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# $Id$
# cnf-to-paths.awk - convert texmf.cnf assignments to paths.h #define's.
# Public domain. Originally written 2011, Karl Berry.
# We assume comments have been stripped.
#
# we only care about definitions with a valid C identifier (e.g.,
# TEXINPUTS, not TEXINPUTS.latex), that is, lines that look like this:
# <name> = <value>
# (whitespace around the = is optional)
#
/^[ \t]*[A-Z0-9_]+[ \t]*=/ {
# On these lines, we distinguish three cases:
#
# 1) definitions referring to SELFAUTO*, which we want to keep. In
# particular, this is how the compile-time TEXMFCNF gets defined and
# thus how texmf.cnf gets found. In fact, TEXMFCNF is the only
# relevant compile-time value at all, and since its value is not used
# from texmf.cnf, we could simplify this whole process in both
# directions. Maybe someday.
#
# 2) definitions starting with a /, which we also want to keep. Here
# we assume a distro maintainer has changed a variable, e.g.,
# TEXMFMAIN=/usr/share/texmf, so keep it. (This also preserves the
# default values for OSFONTDIR and TRFONTS, but that's ok.)
#
# 3) anything else, which we want to convert to a constant /nonesuch.
# That way, the binaries don't get changed just because we change
# definitions in texmf.cnf.
#
# The definition of DEFAULT_TEXMFROOT (and other variables)
# that winds up in the final paths.h will not be used.
# Extract the identifier and the value from the line. Since
# gawk's subexpression matching is an extension, do it with copies.
ident = $0;
sub(/^[ \t]*/, "", ident);
sub(/[ \t]*=.*/, "", ident);
val = $0;
sub(/^.*=[ \t]*/, "", val);
sub(/[ \t]*$/, "", val);
#print "got ident", ident, "and val", val >"/dev/stderr";
if (val ~ /\$SELFAUTO/) {
# Replace all semicolons with colons in the SELFAUTO paths we're keeping.
# (The path-splitting code should be changed to understand both.)
gsub(/;/, ":", val);
} else if (val ~ /^\//) {
# If the value starts with /, presume we're compiling with changes
# made for a distro, and keep it. Likewise switch to :.
gsub(/;/, ":", val);
} else {
val = "/nonesuch";
}
print "#ifndef DEFAULT_" ident;
print "#define DEFAULT_" ident " \"" val "\"";
print "#endif";
print "";
}
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