156 lines
2.1 KiB
Bash
Executable File
156 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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##############################
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# name: gendl
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# lisc: gnu gplv3
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# desc: download to stdout or
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# file, independent of
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# a specific downloader.
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# ftp/wget/curl support.
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# main: jadedctrl
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##############################
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# usage: gendl [-o output] url
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#---------------------------------------
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# backend bits
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# NIL --> STRING
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# return the download program you're using
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function download_program
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{
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programs="ftp curl wget"
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current=""
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for program in $programs
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do
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if whereis $program > /dev/null
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then
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current=$program
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fi
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done
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if uname -s | grep -e "LibertyBSD" -e "OpenBSD" > /dev/null
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then
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current="ftp"
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fi
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echo "$current"
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}
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# STRING PATH --> NIL
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# download URL $1 to stdout
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function download_stdout
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{
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program=$(download_program)
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url=$1
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case "$program" in
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"ftp")
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output="$(ftp -VMo- $url)"
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;;
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"curl")
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output="$(curl $url)"
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;;
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"wget")
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output="$(wget --quiet -O $url)"
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;;
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esac
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return_code=$?
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echo "$output"
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return $return_code
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}
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# STRING PATH --> NIL
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# download URL $1 to path $2
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function download_file
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{
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program=$(download_program)
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url=$1
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path=$2
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case "$program" in
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"ftp")
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ftp -VMU "." -o $path $url
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;;
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"curl")
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curl -o $path $url
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;;
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"wget")
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wget --quiet -O $path $url
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;;
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esac
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return_code=$?
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if test $return_code -ne 0
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then
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rm $path 2> /dev/null
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# for consistency in behavior; wget saves 404s anyway, whereas
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# ftp doesn't save anything from 404s, etc.
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fi
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return $return_code
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}
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# --------------------------------------
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# front-end string-manip
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# STRING --> STRING
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# return the last word in a string
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function last_word
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{
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string="$1"
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echo "$string" \
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| rev \
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| sed 's% .*%%' \
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| rev
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}
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function usage
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{
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echo "usage: gendl [-o output] URL"
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}
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# --------------------------------------
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# invocation
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args="$(getopt o: $*)"
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if test $? -ne 0 || test -z "$@"
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then
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usage
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exit 2
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fi
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set -- $args
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while test $# -ne 0
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do
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case "$1"
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in
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-o)
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download_path="$2"; shift; shift;;
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--)
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shift; break;;
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esac
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done
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url="$(last_word "$@")"
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if test -n "$download_path"
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then
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download_file $url $download_path
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else
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download_stdout "$url"
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fi
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