# ----------------------------------------------------------------------
# Setup flags/vars for SDL, screen dpi, and Android.
# ----------------------------------------------------------------------

namespace eval ::tk {
    variable sdltk [expr {[info command "sdltk"] eq "sdltk"}]
    variable dpi
    set dpi [winfo screenmmwidth .]
    if {$dpi <= 0} {
	# Observed in X on Wayland in a VM, provide fallback
	set dpi 75
    } else {
	set dpi [expr {int((25.4 * [winfo screenwidth .]) / $dpi)}]
    }
    variable android 0
    if {$sdltk} {
	set android [sdltk android]
    }
}

# ----------------------------------------------------------------------

    */
    display = XkbOpenDisplay((char *)displayNameStr, &event, &error, &major,
	    &minor, &reason);

    if (display == NULL) {
	/*fprintf(stderr,"event=%d error=%d major=%d minor=%d reason=%d\nDisabling xkb\n",
	event, error, major, minor, reason);*/
	display = XOpenDisplay(displayNameStr);
    } else {
	use_xkb = TK_DISPLAY_USE_XKB;
	/*fprintf(stderr, "Using xkb %d.%d\n", major, minor);*/
    }

    if (display == NULL) {
	return NULL;
    }
    dispPtr = ckalloc(sizeof(TkDisplay));
    memset(dispPtr, 0, sizeof(TkDisplay));
    dispPtr->display = display;
    dispPtr->flags |= use_xkb;
#ifdef TK_USE_INPUT_METHODS
    OpenIM(dispPtr);
    XRegisterIMInstantiateCallback(dispPtr->display, NULL, NULL, NULL,
	    InstantiateIMCallback, (XPointer) dispPtr);
#endif
    Tcl_CreateFileHandler(ConnectionNumber(display), TCL_READABLE,
	    DisplayFileProc, dispPtr);

    /*
     * Observed weird WidthMMOfScreen() in X on Wayland on a
     * Fedora 30/i386 running in a VM. Fallback to 75 dpi,
     * otherwise many other strange things may happen later.
     */
    if (WidthMMOfScreen(DefaultScreenOfDisplay(display)) <= 0) {
	int mm;

	mm = (WidthOfScreen(DefaultScreenOfDisplay(display)) * 25.4) / 75.0;
	WidthMMOfScreen(DefaultScreenOfDisplay(display)) = mm;
    }
    if (HeightMMOfScreen(DefaultScreenOfDisplay(display)) <= 0) {
	int mm;

	mm = (HeightOfScreen(DefaultScreenOfDisplay(display)) * 25.4) / 75.0;
	HeightMMOfScreen(DefaultScreenOfDisplay(display)) = mm;
    }

    /*
     * Key map info must be available immediately, because of "send event".
     */
    TkpInitKeymapInfo(dispPtr);

    return dispPtr;

1 {h3 "Taygete Scrap Book Cheat Sheet"} 2 {h4 "Important (internal) global variables"} 3 {table 1 [info global {[A-Z]*}]} 4 {#HTML
<dl>
 <dt><b>ID</b></dt>
 <dd>The current input field during evaluation, an integer number.</dd>
 <dt><b>W</b></dt>
 <dd>The Webview for displaying the page.</dd>
 <dt><b>H</b></dt>
 <dd>The history array of input fields, keys are integer numbers starting from 1.</dd>
</dl>} 5 {# current state of history array
table 2 [array get H]} 6 {h4 "Useful procs in the global namespace"} 7 {info proc *} 8 {#HTML
<dl>
 <dt><code><b>parray</b> arrayname ?pattern?</code></dt>
 <dd>Pretty print an array using <code><b>puts</b></code> and thus outputs
     after the corresponding input field.</dd><br>
 <dt><code><b>htmlraw</b> html ?hidden?</code></dt>
 <dd>Output raw HTML after the corresponding input field, if <code>hidden</code>
     is true, auto-hide the input field.</dd><br>
 <dt><code><b>gets</b></code>, <code><b>read</b></code></dt>
 <dd>Overriden, reading from <code>stdin</code> channel yields empty
     string.</dd><br>
 <dt><code><b>puts</b></code></dt>
 <dd>Overriden, writing to <code>stdout</code>/<code>stderr</code> channels
     outputs after the corresponding input field.</dd><br>
 <dt><code><b>h1</b> string</code>, <code><b>h2..h5</b></code></dt>
 <dd>Format a HTML header after the correspondig input field, auto-hide
     the input field.</dd><br>
 <dt><code><b>hr</b></code></dt>
 <dd>Format a horizontal ruler, auto-hide the input field.</dd><br>
 <dt><code><b>img</b> ?filename import mime?</code></dt>
 <dd>Format a HTML IMG given <code>filename</code>, if file name omitted,
     present file selection. If <code>import</code> is true, the image is
     inlined. If the mime type of the image is unknown it can be specified
     with the <code>mime</code> parameter.</dd><br>
 <dt><code><b>img_from_binary</b> data mime ?hidden?</code></dt>
 <dd>Format a HTML IMG given the byte array <code>data</code> and mime
     type <code>mime</code>. If <code>hidden</code> is false, the corresponding
     input field is not auto-hidden.</dd><br>
 <dt><code><b>table</b> ncols data</code></dt>
 <dd>Format a HTML table, <code>ncols</code> gives the number of columns,
     if negative, use the first <code>-ncols</code> items as header columns.</dd>
</dl>} 9 {h4 "Useful procs in the tsb namespace"} 10 {info proc tsb::*} 11 {#HTML
<dl>
 <dt><code><b>tsb::load</b> ?filename?</code></dt>
 <dd>Load page from given <code>filename</code>, if file name omitted, present file selection.</dd><br>
 <dt><code><b>tsb::save</b> ?filename?</code></dt>
 <dd>Save page to given <code>filename</code>, if file name omitted, present file selection.</dd><br>
 <dt><code><b>tsb::canvas</b> ?-width w -height h?</code></dt>
 <dd>Creates a <code>canvas</code> emulation implementing enough methods for Plotchart, returns a widget command.</dd><br>
 <dt><code><b>tsb::canvascmd</b> cmd ...</code></dt>
 <dd>Implementation of the canvas widget command, supports <code>create</code>, <code>delete</code> and other methods plus method <code>svg</code> which renders the canvas as SVG after the corresponding input field.</dd><br>
 <dt><code><b>tsb::clear</b></code></dt>
 <dd>Clears the entire page.</dd><br>
 <dt><code><b>tsb::eval</b> id</code></dt>
 <dd>Re-evaluates field with number <code>id</code>.</dd><br>
 <dt><code><b>tsb::print</b></code></dt>
 <dd>Opens the print dialog to print the page.</dd>
</dl>} 12 {h4 "Input Fields"} 13 {#HTML
<p>Input fields have a label of the form <code>in(&lt;number&gt;)</code> where the
number is the index in the history array. Arbitraty text can be entered which
however should be valid Tcl code, except the very first line is <code>#HTML</code>
or <code>#MARKDOWN</code>, in which case the following lines should be valid HTML
or Markdown text, respectively. The input field is evaluated when
<code>&lt;Shift&gt;-&lt;Return&gt;</code> is pressed.</p>

<p>Depending on the command evaluation the input field is sometimes hidden.
A double click on the corresponding output field(s) makes the input field visible
and thus editable, again.</p>} 14 {h4 "Output Fields"} 15 {#HTML
<p>Each input field has two corresponding output fields which are visible/non-empty
depending on context. One output field receives preformatted text, either the result
or the error message of a command evaluation. The other output field receives HTML,
e.g. for displaying an image or for the <code>#HTML</code> form from the input field.</p>} 16 {tsb::save cheatsheet.tsb}

# Load webview and other stuff.

package require twv
package require Markdown

# On MacOSX we need Tk early, otherwise crashes occur.

if {$tcl_platform(os) eq "Darwin"} {
    package require Tk
}

	set n [string first "\n" $str]
	if {$n > 4} {
	    incr n
	    set str [string range $str $n end]
	}
	$::W call Wraw $id $str 1
	$::W call Inhide $id 1
	set newfield 1
    } elseif {[string first "#MARKDOWN" $str] == 0} {
	set n [string first "\n" $str]
	if {$n > 8} {
	    incr n
	    set str [string range $str $n end]
	}
	set str [Markdown::convert $str]
	$::W call Wraw $id $str 1
	$::W call Inhide $id 1
	set newfield 1
    } elseif {[catch {uplevel \#0 $str} ret opts]} {
	if {[dict get $opts -code] == 4} {
	    # continue
	    $::W call Wclear $id
	} else {
	    $::W call Werror $id $::errorInfo