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| -rw-r--r-- | ship/README.markdown | 22 |
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diff --git a/ship/README.markdown b/ship/README.markdown index 01a63bd6..9686d099 100644 --- a/ship/README.markdown +++ b/ship/README.markdown @@ -30,3 +30,25 @@ Undo `make install` with make distclean + +## Macro Development + + To define a new macro, you have to add a function like + + ## usage: BRE -> FUNCTION_NAME \1 [\2 ...] + + where `BRE` is a basic regular expression, that has to match a whole + line. `FUNCTION_NAME` should be the name of a function that outputs + a `sed` script. `\1` refers to the line number, where the macro is + used and `\2 ...` are the backreferences into `BRE`. E.g. + + ## usage: #@date \([.*]\) -> build_datemacro \1 \2 + build_datemacro() { + printf '%da\\\n%s\n' "$1" "$(date +"$2")" + } + + Like in this example, the line number `\1`, which gets mapped to `$1`, + is usually used to only change the line, where the macro got called. + The second argument gets passed as format specifier to `date`. + + Further examples can be found in `./build`. |