Allow pinning the cmdline to be aligned to the bottom of window

runtime/doc/gui_mac.txt

@@ -256,20 +256,21 @@ Here is a list of relevant dictionary entries:
 
 KEY				VALUE ~
 *MMCellWidthMultiplier*		width of a normal glyph in em units [float]
+*MMCmdLineAlignBottom*		Pin command-line to bottom of MacVim [bool]
 *MMDialogsTrackPwd*		open/save dialogs track the Vim pwd [bool]
 *MMDisableLaunchAnimation*	disable launch animation when opening a new
 				MacVim window [bool]
-*MMFullScreenFadeTime*		fade delay for non-native fullscreen [float]
+*MMFontPreserveLineSpacing*	use the line-spacing as specified by font [bool]
 *MMLoginShellArgument*		login shell parameter [string]
 *MMLoginShellCommand*		which shell to use to launch Vim [string]
+*MMFullScreenFadeTime*		fade delay for non-native fullscreen [float]
 *MMNativeFullScreen*		use native full screen mode [bool]
 *MMNonNativeFullScreenShowMenu*	show menus when in non-native full screen [bool]
 *MMNonNativeFullScreenSafeAreaBehavior*
 				behavior for non-native full sreen regarding
 				the safe area (aka the "notch") [int]
 *MMNoFontSubstitution*		disable automatic font substitution [bool]
 				(Deprecated: Non-CoreText renderer only)
-*MMFontPreserveLineSpacing*	use the line-spacing as specified by font [bool]
 *MMNoTitleBarWindow*		hide title bar [bool]
 *MMTitlebarAppearsTransparent*	enable a transparent titlebar [bool]
 *MMAppearanceModeSelection*	dark mode selection (|macvim-dark-mode|)[bool]

runtime/doc/tags

@@ -5405,6 +5405,7 @@ M	motion.txt	/*M*
 MDI	starting.txt	/*MDI*
 MMAppearanceModeSelection	gui_mac.txt	/*MMAppearanceModeSelection*
 MMCellWidthMultiplier	gui_mac.txt	/*MMCellWidthMultiplier*
+MMCmdLineAlignBottom	gui_mac.txt	/*MMCmdLineAlignBottom*
 MMDialogsTrackPwd	gui_mac.txt	/*MMDialogsTrackPwd*
 MMDisableLaunchAnimation	gui_mac.txt	/*MMDisableLaunchAnimation*
 MMFontPreserveLineSpacing	gui_mac.txt	/*MMFontPreserveLineSpacing*

src/MacVim/Base.lproj/Preferences.xib

@@ -257,11 +257,11 @@
             <point key="canvasLocation" x="137.5" y="21.5"/>
         </customView>
         <customView id="hr4-G4-3ZG" userLabel="Appearance">
-            <rect key="frame" x="0.0" y="0.0" width="483" height="315"/>
+            <rect key="frame" x="0.0" y="0.0" width="483" height="341"/>
             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
             <subviews>
                 <customView id="fw0-VK-Nbz" userLabel="Dark mode selection">
-                    <rect key="frame" x="19" y="137" width="433" height="156"/>
+                    <rect key="frame" x="19" y="163" width="433" height="156"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <subviews>
                         <textField verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" id="T40-Os-PUf" userLabel="Dark mode selection">
@@ -322,7 +322,7 @@
                     </subviews>
                 </customView>
                 <customView id="7af-iK-4r7" userLabel="Titlebar appearance">
-                    <rect key="frame" x="19" y="91" width="433" height="38"/>
+                    <rect key="frame" x="19" y="117" width="433" height="38"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <subviews>
                         <button id="7ie-0J-0Zr">
@@ -361,7 +361,7 @@
                     </subviews>
                 </customView>
                 <customView id="BpJ-rH-ona" userLabel="Full Screen">
-                    <rect key="frame" x="19" y="45" width="433" height="38"/>
+                    <rect key="frame" x="19" y="71" width="433" height="38"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <subviews>
                         <button toolTip="Use macOS's native full screen mode, which integrates with Mission Control and creates a new Space for the window." id="YKV-u2-Egc" userLabel="Use native full screen">
@@ -405,7 +405,7 @@
                     </subviews>
                 </customView>
                 <customView id="a3v-cB-TFa" userLabel="Font">
-                    <rect key="frame" x="19" y="20" width="433" height="18"/>
+                    <rect key="frame" x="19" y="46" width="433" height="18"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <subviews>
                         <button id="A48-s0-kdR" userLabel="Preserve Line Spacing">
@@ -432,8 +432,36 @@
                         </textField>
                     </subviews>
                 </customView>
+                <customView id="Dey-Wx-2gx" userLabel="Cmdline">
+                    <rect key="frame" x="20" y="20" width="433" height="18"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                    <subviews>
+                        <button id="qMh-iV-0iD">
+                            <rect key="frame" x="189" y="-1" width="244" height="18"/>
+                            <autoresizingMask key="autoresizingMask" flexibleMinY="YES"/>
+                            <string key="toolTip">When using smooth resizing, guioption+=k, or full screen; MacVim's window size can sometimes be slightly larger than Vim's content size, causing the command-line to not be aligned to the bottom. This option will make sure the command-line is always pinned to the bottom.</string>
+                            <buttonCell key="cell" type="check" title="Pin to the bottom of the window" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="uZL-IX-Dv8">
+                                <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
+                                <font key="font" metaFont="system"/>
+                            </buttonCell>
+                            <connections>
+                                <action selector="cmdlineAlignBottomChanged:" target="-2" id="LgN-MI-0Nt"/>
+                                <binding destination="58" name="value" keyPath="values.MMCmdLineAlignBottom" id="pIr-52-5vV"/>
+                            </connections>
+                        </button>
+                        <textField verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" id="Lzq-i0-zWi" userLabel="Cmdline">
+                            <rect key="frame" x="-2" y="0.0" width="187" height="17"/>
+                            <autoresizingMask key="autoresizingMask" flexibleMinY="YES"/>
+                            <textFieldCell key="cell" sendsActionOnEndEditing="YES" alignment="right" title="Command-line:" id="2Lp-vX-AcA">
+                                <font key="font" metaFont="system"/>
+                                <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
+                                <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
+                            </textFieldCell>
+                        </textField>
+                    </subviews>
+                </customView>
             </subviews>
-            <point key="canvasLocation" x="137.5" y="412.5"/>
+            <point key="canvasLocation" x="137.5" y="425.5"/>
         </customView>
         <customView id="620" userLabel="Advanced">
             <rect key="frame" x="0.0" y="0.0" width="483" height="264"/>
@@ -504,7 +532,7 @@
                     </connections>
                 </button>
             </subviews>
-            <point key="canvasLocation" x="137.5" y="743"/>
+            <point key="canvasLocation" x="144" y="911"/>
         </customView>
     </objects>
 </document>

src/MacVim/MMAppController.h

@@ -61,6 +61,7 @@
 - (void)refreshAllAppearances;
 - (void)refreshAllFonts;
 - (void)refreshAllResizeConstraints;
+- (void)refreshAllTextViews;
 
 - (IBAction)newWindow:(id)sender;
 - (IBAction)newWindowAndActivate:(id)sender;

src/MacVim/MMAppController.m

@@ -40,6 +40,7 @@
 #import "MMAppController.h"
 #import "MMPreferenceController.h"
 #import "MMVimController.h"
+#import "MMVimView.h"
 #import "MMWindowController.h"
 #import "MMTextView.h"
 #import "Miscellaneous.h"
@@ -253,6 +254,7 @@ + (void)initialize
         [NSNumber numberWithInt:0],       MMNonNativeFullScreenSafeAreaBehaviorKey,
         [NSNumber numberWithBool:YES],    MMShareFindPboardKey,
         [NSNumber numberWithBool:NO],     MMSmoothResizeKey,
+        [NSNumber numberWithBool:NO],     MMCmdLineAlignBottomKey,
         nil];
 
     [[NSUserDefaults standardUserDefaults] registerDefaults:dict];
@@ -1124,6 +1126,7 @@ - (void)refreshAllAppearances
     }
 }
 
+/// Refresh all Vim text views' fonts.
 - (void)refreshAllFonts
 {
     unsigned count = [vimControllers count];
@@ -1133,6 +1136,8 @@ - (void)refreshAllFonts
     }
 }
 
+/// Refresh all resize constraints based on smooth resize configurations
+/// and resize the windows to match the constraints.
 - (void)refreshAllResizeConstraints
 {
     const unsigned count = [vimControllers count];
@@ -1142,6 +1147,18 @@ - (void)refreshAllResizeConstraints
     }
 }
 
+/// Refresh all text views and re-render them, as well as updating their
+/// cmdline alignment properties to make sure they are pinned properly.
+- (void)refreshAllTextViews
+{
+    unsigned count = [vimControllers count];
+    for (unsigned i = 0; i < count; ++i) {
+        MMVimController *vc = [vimControllers objectAtIndex:i];
+        [vc.windowController.vimView.textView updateCmdlineRow];
+        vc.windowController.vimView.textView.needsDisplay = YES;
+    }
+}
+
 - (IBAction)newWindow:(id)sender
 {
     ASLogDebug(@"Open new window");

src/MacVim/MMBackend.m

@@ -1816,13 +1816,33 @@ - (void)insertVimStateMessage
     if (numTabs < 0)
         numTabs = 0;
 
+    // Custom hacks to deal with cmdline_row not being perfect for our use cases.
+    int cmdline_row_adjusted = cmdline_row;
+    if (State == MODE_HITRETURN) {
+        // When we are in hit-return mode, Vim does a weird thing and sets
+        // cmdline_row to be the 2nd-to-last row, which would make pinning
+        // cmdline to bottom look weird. This is done in msg_start() and
+        // wait_return().
+        // Instead of modifying Vim, we just hack around this by manually
+        // increasing the row by one. This would make the pin happen right at
+        // the "Hit Enter..." prompt.
+        cmdline_row_adjusted++;
+    } else if (State == MODE_ASKMORE) {
+        // In "more" mode, Vim sometimes set cmdline_row, sometimes it doesn't.
+        // Silver lining is that it always only takes one row and doesn't wrap
+        // like hit-enter, so we know we can always just pin it to the last row
+        // and be done with the hack.
+        cmdline_row_adjusted = Rows - 1;
+    }
+
     NSDictionary *vimState = [NSDictionary dictionaryWithObjectsAndKeys:
         [[NSFileManager defaultManager] currentDirectoryPath], @"pwd",
         [NSNumber numberWithInt:p_mh], @"p_mh",
         [NSNumber numberWithBool:mmta], @"p_mmta",
         [NSNumber numberWithInt:numTabs], @"numTabs",
         [NSNumber numberWithInt:fuoptions_flags], @"fullScreenOptions",
         [NSNumber numberWithLong:p_mouset], @"p_mouset",
+        [NSNumber numberWithInt:cmdline_row_adjusted], @"cmdline_row", // Used for pinning cmdline to bottom of window
         nil];
 
     // Put the state before all other messages.

src/MacVim/MMCoreTextView.h

@@ -86,6 +86,7 @@
 - (BOOL)convertPoint:(NSPoint)point toRow:(int *)row column:(int *)column;
 - (NSRect)rectForRow:(int)row column:(int)column numRows:(int)nr
           numColumns:(int)nc;
+- (void)updateCmdlineRow;
 
 //
 // NSTextView methods