source: trunk/import_cif.tcl

# $Id: import_cif.tcl 1251 2014-03-10 22:17:29Z toby $

#-------------------------------------------------
# define info used in addcmds.tcl
catch {
    # make sure vars get set at global level
    global CIF
    source [file join $expgui(scriptdir) browsecif.tcl]
    set description "Crystallographic Information File (CIF)"
    set extensions .cif
    set procname ReadCIFFile
}
#-------------------------------------------------

proc ReadCIFFile {filename} {
    global expgui CIF
    set fp [open $filename r]
    pleasewait "Reading CIF file"          

    catch {destroy [set file .file]}
    toplevel $file
    #bind $file <Key-F1> "MakeWWWHelp gsas2cif.html filltemplate"
    set CIF(txt) $file.t
    grid [text $CIF(txt) -height 10 -width 80 -yscrollcommand "$file.s set"] \
            -column 0 -row 0 -sticky news
    grid [scrollbar $file.s -command "$CIF(txt) yview"] \
            -column 1 -row 0 -sticky ns
    grid columnconfig $file 0 -weight 1
    grid rowconfig $file 0 -weight 1
    # hide it
    wm withdraw $file
    set blocks [ParseCIF $CIF(txt) $filename]
    if {$blocks == ""} {
        donewait
        MyMessageBox -parent . -type ok -icon warning \
                -message "Note: no valid CIF blocks were read from file $filename"
        return 
    }
    set allblocks {}
    set coordblocks {}
    # search each block for coordinate
    for {set i 1} {$i <= $blocks} {incr i} {
        lappend allblocks $i
        global block$i
        set flag 1
        foreach id {_atom_site_fract_x _atom_site_fract_y _atom_site_fract_z} {
            if {[array name block$i $id] == ""} {set flag 0}
        }
        if $flag {lappend coordblocks $i}
    }
    donewait
    if {$coordblocks == ""} {
        MyMessageBox -parent . -type ok -icon warning \
                -message "Note: CIF $filename contains no coordinates"
        return
    }
    set expgui(choose) [lindex $coordblocks 0]
    # there is more than one appropriate block
    if {[llength $coordblocks] > 1} {
        catch {destroy .choose}
        toplevel .choose
        wm title .choose "Choose CIF Block"
        bind .choose <Key-F1> "MakeWWWHelp expguierr.html ChooseCIF"
        grid [label .choose.0 -text \
                "More than one block in CIF $filename\ncontains coordinates.\n\nSelect the block to use" \
                ] -row 0 -column 0 -columnspan 2
        set row 0
        foreach i $coordblocks {
            incr row
            set name ""
            catch {set name [set block${i}(data_)]}
            grid [radiobutton .choose.$row -value $i \
                    -text "block $i ($name)" -variable expgui(choose)] \
                    -row $row -column 0 -sticky w
        }
        grid [button .choose.browse -text CIF\nBrowser -command \
                "CallBrowseCIF $CIF(txt) [list $allblocks] [list $coordblocks] .choose.cif" \
                ] -row 1 -rowspan $row -column 1 
        grid [button .choose.ok -text OK -command "destroy .choose"] \
                -row [incr row] -column 0 -sticky w
        grid [button .choose.help -text Help -bg yellow \
            -command "MakeWWWHelp expguierr.html ChooseCIF"] \
            -column 1 -row $row -sticky e
        putontop .choose
        tkwait window .choose
        # fix grab...
        afterputontop
    }

    set i $expgui(choose)
    # get the space group
    set spg {}
    set sgnum {}
    set msg {}
    catch {
        set spg [ValueFromCIF block${i} _symmetry_space_group_name_h-m]
    }
    set cell {}
    foreach var {_cell_length_a _cell_length_b _cell_length_c \
            _cell_angle_alpha _cell_angle_beta _cell_angle_gamma} {
        # leave blank any unspecified data items
        set val {}
        catch {set val [ValueFromCIF block${i} $var]}
        lappend cell [lindex [ParseSU $val] 0]
    }
    
    set atomlist {}
    set lbllist {}
    catch {
        set lbllist [ValueFromCIF block${i} _atom_site_label]
    }
    set uisolist {}
    set Uconv 1
    catch {
        set uisolist [ValueFromCIF block${i} _atom_site_u_iso_or_equiv]
    }
    if {$uisolist == ""} {
        catch {
            set uisolist [ValueFromCIF block${i} _atom_site_b_iso_or_equiv]
            set Uconv [expr 1/(8*3.14159*3.14159)]
        }
    }
    set occlist {}
    catch {
        set occlist [ValueFromCIF block${i} _atom_site_occupancy]
    }
    set typelist {}
    catch {
        set typelist [ValueFromCIF block${i} _atom_site_type_symbol]
    }
    foreach x [ValueFromCIF block${i} _atom_site_fract_x] \
            y [ValueFromCIF block${i} _atom_site_fract_y] \
            z [ValueFromCIF block${i} _atom_site_fract_z] \
            lbl $lbllist uiso $uisolist occ $occlist type $typelist {
        # deal with defaults
        if {$occ == "" || $occ == "."} {set occ 1.0}
        if {$uiso == "" || $uiso == "."} {set uiso 0.025}
        # should not be any quotes, but remove them, if there are
        foreach var {lbl type} {
            foreach char {' \"} {
                set q {\\}
                append q $char
                set hidden [regsub -all $q [set $var] \200 $var]
                if {[string index [set $var] 0] == $char} {
                    regsub -all $char [set $var] {} $var
                }
                if {$hidden} {regsub -all \200 [set $var] $char $var}
            }
        }
        # CIF specifies types as Cu2+; GSAS uses Cu+2
        if {[regexp {([A-Za-z]+)([1-9])([+-])} $type junk elem sign val]} {
            set type ${elem}${val}$sign
        }
        # if type is missing, attempt to parse an element in the label
        if {$type == "" && $lbl != ""} {
            regexp {[A-Za-z][A-Za-z]?} $lbl type 
        }
        # get rid of standard uncertainies
        foreach var {x y z occ uiso} {
            catch {
                set $var [lindex [ParseSU [set $var]] 0]
            }
        }
        # convert Biso to Uiso (if needed)
        if {$Uconv != 1} {
            catch {set uiso [expr {$Uconv*$uiso}]} err
        }
        lappend atomlist [list $lbl $x $y $z $type $occ $uiso]
    }

    # clean up -- get rid of the CIF arrays & window
    for {set i 1} {$i <= $blocks} {incr i} {
        unset block$i
    }
    destroy $file
    return "[list $spg] [list $cell] [list $atomlist] [list $msg]"
}


proc CallBrowseCIF {txt blocklist selected frame} {
    # is there a defined list of dictionary files?
    if {[catch {set ::CIF(dictfilelist)}]} {
        set dictfilelist [glob -nocomplain \
                              [file join $::expgui(gsasdir) data *.dic]]
        foreach file $dictfilelist {
            lappend ::CIF(dictfilelist) $file
            set ::CIF(dict_$file) 1
        }
    }
    # load the initial CIF dictionaries
    LoadDictIndices
    
    BrowseCIF $txt $blocklist $selected $frame
}