1 # $Id: cnf-to-paths.awk 23442 2011-08-07 22:50:24Z karl $
2 # cnf-to-paths.awk - convert texmf.cnf assignments to paths.h #define's.
3 # Public domain. Originally written 2011, Karl Berry.
5 # We assume comments have been stripped.
7 # we only care about definitions with a valid C identifier (e.g.,
8 # TEXINPUTS, not TEXINPUTS.latex), that is, lines that look like this:
10 # (whitespace around the = is optional)
12 /^[ \t]*[A-Z0-9_]+[ \t]*=/ {
13 # On these lines, we distinguish three cases:
15 # 1) definitions referring to SELFAUTO*, which we want to keep. In
16 # particular, this is how the compile-time TEXMFCNF gets defined and
17 # thus how texmf.cnf gets found.
19 # 2) definitions starting with a /, which we also want to keep. Here
20 # we assume a distro maintainer has changed a variable, e.g.,
21 # TEXMFMAIN=/usr/share/texmf, so keep it. (This also preserves the
22 # default values for OSFONTDIR and TRFONTS, but that's ok.)
24 # 3) anything else, which we want to convert to a constant /nonesuch.
25 # That way, the binaries don't get changed just because we change
26 # definitions in texmf.cnf.
28 # The definition of DEFAULT_TEXMF (and other variables)
29 # that winds up in the final paths.h will not be used.
31 # Extract the identifier and the value from the line. Since
32 # gawk's subexpression matching is an extension, do it with copies.
34 sub(/^[ \t]*/, "", ident);
35 sub(/[ \t]*=.*/, "", ident);
38 sub(/^.*=[ \t]*/, "", val);
39 sub(/[ \t]*$/, "", val);
40 #print "got ident", ident, "and val", val >"/dev/stderr";
42 if (val ~ /\$SELFAUTO/) {
43 # Replace all semicolons with colons in the SELFAUTO paths we're keeping.
44 # (The path-splitting code should be changed to understand both.)
46 } else if (val ~ /^\//) {
47 # If the value starts with /, presume we're compiling with changes
48 # made for a distro, and keep it. Likewise switch to :.
54 print "#ifndef DEFAULT_" ident;
55 print "#define DEFAULT_" ident " \"" val "\"";