#!/bin/sh
# the exec restarts using tclsh which in turn ignores
# the command because of this backslash: \
exec tclsh "$0" "$@"

#
# otcldoc - a simple script for translating otcl classes into
# an html hyperlinked document.  Inspired by javadoc.
# Basic algorithm: for a given set of input files, find all Class
# definitions.  Put the text in the comment immediately preceding the
# class def in the "description" section of the doc.
# Parse the Class definition to locate superclasses and at
# that to the "superclasses" section.  Locate each method
# labeled as instproc, public, or private, and enter desriptions
# in the "Public/Private Methods" sections of the html doc.
#
# TO-DO:
#
#   Add a cross-links for methods as Elan did for classes
#   (in format_line)
#
#   Separate public and private methods into different sections
#   of the web page. [DONE]
#
#   Add a tags section to the comment so we can include
#   "see also" refs, author info, etc.
#
#   Do more interesting html formatting of code, e.g., highlight
#   class names and add hyperlinks.
#
#   Add tags for C++ methods so they will not only be documented
#   in the OTcl module, but they will also appear in the html doc
#   in a special section.
#
#   Have a separate pass that determines all of children used by
#   a class so we can build the class interdependecnies into the 
#   doc (i.e., we should encompss more than just superclass relationships)
#	[DONE]
#
#   Add hyperlinks from method description to actual OTcl proc.
#	[DONE]
#
#   Create a top-level index.
#	[DONE - rough cut]
#
#   Add keyword or comment to set up inherits-from/overrides relationships.
#
#   Parsing of the Class definition should not assume it all fits on a single line.
#   (WidgetClass definitions, for example, often span multiple lines.)  [DONE]
#
#   Parse WidgetClass definitions, presenting available attributes and their defaults in html. 
#   i.e. Process "-configspec"/"-config" and "-default" similar to the way "-superclass" is handled.    
#
set app [pwd]
set outputDir /var/tmp/doc-[file tail [pwd]]
set indexFileName index.html
set classString Class
exec mkdir -p $outputDir
set outputChannel stdout
set nlines 0

proc emit s {
	global outputChannel
	puts $outputChannel $s
}

proc emit_nonewline s {
	global outputChannel
	puts -nonewline $outputChannel $s
}

#
# Mape an OTcl class name to an html file name
#
proc class_to_file c {
	set f ""
	# map slashes to dashes
	set sep ""
	foreach s [split $c /] {
		set f "$f$sep$s"
		set sep -
	}
	return $f.html
}

#
# Arrange for output to go to the appropriate output file.
# 
proc set_class c {
	global outputChannel outputDir
	if { $outputChannel != "stdout" } {
		close $outputChannel
	}
	set outputChannel [open $outputDir/[class_to_file $c] w]
}

#
# Arrange for output to go to the appropriate output file.
# 
proc set_generic_class {} {
	global outputChannel outputDir
	if { $outputChannel != "stdout" } {
		close $outputChannel
	}
	set outputChannel [open $outputDir/[class_to_file "Generic"] w]
}

#
# Return a list of the otcl class definitions
# found in the file.  Set up a table (called "lineOfClass")
# to map class name to line number and a table (called "methods")
# that maps a class name to a list of line numbers that
# correspond to each method of that class.
#
proc find_tcl_classes {} {
	global line nlines lineOfClass public_methods private_methods proc_methods generic_proc_methods classString 

	set classes ""
	set n 0
	while { $n < $nlines } {
		set s [split $line($n)]
		if { [lindex $s 0]  == $classString } {
			set cname [lindex $s 1]
			if { $cname != "instproc" && $cname != "proc" &&
			    $cname != "private" && $cname != "public" } {
				set classes "$classes $cname"
				set lineOfClass($cname) $n
			}
		} elseif { "[lindex $s 0]"  == "proc" } {
			lappend generic_proc_methods $n
		# if second word is one of the following, make sure the first word is not a standard tcl/tk command
		# (This is to avoid the situations where "public", "proc", etc. are used as variables sent as argument to a command)
		} elseif { [lsearch -exact [info commands {[a-z]*}] [lindex $s 0]] == -1 } {
			if { "[lindex $s 1]" == "instproc" ||
			     "[lindex $s 1]" == "public" } {
				set cname [lindex $s 0]
				lappend public_methods($cname) $n
			} elseif { "[lindex $s 1]" == "private" } {
				set cname [lindex $s 0]
				lappend private_methods($cname) $n
			} elseif { "[lindex $s 1]" == "proc" } {
				set cname [lindex $s 0]
				lappend proc_methods($cname) $n
			}
		}

		incr n
	}
	return $classes
}

proc class_anchor_name lineno {
	global line
	set s $line($lineno)
	return [lindex $s 1]
}

proc method_anchor_name lineno {
	global line
	set s $line($lineno)
	return [lindex $s 0]::[lindex $s 2]
}

proc generic_method_anchor_name lineno {
	global line
	set s $line($lineno)
	return [lindex $s 1]
}

#
# Read the important lines from input file into the "lines" array.
# While we're reading in the file, dump the code to correponsding
# output html file and insert anchors for each Class and instproc
#
proc read_tcl_file fname {
	global line nlines outputDir file classString

	set outFile $outputDir/$fname.html
	exec mkdir -p [file dirname $outFile]
	set out [open $outFile w]
	puts $out "<html><pre>"

	set cont 0
	set contClassDefn 0
	set f [open $fname r]
	while 1 {
		set rawline [gets $f]
		if [eof $f] {
			break
		}
		set s $rawline
		
		# Since we are outputting in an html <pre> section, 
		# change '<' to '&#60;' so that '<' is not interpreted
		# to be the start of a specially interpreted element,
		# such as '<s>' which means strike-through.
		regsub -all {<} $rawline {\&#60;} rawline

		set linekReset 0
		if $cont {
			set c [continuation $s]
			if { $c != "" } {
				set s $c
			} else {
				set cont 0
			}
			set k [expr $nlines - 1]
			set linekReset 1
			set oldlinek $line($k)
			set line($k) "$line($k) $s"
		} 

		# For Class definitions, read in the entire body of the definition even if it spans multiple lines.
		# To do this, we count open and closed braces.
		# The motivation for this was to be able to process the "-configuration" option of a Class definition
		# in order to display the default settings for an Object.
		if { $contClassDefn } {
			if { [is_tcl_comment $s] == 1} {
			    continue
			}

			set c [continuation $s]
			if { $c != "" } {
				set s $c
				set cont 1
			}

			set c [classDefnContinuation $s]
			global unclosedbraces
			if { $unclosedbraces > 0 } {
			    set s $c
			} else {
			    set contClassDefn 0
			}
			if { $linekReset == 1} {
			    set line($k) $oldlinek
			} else {
			    set k [expr $nlines - 1]
			}
			while { $line($k) == "" } {
			    incr k -1
			}
			set line($k) "$line($k) $s"
		}

		#
		# Strip off trailing open brace if necessary
		# (escape rules in split are too difficult otherwise)
		#
		set stringb4trim $s
		set s [string trim $s]
		if { [string last \{ $s] == [expr [string length $s] - 1] } {
			set s [string range $s 0 [expr [string length $s] - 2]]
		}
		

		set words [split $s]
		#
		# Preserve all class and method definitions in addition
		# to comments and blank lines.  (We need the blank
		# lines to server as delimeters in the logic used later.)
		#
		if { [is_tcl_comment $s] || [lindex $words 0]  == $classString ||
			[lindex $words 1] == "instproc" ||
			[lindex $words 1] == "public" ||
			[lindex $words 1] == "private" ||
			[lindex $words 1] == "proc" ||
			[lindex $words 0] == "proc" ||
				$words == "" } {

			set c [continuation $s]
			if { $c != "" } {
				set s $c
				set cont 1
			}

			#if s has configuration, read til the brace afterwards is closed into a var which i will process later
			if {[lindex $words 0] == $classString && 
			    [lindex $words 1] != "instproc" &&
			    [lindex $words 1] != "public" &&
			    [lindex $words 1] != "private" &&
			    [lindex $words 1] != "proc" &&
			    ![is_tcl_comment $s] } {
				set c [classDefnContinuation $stringb4trim]
				global unclosedbraces
				if { $unclosedbraces > 0 } {
				    set s $c
				    set contClassDefn 1
				}
			}

			set line($nlines) $s
			set file($nlines) $fname

			if { [lindex $words 0]  == $classString } {
				set anc [class_anchor_name $nlines]
				puts $out "</pre><a name=$anc><pre>"
			} elseif { [lindex $words 0] == "proc" } {
				set anc [generic_method_anchor_name $nlines]
				puts $out "</pre><a name=$anc><pre>"
			# if second word is one of the following, make sure the first word is not a standard tcl/tk command
			# (This is to avoid the situations where "public", "proc", etc. are used as variables sent as argument to a command)
			} elseif { [lsearch -exact [info commands {[a-z]*}] [lindex $words 0]] == -1 } {
				if { [lindex $words 1] == "instproc" ||
					[lindex $words 1] == "public" ||
					[lindex $words 1] == "private" ||
					[lindex $words 1] == "proc" } {
					set anc [method_anchor_name $nlines]
					puts $out "</pre><a name=$anc><pre>"
				}
			}
			incr nlines
		}
		puts $out $rawline
	}
	puts $out "</pre></html>"
	close $out
	close $f
}

#
# Like read_tcl_file, but for C++.  Doesn't bother
# generating C++ html files.
#
proc read_cpp_file fname {
	global line nlines outputDir file tcl_class classString

	set outFile $outputDir/$fname.html
	exec mkdir -p [file dirname $outFile]
	set out [open $outFile w]
	puts $out "<html><pre>"

	set f [open $fname r]
	while 1 {
		set rawline [gets $f]
		if [eof $f] {
			break
		}
		set s $rawline
		set words [split $s]
		#
		# Collect up all the TclClass names so we can
		# warn of classes that don't have structured
		# comments.
		#
		foreach w $words {
			if [string match TclClass(*) $w] {
				set s [string first \" $w]
				set e [string last \" $w]
				if { $s < 0 } {
					continue
				}
				incr s
				incr e -1
				set c [string range $w $s $e]
				# 
				set tcl_class($c) 1
				break
			}
			#XXX skip C++ methods for now.
		}

		#
		# Preserve all comments since all interesting OTcl
		# methods are defined inside C comments.
		#
		if { [is_c_comment $s] } {
			#
			# convert to tcl comment for consistency with
			# other code
			#
			set ss [convert_comment $s]
			set words [split $ss]

			set line($nlines) $ss
			set file($nlines) $fname

			if { [lindex $words 1] == "<otcl>" } {

				set ss [strip_otcl_tag $ss]
				set line($nlines) [string trimleft $ss]

				if { [lindex $words 2] == $classString } {
					set anc [class_anchor_name $nlines]
					puts $out "</pre><a name=$anc><pre>"
				} elseif { [lindex $words 3] == "instproc" ||
					[lindex $words 3] == "public" ||
					[lindex $words 3] == "private" ||
					[lindex $words 3] == "proc" } {
					set anc [method_anchor_name $nlines]
					puts $out "</pre><a name=$anc><pre>"
				} elseif { [lindex $words 2] == "proc" } {
					set anc [generic_method_anchor_name $nlines]
					puts $out "</pre><a name=$anc><pre>"
				}
			}

			incr nlines
		}
		puts $out $rawline
	}
	puts $out "</pre></html>"
	close $out
	close $f
}

proc convert_comment s {
	set s [string trimleft $s]
	if { [string index $s 0] == "*" } {
		if { [string index $s 1] == "/" } {
			#
			# terminate the comment block with a special
			# marker (#.) so we can detect it later
			#
			return "\#. [string range $s 2 end]"
		}
		return "\#[string range $s 1 end]"
	}
	#	
	# must be a "/*"
	#
	return "\#[string range $s 2 end]"
}

proc strip_otcl_tag s {
	set k [string first <otcl> $s]
	return [string range $s [expr $k + 6] end]
}

proc is_tcl_comment s {
#	if { [string index $s 0] == "#" } {
#		return 1
#	}
	if { [regexp "^\[ \t\]*#" $s] } {
		return 1
	}
	return 0
}

#
# Return true iff the string s begins with "/*", "*", ignoring
# leading whitespace.  This is not necessarily a C comment, but is
# good enough for our purposes here.
#
proc is_c_comment s {
	set s [string trimleft $s]
	if { [string index $s 0] == "*" || [string range $s 0 1] == "/*" } {
		return 1
	}
	return 0
}

#
# return null if the string does not end in backslash
# otherwise, return the string less the backslash char
#
proc continuation s {
	set k [expr [string length $s] - 1]
	if { [string index $s $k] == "\\" } {
		incr k -1
		return [string range $s 0 $k]
	}
	return ""
}

#
# return null if the string closes all the open braces
# otherwise, return the string  (NOTE that if $s is "", that is what will be returned)
#
proc classDefnContinuation s {
    global unclosedbraces
    
    if { [is_tcl_comment $s] } {
	return " "
    }

    if {![info exists unclosedbraces]} {
	set unclosedbraces 0
    }
    regsub -all {[^\{]} $s {} openers
    regsub -all {[^\}]} $s {} closers
    set openbraces [string length $openers]
    set closebraces [string length $closers]
    set ucb [expr $unclosedbraces + $openbraces - $closebraces]
    set unclosedbraces $ucb
    if { $unclosedbraces > 0 } {
	return $s
    } else {
	return ""
    }
}

proc strip s {
	set n 1
	if { [string index $s $n] == " " } {
		set n 2
	}
	return [string range $s $n end]
}

proc get_comment_block lineNo {
	global file
	if { [file extension $file($lineNo)] == ".tcl" } {
		return [get_tcl_comment_block $lineNo]
	} else {
		return [get_cpp_comment_block $lineNo]
	}
}

proc format_line l {
	global lineOfClass
	set l [strip $l]
	# set up class cross references
	set q ""
	foreach w [split $l] {
		# trim punctuation.
		set c [string trim $w ".;:?,()\{\}[]!"]
		if [info exists lineOfClass($c)] {
			set o "<a href=[class_to_file $c]>$w</a>"
		} else {
			set o $w
		}
		set q "$q $o"
	}
	return $q
}

#
# Return the comment block immediately above line number $lineNo.
# Removes leading comment characters (but does not strip whitespace
# since we probably want to preserve tabs).  But it does strip
# a single space char if present.  Assume $lineNo < $nlines.
#
proc get_tcl_comment_block lineNo {
	global line nlines
	set n $lineNo
	incr n -1

	#
	# First skip over whitespace
	#
	while { $n > 0 } {
		set s $line($n)
		if [is_tcl_comment $s] {
			break
		}
		set w [string trim $s]
		if { $w != "" } {
			# ran into non-comment, non-whitespace
			break
		}
		incr n -1
	}

	#
	# Now skip up past the comment body
	#
	while { $n > 0 } {
		set s $line($n)
		if ![is_tcl_comment $s] {
			break
		}
		incr n -1
	}

	#
	# gather up the text
	#
	set blk ""
	while 1 {
		incr n
		if { $n >= $lineNo } {
			break
		}
		set blk "$blk\n[format_line $line($n)]"
	}
	return $blk
}

#
# Just like get_tcl_comment_block but for C++.
# Note that the C++ comment has been converted to tcl
# syntax --- the only difference is the comment is
# below the method rather than above it.
#
proc get_cpp_comment_block lineNo {
	global line nlines
	set n $lineNo
	#
	# gather up the text
	# Note that we terminated the comment block 
	# with "#." when we converted from C to tcl.
	#
	set blk ""
	while 1 {
		incr n
		set s $line($n)
		if { $n >= $nlines || [string first "#." $s] >= 0 || \
			![is_tcl_comment $s] } {
			break
		}
		set blk "$blk\n[format_line $line($n)]"
	}
	return $blk
}

proc inList { list item } {
	return [expr [lsearch $list $item] >= 0]
}

proc add_class_edge { parent child } {
	global subclass
	if ![inList subclass($parent) $child] {
		lappend subclass($parent) $child
	}
}

# XXX not sure if this will do the right thing
proc copy_class { dst src } {
	global lineOfClass
	set lineOfClass($dst) $lineOfClass($src)
}


#
# compute the superclass relationships
#
proc arrange_class_hierarchy classes {
	global superclass
	foreach c $classes {
		set sc [get_superclasses $c]
		set superclass($c) $sc
		foreach super $sc {
			add_class_edge $super $c
		}
	}
}

#
# Return true iff we encountered the class definition
# of the class $c.
#
proc class_known c {
	global lineOfClass
	return [info exists lineOfClass($c)]
}


#
# Return the superclasses of a given class $c.  We no longer assume that the
# entire "-superclass" directive is on the same line as the Class keyword.
#
proc get_superclasses c {
	global line lineOfClass
	set s $line($lineOfClass($c))

	if {[regexp {\-superclass[ ]*(.*)} $s match allAfterDashSuperClass]} {
	    return [lindex $allAfterDashSuperClass 0]
	} else {
		return ""
	}
}

proc is_otcl_class c {
	global file lineOfClass
	return [string match [file extension $file($lineOfClass($c))] ".tcl"]
}

proc is_otcl_method lineno {
	global file
	return [string match [file extension $file($lineno)] ".tcl"]
}

proc emit_generic_header {} {
	global file lineOfClass private_methods public_methods proc_methods generic_proc_methods
	#XXX should dump comment that otcldoc autogen'd this
	#XXX should use paramters for link color, font etc
	if [info exists generic_proc_methods] {
		foreach l $generic_proc_methods {
			set files($file($l)) 1
		}
	}
	set flist [array names files]
	emit "\
<HTML>\n\
<HEAD>\n\
<TITLE>Object</TITLE>\n\
</HEAD>\n\
<BODY BGCOLOR=#FFFFFF TEXT=#000000 LINK=#0000FF>\n\
<h1> <i>MASH</i> Proc Methods Not Installed on a Particular Object</h1>\n\
<h2>Files</h2>
"
	foreach fname $flist {
		set flink $fname.html
		emit "\
<ul><a href=$flink>\n\
<pre>$fname</pre></a></ul>\n\
"	
	}
}

proc emit_header c {
	global file lineOfClass private_methods public_methods proc_methods 
	#XXX should dump comment that otcldoc autogen'd this
	#XXX should use paramters for link color, font etc
	if [info exists public_methods($c)] {
		foreach l $public_methods($c) {
			set files($file($l)) 1
		}
	}
	if [info exists private_methods($c)] {
		foreach l $private_methods($c) {
			set files($file($l)) 1
		}
	}
	if [info exists proc_methods($c)] {
		foreach l $proc_methods($c) {
			set files($file($l)) 1
		}
	}
	set flist [array names files]
	if { $flist == "" } {
		set flist $file($lineOfClass($c))
	}
	set tcl 0
	set cpp 0
	foreach f $flist {
		if [string match [file extension $f] ".tcl"] {
			set tcl 1
		} else {
			set cpp 1
		}
	}
	global classtype classfiles
	if { $tcl } {
		if { $cpp } {
			set cn "Split C++/OTcl Class"
			set classtype($c) split
		} else {
			set cn "OTcl Class"
			set classtype($c) otcl
		}
	} else {
		set cn "C++ Class"
		set classtype($c) c++
	}
	set classfiles($c) $flist

	emit "\
<HTML>\n\
<HEAD>\n\
<TITLE>$c Object</TITLE>\n\
</HEAD>\n\
<BODY BGCOLOR=#FFFFFF TEXT=#000000 LINK=#0000FF>\n\
<h1>$cn <u>$c</u></h1>\n\
<h2>Files</h2>
"
	foreach fname $flist {
		set flink $fname.html
		emit "\
<ul><a href=$flink>\n\
<pre>$fname</pre></a></ul>\n\
"	
	}
}

proc emit_trailer {} {
	#XXX
	emit "</HTML>"
}

proc class_link c {
	set link [class_to_file $c]
	return "<A HREF=\"$link\">$c</A>"
}

proc emit_class_list clist {
	emit "<UL>"
	set sep ""
	foreach sc $clist {
		emit_nonewline "$sep[class_link $sc]"
		set sep ",\n\t"
	}
	emit "</UL>"
}

proc emit_superclasses c {
	set scl [get_superclasses $c]
	if { $scl != "" } {
		emit "<p>\n<h2>Superclasses</h2>\n"
		emit_class_list $scl
	}
}

proc emit_subclasses c {
	global subclass
	if ![info exists subclass($c)] {
		return
	}
	emit "<p>\n<h2>Subclasses</h2>\n"
	emit_class_list $subclass($c)
}

proc emit_syntax c {
	global public_methods private_methods line file
	emit "<h2>Syntax</h2>"
	if ![info exists public_methods($c)] {
		#XXX no methods (in particular, no constructor)
		emit "<UL><B>$c::init</B><BR></UL>"
		return
	}

	#
	# find the constructor
	#
	foreach lineno $public_methods($c) {
		set s $line($lineno)
		set proc [lindex $s 2]
		if { $proc == "init" } {
			set args [lindex $s 3]
			set link $file($lineno).html\#[method_anchor_name $lineno]
			emit "<UL><a href=$link>$c::init</a> <I>$args</I><br>"
			set desc [get_comment_block $lineno]
			if { $desc != "" } {
				emit $desc
				emit "<BR>"
			}
			emit "</UL><BR>"
			return
		}
	}
	if [info exists private_methods($c)] {
		foreach lineno $private_methods($c) {
			set s $line($lineno)
			set proc [lindex $s 2]
			if { $proc == "init" } {
				emit \
		"<ul>Abstract base class.  Constructor is private.</ul>"
				return
			}
		}
	}
	emit "<ul>No constructor.</ul>"
}

#
# Lists each default configuration for this Class in a two-column format,
# the first column displaying the option-name, the second column displaying the default value.
#
proc emit_default_configuration c {
	global lineOfClass line

	# put everything from the Class defn after "-configuration " into the variable "allAfterDashConfig"
	if {[regexp {\-configuration[ ]*(\{.*)} $line($lineOfClass($c)) match allAfterDashConfig]} {
	    # put the item immediately after "-configuration " into a list variable 
	    set configuration_list [lindex $allAfterDashConfig 0]
	    if { [is_even [llength $configuration_list]] } {
		# convert the list to an array of default values, indexed by the option-names
		array set configuration_array $configuration_list
		# output a heading
		emit "\
<h2>Default Configuration</h2>\n\
"
		emit "\
<ul><b>Use the <i>add_option</i> method provided by the <i>Configuration</i> object to override these default settings:</b></ul>\n\
"
		emit "<ul><table>"
		# output the option-name & default-value pairs in a two-column format
		foreach {key value} [array get configuration_array] {
		    emit "<tr><td> $key </td><td> $value </td></tr>"
		}
		emit "</table></ul>"
	    } else {
		puts stderr "Warning: every default configuration option must have a value."
		puts stderr "Class $c has an uneven list of default configuration options: $configuration_list"
	    }
	}
}

proc is_even { num } {
    if { [expr { $num % 2 }] == 0 } {
	return 1
    } else {
	return 0
    }
}

proc emit_description c {
	global lineOfClass
	emit "\
<h2>Description</h2>\n\
"
	emit [get_comment_block $lineOfClass($c)]
}

proc emit_generic_methods { title } {
	global generic_proc_methods line file

	if ![info exists generic_proc_methods] {
		#XXX no methods
		return
	}

	emit "<H2>$title</H2>\n<UL>\n"
		
	foreach lineno [set generic_proc_methods] {
		set s $line($lineno)
		set proc [lindex $s 1]
		set args [lindex $s 2]

		if [is_otcl_method $lineno] {
			set type "(OTcl)"
		} else {
			set type "(C++)"
		}

		set link $file($lineno).html\#[generic_method_anchor_name $lineno]
		emit "<LI><a href=$link>$proc</a> <I>$args</I>$type<br>"
		set desc [get_comment_block $lineno]
		if { $desc != "" } {
			emit $desc
			emit "<br>"
		}
		emit "<br>"
	}
	emit "</UL>"
}

proc emit_methods { c scope title } {
	global $scope\_methods line file

	if ![info exists $scope\_methods($c)] {
		#XXX no methods
		return
	}

	emit "<H2>$title</H2>\n<UL>\n"
		
	foreach lineno [set $scope\_methods($c)] {
		set s $line($lineno)
		set proc [lindex $s 2]
		set args [lindex $s 3]

		if [is_otcl_method $lineno] {
			set type "(OTcl)"
		} else {
			set type "(C++)"
		}

		set link $file($lineno).html\#[method_anchor_name $lineno]
		emit "<LI><a href=$link>$proc</a> <I>$args</I>$type<br>"
		set desc [get_comment_block $lineno]
		if { $desc != "" } {
			emit $desc
			emit "<br>"
		}
		emit "<br>"
	}
	emit "</UL>"
}

proc emit_class_tree c {
	global mark subclass classtype
	if [info exists mark($c)] {
		return
	}
# If the next line is uncommented, objects that inherit from multiple parents will only be output beneath the
# parent that appears first in the tree.
#	set mark($c) 1
	emit "<li> [class_link $c]"

	switch $classtype($c) {
	split { emit "(OTcl/C++)" }
	otcl { emit "(OTcl)" }
	c++ { emit "(C++)" }
	}

	if [info exists subclass($c)] {
		foreach s [lsort $subclass($c)] {
			emit "<ul>"
			emit_class_tree $s
			emit "</ul>"
		}
	}
}

#
# Return true iff the class $c has no parents that
# have been encountered in the scan of all input files.
#
proc is_root_class c {
	global superclass
	foreach p $superclass($c)  {
		if [class_known $p] {
			return 0
		}
	}
	return 1
}

proc emit_index classes {
	emit "<html>"
	global indexHeaderFile
	if { [info exists indexHeaderFile] &&
		[file readable $indexHeaderFile] } {
		emit [exec cat $indexHeaderFile]
		emit "<hr size=2 noshade>"
	}

	set link [class_to_file "Generic"]
	emit "<br><A HREF=\"$link\">General Tcl procs</A> (<i>i.e.</i> proc methods not installed on a particular Object)" 

	#
	# Go through all the classes.  For each root class, dump
	# the class hierarchy below.  A root class is a class with
	# no parent that will be encountered in the scan.
	#
	foreach c [lsort $classes] {
		if [is_root_class $c] {
			emit "<ul>"
			emit_class_tree $c
			emit "</ul>"
		}
	}
	emit "</html>"
}

proc emit_timestamp {} {
    emit "<HR WIDTH='100%'> <CITE>Updated [exec date].</CITE>"
}

proc emit_generic_doc {} {
	emit_generic_header 
	emit_generic_methods "Procs"
	emit_trailer 
	emit_timestamp
}

proc emit_doc c {
	emit_header $c
	emit_description $c
	emit_superclasses $c
	emit_subclasses $c
	emit_syntax $c
	emit_default_configuration $c
	emit_methods $c public "Public Methods"
	emit_methods $c private "Private Methods"
	emit_methods $c proc "Proc Methods"
	emit_trailer 
	emit_timestamp
}

proc is_arg argv {
	if { $argv != "" } {
		return [string match -* [lindex $argv 0]]
	}
	return 0
}

proc fatal s {
	puts stderr "otcldoc: $s"
	exit 1
}

proc warn s {
	puts stderr "otcldoc: warning - $s"
}

proc usage {} {
	puts stderr "usage: otcldoc \[-h index-header-file] \[ -d output-dir ] \[ -i index-file-name ] \[ -c class-string ] files ..."
	exit 1
}

proc parse_args argv {
	while 1 {
		if ![is_arg $argv] {
			break
		}
		set arg [lindex $argv 0]
		set argv [lrange $argv 1 end]
		set val [lindex $argv 0]
		if { $arg == "-d" } {
			global outputDir
			set outputDir $val
			set argv [lrange $argv 1 end]
			continue
		}
		if { $arg == "-h" } {
			global indexHeaderFile
			set indexHeaderFile $val
			set argv [lrange $argv 1 end]
			continue
		}
		if { $arg == "-i" } {
			global indexFileName
			set indexFileName $val
			set argv [lrange $argv 1 end]
			continue
		}
		if { $arg == "-c" } {
			global classString
			set classString $val
			set argv [lrange $argv 1 end]
			continue
		}
		fatal "unknown command option at '$arg'"
	}
	return $argv
}

if { $argv == "" } {
	usage
}
set argv [parse_args $argv]

foreach f $argv {
	if { [file extension $f] == ".tcl" } {
		read_tcl_file $f
	} elseif { [file extension $f] == ".cc" } {
		read_cpp_file $f
	} else {
		fatal "$f: unknown file extension"
	}
}

set classes [find_tcl_classes]
arrange_class_hierarchy $classes
set_generic_class 
emit_generic_doc
foreach c $classes {
	set_class $c
	emit_doc $c
}
close $outputChannel

set outputChannel [open $outputDir/$indexFileName w]
emit_index  $classes
emit_timestamp
close $outputChannel

foreach c [array names tcl_class] {
	if ![inList $classes $c] {
		warn "no doc for C++ class $c"
	}	
}