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/usr/share/staden/scripts/assemble4 is in staden-common 2.0.0+b11-2.

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#!/bin/sh
#
# Suitable for Version 1996.3 onwards
#
# Script to assemble data into a gap4 database using a file of file
# names. No vector screening is performed.

# Startup gap4 with this script. The backslash here fools tcl into thinking
# the next line is a comment, thus enabling the script to be both bourne shell
# and tcl compatible. \
exec stash "$0" ${@+"$@"} || exit 1

proc open_database {name} {
    if {[set dot [string last . $name]] == -1} {
        puts "ERROR: Invalid database name '$name'"
        return ""
    }
    set db_name [string range $name 0 [expr $dot-1]]
    set version_num [string range $name [expr $dot+1] end]

    if {[file exists $name.BUSY]} {
	puts "ERROR: Database is busy"
	return ""
    }

    # Make backup if the database already exists.
    if {[file exists $name]} {
	exec cp $name $db_name.X
        exec cp $name.aux $db_name.X.aux
	set c 0
    } else {
	set c 1
    }

    return [open_db -name $db_name -version $version_num -access rw -create $c]
}

# Set up the gap4 defaults
load_package gap

# Turn off the annoyance bell ringing when writing readings to the fail file
error_bell 0

# Check arguments
if {$argc != 2 && $argc != 3} {
    puts "Usage: assemble database.version file_of_filenames {failure_file}"
    exit 1
}
set dbname [lindex $argv 0]
set fofn   [lindex $argv 1]
if {$argc == 3} {
    set fails [lindex $argv 2]
} else {
    set fails $fofn.fails
}

# Open the database
if {[set io [open_database $dbname]] == ""} {
    puts "ERROR: Couldn't open database '[lindex $argv 0]'"
    exit 1
}

# Shotgun assembly
set result [assemble_shotgun \
	-io $io \
	-files [ListLoad $fofn files] \
	-min_match     [keylget gap_defs AUTO_ASSEMBLE.MINMATCH.VALUE] \
	-max_pads      [keylget gap_defs AUTO_ASSEMBLE.MAXPADS.VALUE] \
	-max_pmismatch [keylget gap_defs AUTO_ASSEMBLE.MISMATCH.VALUE]]
ListCreate2 fails $result
ListSave $fails fails

# Close the database
close_db -io $io

exit