Index: CHANGES.txt
==================================================================
--- CHANGES.txt
+++ CHANGES.txt
@@ -1,5 +1,12 @@
+Version [next]
+
+[Feature] Support for hdtbl.
+[Changed] Build extras and build preprocessors are now listed in a multi-select box.
+
+-------------------------------
+
 Version 0.12.0
 2022-03-14
 
 [Feature] If the installed version of troff is not detected as groff, a warning is displayed.
 [Changed] On platforms which probably use a package manager (currently, Linux and BSDs), the "update check" checkbox is disabled and the related libraries are not referenced.

Index: src/groffstudio.lpi
==================================================================
--- src/groffstudio.lpi
+++ src/groffstudio.lpi
@@ -20,11 +20,11 @@
       </Resources>
     </General>
     <VersionInfo>
       <UseVersionInfo Value="True"/>
       <AutoIncrementBuild Value="True"/>
-      <MinorVersionNr Value="12"/>
+      <MinorVersionNr Value="13"/>
       <Attributes pvaPreRelease="True"/>
       <StringTable ProductName="groffstudio"/>
     </VersionInfo>
     <BuildModes>
       <Item Name="Default" Default="True"/>

Index: src/unit1.lfm
==================================================================
--- src/unit1.lfm
+++ src/unit1.lfm
@@ -1,22 +1,22 @@
 object MainForm: TMainForm
-  Left = 2381
+  Left = 2515
   Height = 692
   Top = 99
-  Width = 981
+  Width = 847
   Caption = 'groffstudio'
   ClientHeight = 692
-  ClientWidth = 981
+  ClientWidth = 847
   DefaultMonitor = dmPrimary
   OnClose = FormClose
   OnCreate = FormCreate
   LCLVersion = '2.3.0.0'
   object MainStatusBar: TStatusBar
     Left = 0
     Height = 23
     Top = 669
-    Width = 981
+    Width = 847
     Panels = <    
       item
         Text = 'file name with save status'
         Width = 200
       end    
@@ -32,33 +32,33 @@
   end
   object ExtendedNotebook1: TExtendedNotebook
     Left = 8
     Height = 662
     Top = 8
-    Width = 961
+    Width = 827
     ActivePage = tsEdit
     Anchors = [akTop, akLeft, akRight, akBottom]
     Style = tsFlatButtons
     TabIndex = 0
     TabOrder = 1
     object tsEdit: TTabSheet
       Caption = 'edit a groff document'
       ClientHeight = 631
-      ClientWidth = 953
+      ClientWidth = 819
       ParentFont = False
       object GroupBox1: TGroupBox
         Left = 10
         Height = 66
         Top = 560
-        Width = 933
+        Width = 799
         Align = alBottom
         BorderSpacing.Left = 10
         BorderSpacing.Right = 10
         BorderSpacing.Bottom = 5
         Caption = 'build'
         ClientHeight = 46
-        ClientWidth = 929
+        ClientWidth = 795
         TabOrder = 0
         object Label1: TLabel
           Left = 184
           Height = 15
           Top = -4
@@ -81,120 +81,54 @@
           )
           TabOrder = 0
           Text = '[ select ]'
         end
         object Label2: TLabel
-          Left = 806
+          Left = 672
           Height = 15
           Top = -4
           Width = 78
           Anchors = [akTop, akRight]
           Caption = 'output format:'
           ParentColor = False
         end
         object rdPs: TRadioButton
-          Left = 807
+          Left = 673
           Height = 19
           Top = 16
           Width = 71
           Anchors = [akTop, akRight]
           Caption = 'PostScript'
-          OnChange = rdPsChange
           TabOrder = 1
         end
         object rdPdf: TRadioButton
-          Left = 887
+          Left = 753
           Height = 19
           Top = 16
           Width = 39
           Anchors = [akTop, akRight]
           Caption = 'PDF'
-          OnChange = rdPdfChange
           TabOrder = 2
         end
         object Label3: TLabel
-          Left = 424
+          Left = 419
           Height = 15
           Top = -4
           Width = 76
           Anchors = [akTop, akRight]
           Caption = 'preprocessors:'
           ParentColor = False
         end
-        object chkEqn: TCheckBox
-          Left = 480
-          Height = 19
-          Top = 16
-          Width = 38
-          Anchors = [akTop, akRight]
-          Caption = 'eqn'
-          TabOrder = 3
-        end
-        object chkPic: TCheckBox
-          Left = 566
-          Height = 19
-          Top = 16
-          Width = 34
-          Anchors = [akTop, akRight]
-          Caption = 'pic'
-          TabOrder = 4
-        end
-        object chkTbl: TCheckBox
-          Left = 654
-          Height = 19
-          Top = 16
-          Width = 32
-          Anchors = [akTop, akRight]
-          Caption = 'tbl'
-          TabOrder = 5
-        end
-        object chkGrn: TCheckBox
-          Left = 524
-          Height = 19
-          Top = 16
-          Width = 36
-          Anchors = [akTop, akRight]
-          Caption = 'grn'
-          TabOrder = 6
-        end
-        object chkChem: TCheckBox
-          Left = 424
-          Height = 19
-          Top = 16
-          Width = 48
-          Anchors = [akTop, akRight]
-          Caption = 'chem'
-          TabOrder = 7
-        end
-        object chkRefer: TCheckBox
-          Left = 606
-          Height = 19
-          Top = 16
-          Width = 42
-          Anchors = [akTop, akRight]
-          Caption = 'refer'
-          TabOrder = 8
-        end
         object Label4: TLabel
-          Left = 707
+          Left = 544
           Height = 15
           Top = -4
           Width = 34
           Anchors = [akTop, akRight]
           Caption = 'extras:'
           ParentColor = False
         end
-        object chkPdfMark: TCheckBox
-          Left = 708
-          Height = 19
-          Top = 16
-          Width = 63
-          Anchors = [akTop, akRight]
-          Caption = 'Pdfmark'
-          Enabled = False
-          TabOrder = 9
-        end
         object btnBuild: TButton
           Left = 0
           Height = 29
           Top = 10
           Width = 75
@@ -202,25 +136,55 @@
           Color = clLime
           Enabled = False
           Font.Style = [fsBold, fsItalic]
           OnClick = btnBuildClick
           ParentFont = False
-          TabOrder = 10
+          TabOrder = 3
         end
         object chkLogFile: TCheckBox
           Left = 80
           Height = 19
           Hint = 'If enabled, a log file containing the groff output will be placed alongside the source document.'
           Top = 16
           Width = 68
           Caption = 'log to file'
           Enabled = False
-          TabOrder = 11
+          TabOrder = 4
+        end
+        object chkBoxPreprocessors: TCheckComboBox
+          Left = 419
+          Height = 24
+          Top = 15
+          Width = 100
+          Anchors = [akTop, akRight]
+          ItemHeight = 16
+          Items.Strings = (
+            'chem'
+            'eqn'
+            'grn'
+            'pic'
+            'refer'
+            'tbl'
+          )
+          TabOrder = 5
+        end
+        object chkBoxExtras: TCheckComboBox
+          Left = 544
+          Height = 24
+          Top = 15
+          Width = 100
+          Anchors = [akTop, akRight]
+          ItemHeight = 16
+          Items.Strings = (
+            'hdtbl'
+            'Pdfmark'
+          )
+          TabOrder = 6
         end
       end
       object btnSaveGroff: TButton
-        Left = 868
+        Left = 734
         Height = 28
         Top = 528
         Width = 75
         Anchors = [akRight, akBottom]
         Caption = 'save'
@@ -228,11 +192,11 @@
         OnClick = btnSaveGroffClick
         ParentFont = False
         TabOrder = 1
       end
       object btnLoadGroff: TButton
-        Left = 787
+        Left = 653
         Height = 28
         Top = 528
         Width = 75
         Anchors = [akRight, akBottom]
         Caption = 'load'
@@ -240,11 +204,11 @@
         OnClick = btnLoadGroffClick
         ParentFont = False
         TabOrder = 2
       end
       object Label5: TLabel
-        Left = 331
+        Left = 197
         Height = 15
         Top = 541
         Width = 438
         Anchors = [akRight, akBottom]
         Caption = 'note that everything build-related will be stored in the document''s storage directory'
@@ -255,11 +219,11 @@
       end
       inline SynEdit1: TSynEdit
         Left = 10
         Height = 523
         Top = 0
-        Width = 933
+        Width = 799
         Anchors = [akTop, akLeft, akRight, akBottom]
         Font.CharSet = 4
         Font.Height = -13
         Font.Name = 'Consolas'
         Font.Pitch = fpFixed
@@ -757,21 +721,21 @@
       end
     end
     object tsSettings: TTabSheet
       Caption = 'groffstudio settings'
       ClientHeight = 631
-      ClientWidth = 953
+      ClientWidth = 819
       object chkAutoSaveBuildSettings: TCheckBox
         Left = 0
         Height = 19
         Top = 16
         Width = 309
         Caption = 'save and restore the chosen build settings for next time'
         TabOrder = 0
       end
       object btnSaveSettings: TButton
-        Left = 864
+        Left = 730
         Height = 25
         Top = 600
         Width = 91
         Anchors = [akRight, akBottom]
         Caption = 'save settings'
@@ -796,23 +760,23 @@
       end
     end
     object tsGroff: TTabSheet
       Caption = 'groff version'
       ClientHeight = 631
-      ClientWidth = 953
+      ClientWidth = 819
       object GroupBox2: TGroupBox
         Left = 20
         Height = 57
         Top = 566
-        Width = 913
+        Width = 779
         Align = alBottom
         BorderSpacing.Left = 20
         BorderSpacing.Right = 20
         BorderSpacing.Bottom = 8
         Caption = 'groff for Windows'
         ClientHeight = 37
-        ClientWidth = 909
+        ClientWidth = 775
         TabOrder = 0
         object Label6: TLabel
           Left = 8
           Height = 15
           Top = 8
@@ -822,19 +786,19 @@
         end
         object edtOnlineGroffVersionWindows: TEdit
           Left = 136
           Height = 15
           Top = 8
-          Width = 676
+          Width = 542
           Anchors = [akTop, akLeft, akRight]
           BorderStyle = bsNone
           Enabled = False
           TabOrder = 0
           Text = 'fetching ...'
         end
         object btnDownloadGroffWindows: TButton
-          Left = 820
+          Left = 686
           Height = 25
           Top = 5
           Width = 80
           Anchors = [akTop, akRight]
           Caption = 'download it'
@@ -842,13 +806,13 @@
           TabOrder = 1
         end
       end
       object Label7: TLabel
         Left = 8
-        Height = 15
+        Height = 30
         Top = 8
-        Width = 941
+        Width = 807
         Anchors = [akTop, akLeft, akRight]
         Caption = 'as you might guess, groffstudio requires a working installation of groff. this page performs the basic checks for you. note that on windows, everything is harder than it should. :-)'
         Constraints.MaxHeight = 582
         ParentColor = False
         WordWrap = True
@@ -863,21 +827,21 @@
       end
       object edtGroffInstalledVersion: TEdit
         Left = 144
         Height = 15
         Top = 56
-        Width = 805
+        Width = 671
         Anchors = [akTop, akLeft, akRight]
         BorderStyle = bsNone
         Enabled = False
         TabOrder = 1
       end
       object lblTroffCommandNotFound: TLabel
         Left = 8
         Height = 45
         Top = 112
-        Width = 940
+        Width = 806
         Anchors = [akTop, akLeft, akRight]
         Caption = 'groff was not found. in order to use groffstudio, you absolutely need groff in your PATH variable. on unix and unix-like systems, you''ll need to edit the $PATH variable. on windows, i warmly recommend the Rapid Environment Editor for that.'#13#10'please exit groffstudio at your nearest convenience and adjust your PATH variables. then try again.'
         Font.Color = clRed
         ParentColor = False
         ParentFont = False
@@ -886,11 +850,11 @@
       end
       object edtGroffstudioInstalledVersion: TEdit
         Left = 144
         Height = 15
         Top = 77
-        Width = 805
+        Width = 671
         Anchors = [akTop, akLeft, akRight]
         BorderStyle = bsNone
         Enabled = False
         TabOrder = 2
       end
@@ -904,11 +868,11 @@
       end
     end
     object tsAbout: TTabSheet
       Caption = 'about groffstudio'
       ClientHeight = 631
-      ClientWidth = 953
+      ClientWidth = 819
       object lblAboutProductName: TLabel
         Left = 0
         Height = 61
         Top = 16
         Width = 315
@@ -958,11 +922,11 @@
       end
       object mLicense: TMemo
         Left = 0
         Height = 418
         Top = 216
-        Width = 960
+        Width = 826
         Anchors = [akTop, akLeft, akRight]
         ScrollBars = ssAutoBoth
         TabOrder = 0
       end
       object lblWebsite: TLabel

Index: src/unit1.pas
==================================================================
--- src/unit1.pas
+++ src/unit1.pas
@@ -19,12 +19,12 @@
 
 interface
 
 uses
   Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ComCtrls, StdCtrls,
-  ExtCtrls, Buttons, ExtendedNotebook, SynEdit, fphttpclient,
-  RegExpr, LCLIntf, LCLType, IniPropStorage, Process, Helpers, fileinfo,
+  ExtCtrls, Buttons, ExtendedNotebook, SynEdit, fphttpclient, RegExpr, LCLIntf,
+  LCLType, IniPropStorage, ComboEx, Process, Helpers, fileinfo,
   {$IF DEFINED(WINDOWS)}
   winpeimagereader, opensslsockets,
   {$ELSEIF DEFINED(DARWIN)}
   machoreader, ssockets, sslsockets, sslbase, opensslsockets,
   {$ELSEIF DEFINED(LINUX)}
@@ -40,20 +40,15 @@
     btnSaveGroff: TButton;
     btnLoadGroff: TButton;
     btnBuild: TButton;
     btnDownloadGroffWindows: TButton;
     btnSaveSettings: TButton;
+    chkBoxExtras: TCheckComboBox;
+    chkBoxPreprocessors: TCheckComboBox;
     chkUpdateCheckOnStart: TCheckBox;
     chkLogFile: TCheckBox;
     chkAutoSaveBuildSettings: TCheckBox;
-    chkPdfMark: TCheckBox;
-    chkRefer: TCheckBox;
-    chkChem: TCheckBox;
-    chkGrn: TCheckBox;
-    chkTbl: TCheckBox;
-    chkPic: TCheckBox;
-    chkEqn: TCheckBox;
     cmbMacro: TComboBox;
     edtGroffInstalledVersion: TEdit;
     edtGroffstudioInstalledVersion: TEdit;
     edtOnlineGroffVersionWindows: TEdit;
     ExtendedNotebook1: TExtendedNotebook;
@@ -98,12 +93,10 @@
     procedure FormClose(Sender: TObject; var CloseAction: TCloseAction);
     procedure FormCreate(Sender: TObject);
     procedure lblFossilRepoClick(Sender: TObject);
     procedure lblGithubRepoClick(Sender: TObject);
     procedure lblWebsiteClick(Sender: TObject);
-    procedure rdPdfChange(Sender: TObject);
-    procedure rdPsChange(Sender: TObject);
     procedure SynEdit1Change(Sender: TObject);
 {$IFDEF DARWIN}
     procedure GetSocketHandler(Sender: TObject; const UseSSL: Boolean; out AHandler: TSocketHandler);
 {$ENDIF}
   private
@@ -188,17 +181,18 @@
 
   if storeBuildSettings then
   begin
        chkLogFile.Checked := iniStorage.ReadBoolean('BuildLogFile', False);
        cmbMacro.Text := iniStorage.ReadString('BuildChosenMacro', '[ select ]');
-       chkChem.Checked := iniStorage.ReadBoolean('BuildUseChem', False);
-       chkEqn.Checked := iniStorage.ReadBoolean('BuildUseEqn', False);
-       chkGrn.Checked := iniStorage.ReadBoolean('BuildUseGrn', False);
-       chkPic.Checked := iniStorage.ReadBoolean('BuildUsePic', False);
-       chkRefer.Checked := iniStorage.ReadBoolean('BuildUseRefer', False);
-       chkTbl.Checked := iniStorage.ReadBoolean('BuildUseTbl', False);
-       chkPdfMark.Checked := iniStorage.ReadBoolean('BuildUsePdfMark', False);
+       chkBoxPreprocessors.Checked[0] := iniStorage.ReadBoolean('BuildUseChem', False);
+       chkBoxPreprocessors.Checked[1] := iniStorage.ReadBoolean('BuildUseEqn', False);
+       chkBoxPreprocessors.Checked[2] := iniStorage.ReadBoolean('BuildUseGrn', False);
+       chkBoxPreprocessors.Checked[3] := iniStorage.ReadBoolean('BuildUsePic', False);
+       chkBoxPreprocessors.Checked[4] := iniStorage.ReadBoolean('BuildUseRefer', False);
+       chkBoxPreprocessors.Checked[5] := iniStorage.ReadBoolean('BuildUseTbl', False);
+       chkBoxExtras.Checked[0] := iniStorage.ReadBoolean('BuildUseHdtbl', False);
+       chkBoxExtras.Checked[1] := iniStorage.ReadBoolean('BuildUsePdfMark', False);
        rdPs.Checked := iniStorage.ReadBoolean('BuildToPostscript', False);
        rdPdf.Checked := iniStorage.ReadBoolean('BuildToPDF', False);
   end;
 
   // What's the latest available version?
@@ -298,20 +292,10 @@
 procedure TMainForm.lblWebsiteClick(Sender: TObject);
 begin
   OpenURL('https://groff.tuxproject.de');
 end;
 
-procedure TMainForm.rdPdfChange(Sender: TObject);
-begin
-  chkPdfMark.Enabled := True;
-end;
-
-procedure TMainForm.rdPsChange(Sender: TObject);
-begin
-  chkPdfMark.Enabled := False;
-end;
-
 procedure TMainForm.SynEdit1Change(Sender: TObject);
 begin
   // Set the "Changed" mark:
   MainStatusBar.Panels[0].Text := '* ' + currentGroffFileName;
   unsavedChanges := True;
@@ -346,21 +330,23 @@
 
   // - Enforce UTF-8:
   buildOpts := buildOpts + ' -Kutf8';
 
   // - Preprocessors:
-  if chkChem.Checked then   buildOpts := buildOpts + ' -chem';
-  if chkEqn.Checked then    buildOpts := buildOpts + ' -eqn';
-  if chkGrn.Checked then    buildOpts := buildOpts + ' -grn';
-  if chkPic.Checked then    buildOpts := buildOpts + ' -pic';
-  if chkRefer.Checked then  buildOpts := buildOpts + ' -refer';
-  if chkTbl.Checked then    buildOpts := buildOpts + ' -tbl';
+  if chkBoxPreprocessors.Checked[0] then   buildOpts := buildOpts + ' -chem';
+  if chkBoxPreprocessors.Checked[1] then   buildOpts := buildOpts + ' -eqn';
+  if chkBoxPreprocessors.Checked[2] then   buildOpts := buildOpts + ' -grn';
+  if chkBoxPreprocessors.Checked[3] then   buildOpts := buildOpts + ' -pic';
+  if chkBoxPreprocessors.Checked[4] then   buildOpts := buildOpts + ' -refer';
+  if chkBoxPreprocessors.Checked[5] then   buildOpts := buildOpts + ' -tbl';
+
+  if chkBoxExtras.Checked[0] then  buildOpts := buildOpts + ' -mhdtbl';
 
   // - PDF-specifics:
   if rdPdf.Checked then begin
     buildOpts := buildOpts + ' -Tpdf';
-    if chkPdfMark.Checked then buildOpts := buildOpts + ' -mpdfmark';
+    if chkBoxExtras.Checked[1] then buildOpts := buildOpts + ' -mpdfmark';
     outputFileName := currentGroffFilePath + '.pdf';
   end
   else outputFileName := currentGroffFilePath + '.ps';
 
   // - Input file:
@@ -437,17 +423,18 @@
 procedure TMainForm.btnSaveSettingsClick(Sender: TObject);
 begin
   // Store the build settings:
   iniStorage.WriteString('BuildChosenMacro', cmbMacro.Text);
   iniStorage.WriteBoolean('BuildLogFile', chkLogFile.Checked);
-  iniStorage.WriteBoolean('BuildUseChem', chkChem.Checked);
-  iniStorage.WriteBoolean('BuildUseEqn', chkEqn.Checked);
-  iniStorage.WriteBoolean('BuildUseGrn', chkGrn.Checked);
-  iniStorage.WriteBoolean('BuildUsePic', chkPic.Checked);
-  iniStorage.WriteBoolean('BuildUseRefer', chkRefer.Checked);
-  iniStorage.WriteBoolean('BuildUseTbl', chkTbl.Checked);
-  iniStorage.WriteBoolean('BuildUsePdfMark', chkPdfMark.Checked);
+  iniStorage.WriteBoolean('BuildUseChem', chkBoxPreprocessors.Checked[0]);
+  iniStorage.WriteBoolean('BuildUseEqn', chkBoxPreprocessors.Checked[1]);
+  iniStorage.WriteBoolean('BuildUseGrn', chkBoxPreprocessors.Checked[2]);
+  iniStorage.WriteBoolean('BuildUsePic', chkBoxPreprocessors.Checked[3]);
+  iniStorage.WriteBoolean('BuildUseRefer', chkBoxPreprocessors.Checked[4]);
+  iniStorage.WriteBoolean('BuildUseTbl', chkBoxPreprocessors.Checked[5]);
+  iniStorage.WriteBoolean('BuildUseHdtbl', chkBoxExtras.Checked[0]);
+  iniStorage.WriteBoolean('BuildUsePdfMark', chkBoxExtras.Checked[1]);
   iniStorage.WriteBoolean('BuildToPostscript', rdPs.Checked);
   iniStorage.WriteBoolean('BuildToPDF', rdPDF.Checked);
 
   // Store the IDE settings:
   iniStorage.WriteBoolean('AutoSaveBuildSettings', chkAutoSaveBuildSettings.Checked);