmStatusCode: {
                 iUrl parts;
@@ -1538,28 +1550,43 @@ static const int homeRowKeys_[] = {
     't', 'y',
 };
 
+static void updateDocumentWidthRetainingScrollPosition_DocumentWidget_(iDocumentWidget *d,
+                                                                       iBool keepCenter) {
+    /* Font changes (i.e., zooming) will keep the view centered, otherwise keep the top
+       of the visible area fixed. */
+    const iGmRun *run     = keepCenter ? middleRun_DocumentWidget_(d) : d->firstVisibleRun;
+    const char *  runLoc  = (run ? run->text.start : NULL);
+    int           voffset = 0;
+    if (!keepCenter && run) {
+        /* Keep the first visible run visible at the same position. */
+        /* TODO: First *fully* visible run? */
+        voffset = visibleRange_DocumentWidget_(d).start - top_Rect(run->visBounds);
+    }
+    setWidth_GmDocument(d->doc, documentWidth_DocumentWidget_(d));
+    if (runLoc && !keepCenter) {
+        run = findRunAtLoc_GmDocument(d->doc, runLoc);
+        if (run) {
+            scrollTo_DocumentWidget_(d,
+                                     top_Rect(run->visBounds) +
+                                         lineHeight_Text(paragraph_FontId) + voffset,
+                                     iFalse);
+        }
+    }
+    else if (runLoc && keepCenter) {
+        run = findRunAtLoc_GmDocument(d->doc, runLoc);
+        if (run) {
+            scrollTo_DocumentWidget_(d, mid_Rect(run->bounds).y, iTrue);
+        }
+    }
+}
+
 static iBool handleCommand_DocumentWidget_(iDocumentWidget *d, const char *cmd) {
     iWidget *w = as_Widget(d);
     if (equal_Command(cmd, "window.resized") || equal_Command(cmd, "font.changed")) {
-        const iBool isVerticalOnly =
-            !argLabel_Command(cmd, "horiz") && argLabel_Command(cmd, "vert");
         /* Alt/Option key may be involved in window size changes. */
         iChangeFlags(d->flags, showLinkNumbers_DocumentWidgetFlag, iFalse);
-        if (isVerticalOnly) {
-            scroll_DocumentWidget_(d, 0); /* prevent overscroll */
-        }
-        else {
-            const iGmRun *mid = middleRun_DocumentWidget_(d);
-            const char *midLoc = (mid ? mid->text.start : NULL);
-            setWidth_GmDocument(d->doc, documentWidth_DocumentWidget_(d));
-            scroll_DocumentWidget_(d, 0);
-            if (midLoc) {
-                mid = findRunAtLoc_GmDocument(d->doc, midLoc);
-                if (mid) {
-                    scrollTo_DocumentWidget_(d, mid_Rect(mid->bounds).y, iTrue);
-                }
-            }
-        }
+        const iBool keepCenter = equal_Command(cmd, "font.changed");
+        updateDocumentWidthRetainingScrollPosition_DocumentWidget_(d, keepCenter);
         updateSideIconBuf_DocumentWidget_(d);
         updateOutline_DocumentWidget_(d);
         invalidate_DocumentWidget_(d);
@@ -1581,6 +1608,7 @@ static iBool handleCommand_DocumentWidget_(iDocumentWidget *d, const char *cmd)
     }
     else if (equal_Command(cmd, "theme.changed") && document_App() == d) {
         updateTheme_DocumentWidget_(d);
+        updateVisible_DocumentWidget_(d);
         updateTrust_DocumentWidget_(d, NULL);
         updateSideIconBuf_DocumentWidget_(d);
         invalidate_DocumentWidget_(d);
@@ -3398,7 +3426,7 @@ iBool isRequestOngoing_DocumentWidget(const iDocumentWidget *d) {
 }
 
 void updateSize_DocumentWidget(iDocumentWidget *d) {
-    setWidth_GmDocument(d->doc, documentWidth_DocumentWidget_(d));
+    updateDocumentWidthRetainingScrollPosition_DocumentWidget_(d, iFalse);
     resetWideRuns_DocumentWidget_(d);
     updateSideIconBuf_DocumentWidget_(d);
     updateOutline_DocumentWidget_(d);
diff --git a/src/ui/util.c b/src/ui/util.c
index b52dea2d..553d9078 100644
--- a/src/ui/util.c
+++ b/src/ui/util.c
@@ -1123,10 +1123,10 @@ iWidget *makePreferences_Widget(void) {
         addChild_Widget(headings, iClob(makeHeading_Widget("Saturation:")));
         iWidget *sats = new_Widget();
         /* Saturation levels. */ {
-            addRadioButton_(sats, "prefs.saturation.3", "Full", "saturation.set arg:100");
-            addRadioButton_(sats, "prefs.saturation.2", "Reduced", "saturation.set arg:66");
-            addRadioButton_(sats, "prefs.saturation.1", "Minimal", "saturation.set arg:33");
-            addRadioButton_(sats, "prefs.saturation.0", "Monochrome", "saturation.set arg:0");
+            addRadioButton_(sats, "prefs.saturation.3", "100 %%", "saturation.set arg:100");
+            addRadioButton_(sats, "prefs.saturation.2", "66 %%", "saturation.set arg:66");
+            addRadioButton_(sats, "prefs.saturation.1", "33 %%", "saturation.set arg:33");
+            addRadioButton_(sats, "prefs.saturation.0", "0 %%", "saturation.set arg:0");
         }
         addChildFlags_Widget(values, iClob(sats), arrangeHorizontal_WidgetFlag | arrangeSize_WidgetFlag);
     }
@@ -1175,6 +1175,10 @@ iWidget *makePreferences_Widget(void) {
     }
     /* Network. */ {
         appendTwoColumnPage_(tabs, "Network", '5', &headings, &values);
+        addChild_Widget(headings, iClob(makeHeading_Widget("Search URL:")));
+        setId_Widget(addChild_Widget(values, iClob(new_InputWidget(0))), "prefs.searchurl");
+        addChild_Widget(headings, iClob(makeHeading_Widget("Decode URLs:")));
+        addChild_Widget(values, iClob(makeToggle_Widget("prefs.decodeurls")));
         addChild_Widget(headings, iClob(makeHeading_Widget("Cache size:")));
         iWidget *cacheGroup = new_Widget(); {
             iInputWidget *cache = new_InputWidget(4);
@@ -1183,8 +1187,6 @@ iWidget *makePreferences_Widget(void) {
             addChildFlags_Widget(cacheGroup, iClob(new_LabelWidget("MB", NULL)), frameless_WidgetFlag);
         }
         addChildFlags_Widget(values, iClob(cacheGroup), arrangeHorizontal_WidgetFlag | arrangeSize_WidgetFlag);
-        addChild_Widget(headings, iClob(makeHeading_Widget("Decode URLs:")));
-        addChild_Widget(values, iClob(makeToggle_Widget("prefs.decodeurls")));
         makeTwoColumnHeading_("PROXIES", headings, values);
         addChild_Widget(headings, iClob(makeHeading_Widget("Gemini proxy:")));
         setId_Widget(addChild_Widget(values, iClob(new_InputWidget(0))), "prefs.proxy.gemini");
@@ -1201,6 +1203,7 @@ iWidget *makePreferences_Widget(void) {
     resizeToLargestPage_Widget(tabs);
     arrange_Widget(dlg);
     /* Set input field sizes. */ {
+        expandInputFieldWidth_(findChild_Widget(tabs, "prefs.searchurl"));
         expandInputFieldWidth_(findChild_Widget(tabs, "prefs.downloads"));
         expandInputFieldWidth_(findChild_Widget(tabs, "prefs.proxy.gemini"));
         expandInputFieldWidth_(findChild_Widget(tabs, "prefs.proxy.gopher"));
diff --git a/src/ui/window.c b/src/ui/window.c
index d6a41d3b..563d57ae 100644
--- a/src/ui/window.c
+++ b/src/ui/window.c
@@ -47,6 +47,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
 #include <the_Foundation/file.h>
 #include <the_Foundation/path.h>
+#include <the_Foundation/regexp.h>
 #include <SDL_hints.h>
 #include <SDL_timer.h>
 #include <SDL_syswm.h>
@@ -419,9 +420,14 @@ static iBool handleNavBarCommands_(iWidget *navBar, const char *cmd) {
             !isFocused_Widget(findWidget_App("lookup"))) {
             iString *newUrl = copy_String(text_InputWidget(url));
             trim_String(newUrl);
-            postCommandf_App(
-                "open url:%s",
-                cstr_String(absoluteUrl_String(&iStringLiteral(""), collect_String(newUrl))));
+            if (!isEmpty_String(&prefs_App()->searchUrl) && !isLikelyUrl_String(newUrl)) {
+                postCommandf_App("open url:%s", cstr_String(searchQueryUrl_App(newUrl)));
+            }
+            else {
+                postCommandf_App(
+                    "open url:%s",
+                    cstr_String(absoluteUrl_String(&iStringLiteral(""), collect_String(newUrl))));
+            }
             return iTrue;
         }
     }
@@ -1028,7 +1034,14 @@ static void invalidate_Window_(iWindow *d) {
 }
 
 static iBool isNormalPlacement_Window_(const iWindow *d) {
-    if (snap_Window(d) || d->isDrawFrozen) return iFalse;
+    if (d->isDrawFrozen) return iFalse;
+#if defined (iPlatformApple)
+    /* Maximized mode is not special on macOS. */
+    if (snap_Window(d) == maximized_WindowSnap) {
+        return iTrue;
+    }
+#endif
+    if (snap_Window(d)) return iFalse;
     return !(SDL_GetWindowFlags(d->win) & SDL_WINDOW_MINIMIZED);
 }
 
@@ -1161,7 +1174,7 @@ static iBool handleWindowEvent_Window_(iWindow *d, const SDL_WindowEvent *ev) {
             //updateRootSize_Window_(d, iTrue);
             invalidate_Window_(d);
             d->isMinimized = iFalse;
-            //printf("restored %d\n", snap_Window(d)); fflush(stdout);
+            printf("restored %d\n", snap_Window(d)); fflush(stdout);
             return iTrue;
         case SDL_WINDOWEVENT_MINIMIZED:
             d->isMinimized = iTrue;