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############################################################################
#
# File: edscript.icn
#
# Subject: Program to produce script for ed(1)
#
# Author: Ralph E. Griswold
#
# Date: March 7, 1998
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program takes specifications for global edits from standard
# input and outputs an edit script for the UNIX editor ed to standard output.
# Edscript is primarily useful for making complicated literal sub-
# stitutions that involve characters that have syntactic meaning to
# ed and hence are difficult to enter in ed.
#
# Each specification begins with a delimiter, followed by a tar-
# get string, followed by the delimiter, followed by the replace-
# ment string, followed by the delimiter. For example
#
# |...|**|
# |****||
#
# specifies the replacement of all occurrences of three consecutive
# periods by two asterisks, followed by the deletion of all
# occurrences of four consecutive asterisks. Any character may be
# used for the delimiter, but the same character must be used in
# all three positions in any specification, and the delimiter char-
# acter cannot be used in the target or replacement strings.
#
# Diagnostic:
#
# Any line that does not have proper delimiter structure is noted
# and does not contribute to the edit script.
#
# Reference:
#
# "A Tutorial Introduction to the UNIX Text Editor", Brian W. Kernighan.
# AT&T Bell Laboratories.
#
############################################################################
procedure main()
local line, image, object, char
while line := read() do {
line ? {
char := move(1) | {error(line); next}
image := tab(find(char)) | {error(line); next}
move(1)
object := tab(find(char)) | {error(line); next}
}
write("g/",xform(image),"/s//",xform(object),"/g")
}
write("w\nq")
end
# process characters that have meaning to ed
#
procedure insert()
static special
initial special := '\\/^&*[.$%'
suspend {
tab(upto(special)) ||
"\\" ||
move(1) ||
(insert() | tab(0))
}
end
procedure error(line)
write(&errout,"*** erroneous input: ",line)
end
# transform line
#
procedure xform(line)
line ?:= insert()
return line
end
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