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1
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#!/bin/sh
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# Expands bash-style {} expressions.
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# See <http://www.gnu.org/software/bash/manual/bash.html#Brace-Expansion>.
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# Filters each line from stdin to stdout.
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# Warning: Due to shell limitations, a blank line will be interpreted as EOF.
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6
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sedEreFlag="$(test "$(uname)" = Darwin && echo E || echo r)"
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8
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sed () { "$(which sed)" -"$sedEreFlag" "$@";}
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10
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echoEach () { local line; for line in "$@"; do echo "$line"; done; }
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12
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braceKeepRe="./'{'"
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braceKeepRepl="./{"
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15
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while true; do
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17
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line="$(head -1)" # get next line from stdin; $() strips trailing newlines
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test -z "$line" && break # EOF if no line or empty line
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line="$(echo "$line"|sed -e "s/[^{,}]+/'&'/g")" # escape special chars
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line="${line//$braceKeepRe/$braceKeepRepl}" # don't expand ./{
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21
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eval "echoEach $line" # brace-expand $line
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done
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