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| -rw-r--r-- | gpp.1 | 52 |
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@@ -177,6 +177,58 @@ the code will expand to You are logged in as @{USER^}. .fi +.SS Include paths +This example lets the user define a colon-separated +list of paths, in the +.B INCLUDEPATH +environment variable, in which to look for files to +either include directly into the source that is being +preprocessed, using the +.BR include_verbatim () +function, directly into the preprocessor, using the +.BR include () +function, or into the source that is being processed +but after preprocessing it with +.BR gpp , +using the +.BR include_verbatim () +and piping it into +.BR gpp . +.PP +.nf +locate () ( + IFS=: + for d in $INCLUDEPATH; do + if [ -f \(dq$d/$1\(dq ]; then + printf \(aq%s\en\(aq \(dq$d/$1\(dq + exit 0 + fi + done + printf \(aqCannot locate %s\en\(aq \(dq$1\(dq >&2 + exit 1 +) + +includex () { + local method + local file + set -e + method=\(dq$1\(dq + file=\(dq$2\(dq + test -n \(dq$method\(dq + test -n \(dq$file\(dq + shift 2 + $method -- \(dq$(locate \(dq$file\(dq)\(dq \(dq$@\(dq +} + +include () { + locatex . \(dq$@\(dq +} + +include_verbatim () { + locatex cat \(dq$@\(dq +} +.fi + .SH RATIONALE Programmers need more automation when we write software and documentation. An unrestricted preprocessor lets |