# Local preferences functions for Insight.
# Copyright 1997, 1998, 1999, 2002, 2003 Red Hat
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License (GPL) as published by
# the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.


# On STARTUP:
# 1. Options database (.Xdefaults on Unix  or ? on Windows) is read
# 2. GDB prefs file is read ("gdbtk.ini" on Windows; ".gdbtkinit" on Unix)
# 3. GDB init script is read
#
# Normally all preferences will be set in the prefs file, which is
# a generated file.  Hand-editing, if necessary, should be done to the
# GDB init script.
#
# when "save options" is selected, the contents of the
# preferences array is written out to the GDB prefs file.
#
# Usage:
#   pref_save
#   pref_read
# ----------------------------------------------------------------------
#

proc pref_read {} {
  global prefs_init_filename env gdb_ImageDir GDBTK_LIBRARY GDBStartup
  global tcl_platform

  if {[info exists env(HOME)]} {
    if {$tcl_platform(platform) == "windows" && [llength [info commands ide_cygwin_path]]} {
      set home [ide_cygwin_path to_win32 $env(HOME)]
    } else {
      set home $env(HOME)
    }
  } else {
    set home ""
  }

  if {$tcl_platform(platform) == "windows"} {
    set prefs_init_filename "gdbtk.ini"
  } else {
    set prefs_init_filename ".gdbtkinit"
  }

  if {!$GDBStartup(inhibit_prefs)} {
    set file_opened 0
    if {[file exists $prefs_init_filename]} {
      if {[catch {open $prefs_init_filename r} fd]} {
	dbug E "$fd"
	return
      }
      set file_opened 1
    } elseif {$home != ""} {
      set name [file join $home $prefs_init_filename]
      if {[file exists $name]} {
	if {[catch {open $name r} fd]} {
	  dbug E "$fd"
	  return
	}
	set prefs_init_filename $name
	set file_opened 1
      }
    }

    if {$file_opened == "1"} {
      set section gdb
      set version 0
      while {[gets $fd line] >= 0} {
	switch -regexp -- $line {
	  {^[ \t\n]*#.*} {
	    # Comment.  We recognize one magic comment that includes
	    # the version number.
	    if {[regexp -- "^# GDBtkInitVersion: (\[0-9\]+)\$" $line \
		   dummy v]} {
	      set version $v
	    }
	  }

	  {^[ \t\n]*$} {
	    ;# empty line; ignore it
	  }

	  {^[ \t\n]*\[.*\]} {
	    regexp {\[(.*)\]} $line match section
	  }

	  {^[ \t\n]*option.*} {
	    set line [string trimleft $line]
	    eval $line
	  }

	  default {
	    set a ""
	    set name ""
	    set val ""
	    regexp "\[ \t\n\]*\(.+\)=\(.+\)" $line a name val
	    if {$a == "" || $name == ""} {
	      dbug W "Cannot parse line: $line"
	    } else {
	      # Must unescape equal signs in val
	      set val [unescape_value $val $version]
	      if {$section == "gdb"} {
		pref setd gdb/$name $val
	      } elseif {$section == "global" && [regexp "^font/" $name]} {
		set name [split $name /]
		set f global/
		append f [join [lrange $name 1 end] /]
		if {[lsearch [font names] $f] == -1} {
		  # new font
		  eval define_font $f $val
		} else {
		  # existing font
		  pref set global/font/[join [lrange $name 1 end] /] $val
		}
	      } elseif {$section == "global"} {
		pref setd $section/$name $val
	      } else {
		# backwards compatibility. recognize old src-font name
		if {$val == "src-font"} {set val "global/fixed"}
		pref setd gdb/$section/$name $val
	      }
	    }
	  }
	}
      }
      close $fd
    } elseif {$home != ""} {
      set prefs_init_filename [file join $home $prefs_init_filename]
    }
    
    # now set global options
    set gdb_ImageDir [file join $GDBTK_LIBRARY [pref get gdb/ImageDir]]

  }

  # finally set colors, from system if possible
  pref_set_colors $home
}

# ------------------------------------------------------------------
#  PROC:  pref_save - save preferences to a file and delete window
# ------------------------------------------------------------------
proc pref_save {{win {}}} {
  global prefs_init_filename GDBStartup

  if {!$GDBStartup(inhibit_prefs)} {
    debug "pref_save $prefs_init_filename"

    if {[catch {open $prefs_init_filename w} fd]} {
      debug "ERROR: $fd"
      return
    }
    
    puts $fd "\# GDBtk Init file"
    puts $fd {# GDBtkInitVersion: 1}

    set plist [pref list]
    # write out global options
    puts $fd "\[global\]"
    foreach var $plist {
      set t [split $var /]
      if {[lindex $t 0] == "global"} {
	set x [join [lrange $t 1 end] /]
	set v [escape_value [pref get $var]]

	if {$x != "" && $v != ""} {
	  puts $fd "\t$x=$v"
	}
      }
    }

    # write out gdb-global options
    puts $fd "\[gdb\]"
    foreach var $plist {
      set t [split $var /]
      # We use the funny join/lreplace code because the session code
      # can generate a key where [lindex $t 2] is empty but there is
      # still stuff after that.  This happens because the session code
      # uses filenames, which can start with `/'.
      if {[lindex $t 0] == "gdb"
	  && [string compare [join [lreplace $t 0 1] /] ""] == 0} {
	set x [lindex $t 1]
	set v [escape_value [pref get $var]]
	if {$x != "" && $v != ""} {
	  puts $fd "\t$x=$v"
	}
      }
    }

    # now loop through all sections writing out values
    # FIXME: this is broken.  We should discover the list
    # dynamically.
    lappend secs load console src reg stack locals watch bp search \
      process geometry help browser kod window session mem

    foreach section $secs {
      puts $fd "\[$section\]"
      foreach var $plist {
	set t [split $var /]
	if {[lindex $t 0] == "gdb" && [lindex $t 1] == $section} {
	  set x [join [lrange $t 2 end] /]
	  set v [escape_value [pref get $var]]
	  if {$x != "" && $v != ""} {
	    puts $fd "\t$x=$v"
	  }
	}
      }
    }
    close $fd
  }

  if {$win != ""} {
    $win delete
  }
}

# -------------------------------------------------------
#  PROC: escape_value - escape all equal signs for saving
#         prefs to a file
# -------------------------------------------------------
proc escape_value {val} {
  # We use a URL-style quoting.  We encode `=', `%', the `[]'
  # characters and newlines.  We use a cute trick here: we regsub in
  # command expressions which we then expand using subst.
  if {[info tclversion] >= 8.1} {
    set expr {([\[\]=%\n])}
  } else {
    set expr "(\[\]\[=%\n\])"
  }
  regsub -all -- $expr $val \
    {[format "%%%02x" [scan {\1} %c x; set x]]} newval
  return [subst -nobackslashes -novariables $newval]
}

# -------------------------------------------------------
#  PROC: unescape_value - unescape all equal signs for
#         reading prefs from a file.  VERSION is the version
#         number of the encoding.
#  version 0 only encoded `='.
#  version 1 correctly encoded more values
# -------------------------------------------------------
proc unescape_value {val version} {
  switch -exact -- $version {
    0 {
      # Old-style encoding.
      if {[regsub -all -- {!%} $val = newval]} {
	return $newval
      }
    }

    1 {
      # Version 1 uses URL encoding.
      regsub -all -- "%(..)" $val \
	{[format %c 0x\1]} newval
      return [subst -nobackslashes -novariables $newval]
    }

    default {
      error "Unknown encoding version $version"
    }
  }

  return $val  
}

# ------------------------------------------------------------------
#  PROC:  pref_set_defaults - set up default values
# ------------------------------------------------------------------
proc pref_set_defaults {} {
  global GDBTK_LIBRARY tcl_platform gdb_ImageDir
  debug

  # Gdb global defaults
  pref define gdb/ImageDir                images2
  set gdb_ImageDir [file join $GDBTK_LIBRARY [pref get gdb/ImageDir]]
  pref define gdb/font_cache              ""
  pref define gdb/mode                    0;     # 0 no tracing, 1 tracing enabled
  pref define gdb/control_target          1;     # 0 can't control target (EMC), 1 can
  pref define gdb/B1_behavior             1;     # 0 means set/clear breakpoints,
  # 1 means set/clear tracepoints.
  pref define gdb/use_icons		  1;	 # For Unix, use gdbtk_icon.gif as an icon
  # some window managers can't deal with it.

  # OS compatibility. Valid values are "Windows", "GNOME", "KDE", and "default"
  if {$tcl_platform(platform) == "windows"}  {
    pref define gdb/compat	"Windows"
  } elseif {$tcl_platform(platform) == "unix"}  {
    pref define gdb/compat	"GNOME"
  } else {
    pref define gdb/compat	"default"
  }
  
  # set download and execution options
  pref define gdb/load/verbose 0
  pref define gdb/load/main 1
  pref define gdb/load/exit 1
  pref define gdb/load/check 0
  pref define gdb/load/bp_at_func 0
  pref define gdb/load/bp_func ""
  pref define gdb/load/baud 38400
  if {$tcl_platform(platform) == "windows"}  {
    pref define gdb/load/port com1
  } else {
    pref define gdb/load/port "/dev/ttyS0"
  }

  # The list of active windows:
  pref define gdb/window/active           {}

  # Console defaults
  pref define gdb/console/prompt          "(gdb) "
  pref define gdb/console/deleteLeft      1
  pref define gdb/console/wrap            0
  pref define gdb/console/prompt_fg       DarkGreen
  pref define gdb/console/error_fg        red
  pref define gdb/console/log_fg          green 
  pref define gdb/console/target_fg       blue
  pref define gdb/console/font            global/fixed

  # Source window defaults
  pref define gdb/src/PC_TAG              green
  pref define gdb/src/STACK_TAG           gold
  pref define gdb/src/BROWSE_TAG          \#9595e2
  pref define gdb/src/handlebg            red
  pref define gdb/src/bp_fg               red
  pref define gdb/src/temp_bp_fg          orange
  pref define gdb/src/disabled_fg         black
  pref define gdb/src/font                global/fixed
  pref define gdb/src/break_fg            black
  pref define gdb/src/source2_fg          navy
  pref define gdb/src/variableBalloons    1
  pref define gdb/src/trace_fg            magenta
  pref define gdb/src/tab_size            8
  pref define gdb/src/linenums		  1
  pref define gdb/src/thread_fg           pink
  pref define gdb/src/top_control	  1;	# 1 srctextwin controls on top, 0 bottom

  # Define the run button's functions. These are defined here in case
  # we do a "run" with an exec target (which never causes target.tcl to 
  # source)...
  pref define gdb/src/run_attach          0
  pref define gdb/src/run_load            0
  pref define gdb/src/run_run             1
  pref define gdb/src/run_cont            0

  # This is the disassembly flavor.  For now this is only supported on x86
  # machines.

  pref define gdb/src/disassembly-flavor  ""

  # Variable Window defaults
  pref define gdb/variable/font           global/fixed
  pref define gdb/variable/disabled_fg    gray

  # Stack Window
  pref define gdb/stack/font              global/fixed
  
  # Register Window
  pref define gdb/reg/rows                16

  # Global Prefs Dialogs
  pref define gdb/global_prefs/save_fg    red
  pref define gdb/global_prefs/message_fg white
  pref define gdb/global_prefs/message_bg red

  # Browser Window Search
  pref define gdb/search/last_symbol      ""
  pref define gdb/search/filter_mode     "starts with"

  pref define gdb/browser/hide_h          0
  pref define gdb/browser/layout	2

  # BP (breakpoint)
  pref define gdb/bp/show_threads         0

  # Help
  pref define gdb/help/browsername	""

  # Kernel Objects (kod)
  pref define gdb/kod/show_icon           0

  # Various possible "main" functions. What's for Java?
  pref define gdb/main_names              [list main MAIN___ MAIN__ cyg_user_start cyg_start ]

  # These are the classes of warning dialogs, and whether the user plans
  # to ignore them.
  pref define gdb/warnings/signal         0

  # Memory window.
  pref define gdb/mem/size 4
  pref define gdb/mem/numbytes 0
  pref define gdb/mem/format x
  pref define gdb/mem/ascii 1
  pref define gdb/mem/ascii_char .
  pref define gdb/mem/bytes_per_row 16
  pref define gdb/mem/color green
  
  # External editor.
  pref define gdb/editor ""
}

proc pref_set_colors {home} {
  # set color palette
  
  # In the past, tk widgets got their color information from Windows or
  # the X resource database.  Unfortunately Insight is a mixture of widgets 
  # from all over and was coded first in tcl and later in itcl.  So lots of 
  # color inheritance is broken or wrong. And Insight has some special color
  # requirements. We also have to deal with new Unix desktops that don't use the Xrdb.
  # To enable us to fix that without hardcoding colors, we create a color
  # array here and use it as needed to force widgets to the correct colors.
  
  global Colors tcl_platform
  debug

  # UNIX colors
  
  # For KDE3 (and probably earlier versions) when the user sets
  # a color scheme from the KDE control center, the appropriate color 
  # information is set in the X resource database.  Well, most of it 
  # is there but it is missing some settings, so we will carefully 
  # adjust things.
  #
  # For GNOME, we read .gtkrc or .gtkrc-1.2-gnome2 and parse it
  # for the color information.  We cannot really get this right,
  # but with luck we can read enough to get the colors to mostly match.

  # If there is no information, we provide reasonable defaults.
  
  # If some theme sets the text foreground and background to something unusual
  # then Insight won't be able to display sources and highlight things properly.
  # Therefore we will not change the textfg and textbg.

  switch [pref get gdb/compat] {

    "Windows" {
      debug "loading OS colors for Windows"
      set Colors(fg) SystemButtonText
      set Colors(bg) SystemButtonFace
      #set Colors(textfg) SystemWindowText
      #set Colors(textbg) SystemWindow
      set Colors(textfg) black
      set Colors(textbg) white
      set Colors(sfg) SystemHighlightText
      set Colors(sbg) SystemHighlight
      pref_set_option_db 0
    }

    "KDE" {
      debug "loading OS colors for KDE"

      pref_load_default
      # try loading "~/.gtkrc-kde"
      if {[pref_load_gnome $home [list .gtkrc-kde]]} {
	debug "loaded gnome file"
	pref_set_option_db 0
	debug "loaded option file"
      } else {
	# no .gtkrc-kde so assume X defaults have been set

	# create an empty entry widget so we can query its colors
	entry .e
	
	# text background
	# set Colors(textbg) [option get .e background {}]
	set Colors(textbg) white
	
	# text foreground
	#set Colors(textfg) [option get .e foreground {}]
	set Colors(textfg) black
	
	# background
	set Colors(bg) [option get . background {}]
	if {$Colors(bg) == ""} {set Colors(bg) lightgray}
	
	# foreground
	set Colors(fg) [option get . foreground {}]
	if {$Colors(fg) == ""} {set Colors(fg) black}
	
	# selectBackground
	set Colors(sbg) [option get .e selectBackground {}]
	if {$Colors(sbg) == ""} {set Colors(sbg) blue}
	
	# selectForeground
	set Colors(sfg) [option get .e selectForeground {}]
	if {$Colors(sfg) == ""} {set Colors(sfg) white}
	
	destroy .e
	pref_set_option_db 1
      }
    }
    
    "GNOME" {
      pref_load_default
      pref_load_gnome $home
      pref_set_option_db 0
    }

    "default" {
      pref_load_default
      pref_set_option_db 1
    }
  }
}

proc pref_load_default {} {
  global Colors
  debug "loading default colors"
  
  set Colors(textbg) white
  set Colors(textfg) black
  set Colors(bg) lightgray
  set Colors(fg) black
  
  # selectBackground
  set Colors(sbg) blue
  
  # selectForeground
  set Colors(sfg) white
}


# load GNOME colors and fonts, if possible.
proc pref_load_gnome {home {possible_names {}}} {
  debug "loading OS colors for GNOME"

  if {$possible_names == ""} {
    set possible_names {.gtkrc .gtkrc-1.2-gnome2}
  }

  set found 0
  foreach name $possible_names {
    debug "home=$home name=$name"
    set fname [file join $home $name]
    debug "fname=$fname"
    if {[file exists $fname]} {
      if {[catch {open $fname r} fd]} {
	dbug W "cannot open $fname: $fd"
	return 0
      }
      set found 1
      break
    }
  }
  if {$found} {
    set found [load_gnome_file $fd]
    close $fd
  }
  return $found
}

proc load_gnome_file {fd} {
  global Colors
  set found 0
  
  while {[gets $fd line] >= 0} {
    if {[regexp {include \"([^\"]*)} $line foo incname]} {
      debug "include $incname $found"
      if {$found == 0 && [file exists $incname]} {
	if {[catch {open $incname r} fd2]} {
	  dbug W "cannot open $incname: $fd2"
	} else {
	  set found [load_gnome_file $fd2]
	  close $fd2
	  if {$found} {
	    return $found
	  }
	}
      }
      continue
    } elseif {[regexp "\[ \t\n\]*\(.+\) = \(.+\)" $line a name val] == 0} {
      continue 
    }

    if {[regexp "\"#......\"" $val a] == 1} {
	set val [lindex $a 0]
    } else {
	set res [scan $val "\{ %f, %f, %f \}" r g b]
	if {$res != 3} {
	    continue
	}
	set r [expr int($r*255)]
	set g [expr int($g*255)]
	set b [expr int($b*255)]
	set val [format "\#%02x%02x%02x" $r $g $b]
    }

    debug "name=\"$name\"  val=\"$val\""

    # This is a bit of a hack and probably only
    # works for trivial cases.  Scan for colors and
    # use the first one found.
    switch [string trimright $name] {
      {bg[NORMAL]} {
	set found 1
	if {![info exists new(bg)]} {
	  debug "setting bg to $val"
	  set new(bg) $val
	}
      }
      {base[NORMAL]} {
	#if {![info exists new(textbg)]} {
	#  set new(textbg) $val
	#}
      }
      {text[NORMAL]} {
	#if {![info exists new(textfg)]} {
	#  set new(textfg) $val
	#}
      }
      {fg[NORMAL]} {
	if {![info exists new(fg)]} {
	  set new(fg) $val
	}
      }
      {fg[ACTIVE]} {
	if {![info exists new(afg)]} {
	  set new(afg) $val
	}
      }
      {bg[SELECTED]} {
	if {![info exists new(sbg)]} {
	  set new(sbg) $val
	}
      }
      {base[SELECTED]} {
	if {![info exists new(sbg)]} {
	  set new(sbg) $val
	}
      }
      {fg[SELECTED]} {
	if {![info exists new(sfg)]} {
	  set new(sfg) $val
	}
      }
      {fg[INSENSITIVE]} {
	if {![info exists new(dfg)]} {
	  set new(dfg) $val
	}
      }
      {bg[PRELIGHT]} {
	set Colors(prelight) $val
      }
      {base[PRELIGHT]} {
	set Colors(prelight) $val
      }
    }
  } 

  foreach c {fg bg sfg sbg dfg} {
    if {[info exists new($c)]} {
      set Colors($c) $new($c)
    }
  }
  return 1
}


# load the colors into the tcl option database
proc pref_set_option_db {makebg} {
  global Colors

  # The color of text that indicates changed items
  # We standardize on one color here so that changed
  # items don't blend into any OS color scheme
  set Colors(change) "green"

  option add *background $Colors(bg)
  option add *Text*background $Colors(textbg)
  option add *Entry*background $Colors(textbg)
  option add *foreground $Colors(fg)
  option add *Text*foreground $Colors(textfg)
  option add *Entry*foreground $Colors(textfg)

  option add *highlightBackground $Colors(bg)
  option add *selectBackground $Colors(sbg)

  if {$::tcl_platform(platform) == "unix"}  {
    option add *activeBackground $Colors(sbg)
  }

  option add *selectForeground $Colors(sfg)
  option add *Menu*activeForeground $Colors(sfg)

  if {[info exists Colors(prelight)]} {
    option add *Button*activeBackground $Colors(prelight)
  }
  if {[info exists Colors(dfg)]} {
    option add *disabledForeground $Colors(dfg)
  }
  
  if {$makebg} {
    # compute a slightly darker background color
    # and use for activeBackground and troughColor
    set bg2 [winfo rgb . $Colors(bg)]
    set dbg [format #%02x%02x%02x [expr {(9*[lindex $bg2 0])/2560}] \
	       [expr {(9*[lindex $bg2 1])/2560}] [expr {(9*[lindex $bg2 2])/2560}]]
    option add *activeBackground $dbg
    option add *troughColor $dbg
  }

  # Change the default select color for checkbuttons, etc to match 
  # selectBackground.
  if {$::tcl_platform(platform) == "unix"}  {
    option add *selectColor $Colors(sbg)
  }
}
