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name : update-fonts-alias
 #!/bin/sh

# $Id: update-fonts-alias 189 2005-06-11 00:04:27Z branden $

# This program compiles fonts.alias files for X font directories; see
# mkfontdir(1x) for a description of the format of fonts.alias files.

# Copyright 1999, 2001, 2002, 2004 Branden Robinson.
# Copyright 2006 Steve Langasek.
# Licensed under the GNU General Public License, version 2.  See the file
# /usr/share/common-licenses/GPL or <https://www.gnu.org/copyleft/gpl.txt>.

PROGNAME=${0##*/}

# Query the terminal to establish a default number of columns to use for
# displaying messages to the user.  This is used only as a fallback in the event
# the COLUMNS variable is not set.  ($COLUMNS can react to SIGWINCH while the
# script is running, and this cannot, only being calculated once.)
DEFCOLUMNS=$(stty size 2>/dev/null | awk '{print $2}') || true
if ! expr "$DEFCOLUMNS" : "[[:digit:]]\+$" >/dev/null 2>&1; then
    DEFCOLUMNS=80
fi

# Display a message, wrapping lines at the terminal width.
message () {
    echo "$*" | fmt -t -w ${COLUMNS:-$DEFCOLUMNS}
}

# Display a warning message.
warn () {
    message "warning: $*" >&2
}

# Display an error message and exit.
die () {
    message "fatal error: $*" >&2
    exit 1
}

# Display a usage message.
usage () {
    if [ -n "$*" ]; then
        message "usage error: $*"
    fi
    cat <<EOF
Usage: $PROGNAME [OPTIONS] DIRECTORY ...
       $PROGNAME { -h | --help }
This program combines X font alias information from several packages into a
single file that is placed in each specified X font directory DIRECTORY.  This
utility is primarily useful to Debian package maintainer scripts.  See
update-fonts-alias(8) for more information.
Options:
    -h, --help                        display this usage message and exit
    -i, --include ALIAS-FILE          drop ALIAS-FILE from exlude list if any
    -x, --exclude ALIAS-FILE          add ALIAS-FILE to exclude list
EOF
}

X11R7_LAYOUT=
INCLUDE_ALIAS=
EXCLUDE_ALIAS=
EXCLUDE_CONF=/var/lib/xfonts/excluded-aliases

# Validate options.
while [ $# -gt 0 ]; do
    case "$1" in
        -h|--help)
            usage
            exit 0
            ;;
        -7|--x11r7-layout)
            X11R7_LAYOUT=true
            shift
            ;;
        -i|--include)
            if [ $# -lt 2 ]; then
                usage "alias file to include is missing" >&2
                exit 2
            fi
            INCLUDE_ALIAS="$INCLUDE_ALIAS $2"
            shift 2
            ;;
        -x|--exclude)
            if [ $# -lt 2 ]; then
                usage "alias file to exclude is missing" >&2
                exit 2
            fi
            EXCLUDE_ALIAS="$EXCLUDE_ALIAS $2"
            shift 2
            ;;
        -*)
            usage "unrecognized option" >&2
            exit 2
            ;;
        *)
            break
            ;;
    esac
done

if [ $# -eq 0 ]; then
    usage "one or more font directories must be specified" >&2
    exit 2
fi

# Remove aliases to be included from exclude list
for f in $INCLUDE_ALIAS; do
    sed -i "\\,^$f$,d" $EXCLUDE_CONF
done
# Add aliases to be excluded to exclude list
for f in $EXCLUDE_ALIAS; do
    sed -i "\\,^$f$,d" $EXCLUDE_CONF
    echo "$f" >> $EXCLUDE_CONF
done

while [ -n "$1" ]; do
    # Try to be clever about the argument; were we given an absolute path?
    if expr "$1" : "/.*" >/dev/null 2>&1; then
        # Yes; an absolute path to an X font directory was provided.
        X11R7DIR=$1
        ETCDIR=/etc/X11/fonts/${X11R7DIR##*/}
        ETC7DIR=/etc/X11/fonts/X11R7/${X11R7DIR##*/}
        if [ "$X11R7DIR" = "$ETCDIR" ] || [ "$X11R7DIR" = "$ETC7DIR" ]; then
            # We were given an /etc directory as an argument.
            die "path to X font directory must be used"
        else
            warn "absolute path $X11R7DIR was provided"
        fi
    else
        # No; a relative path was provided -- assume we were given just the
        # basename.
        X11R7DIR=/usr/share/fonts/X11/$1
        ETCDIR=/etc/X11/fonts/$1
        ETC7DIR=/etc/X11/fonts/X11R7/$1
    fi

    shift

    # Confirm that the directories to be operated on exist.
    VALIDSRC=
    if [ -d "$ETCDIR" ]; then
        VALIDSRC=yes
    else
        warn "$ETCDIR does not exist or is not a directory"
    fi
    if [ -d "$ETC7DIR" ]; then
        VALIDSRC=yes
    else
        if [ -n "$X11R7_LAYOUT" ]; then
            warn "$ETC7DIR does not exist or is not a directory"
        fi
    fi

    VALIDDEST=
    if [ -d "$X11R7DIR" ]; then
            VALIDDEST=yes
    else
        warn "$X11R7DIR does not exist or is not a directory"
    fi

    if [ -z "$VALIDSRC" ] || [ -z "$VALIDDEST" ]; then
        continue
    fi

    if [ -n "$X11R7DIR" ] && [ -d "$X11R7DIR" ]; then
        # Write the new alias file in a temporary location in case we are
        # interrupted.
        cat >"$X11R7DIR/fonts.alias.update-new" <<EOF
!! fonts.alias -- automatically generated file.  DO NOT EDIT.
!! To modify, see update-fonts-alias(8).
EOF
        has_data=0
        for FILE in "$ETCDIR"/*.alias "$ETC7DIR"/*.alias; do
            [ -e "$FILE" ] || continue

            # Skip excluded aliases
            grep -q "^$FILE$" $EXCLUDE_CONF && continue

            echo "!! $FILE" >>"$X11R7DIR/fonts.alias.update-new"
            cat "$FILE" >>"$X11R7DIR/fonts.alias.update-new"
            has_data=1
        done
        if [ $has_data -eq 1 ]; then
          mv "$X11R7DIR/fonts.alias.update-new" "$X11R7DIR/fonts.alias"
        else
          rm -f "$X11R7DIR/fonts.alias.update-new"
          # There are no files to process; remove any alias file already in
          # the font directory.
          rm -f "$X11R7DIR/fonts.alias"
          # Remove the font directory if it is empty.
          rmdir "$X11R7DIR" >/dev/null 2>&1 || true
        fi
    fi
done

exit 0

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