NAME

eddie - run haskell filters from the command line

SYNOPSYS

eddie [ options ] [ expr ] file ...

DESCRIPTION

eddie evalutes the provided expression on either the contents of the file arguments concatenated together, or standard input if no *file arguments are present.

The --line, --file and --list options can be used to cause expression to be used to process each line, each file, or a list of files or lines respectively.

The prelude, Data.List and Data.Char modules are available for building expressions. Other modules may be added with the --Modules and --modules options.

OPTIONS

--expr

The --expr expr (short form -e expr ) option concatenates it's value to the haskell expression being evaluated with a newline separator. Multiple occurrences can be used to build up a multi-line expression.

If no -e expr option is present, the first non-flag argument will be used for the haskell expression.

--line

The --line (short form -l) option causes eddie to process input line at a time. The expr will be run on each line and the results concatenated together (using unlines).

The command

eddie -l *expr file* ...

is equivalent to the command

eddie "unlines . map *expr*  . lines" *file* ...

--file

The --file (short form -f) causes each file to be processed individually.

Note that the -l and -f options cannot be used together.

--list

The --list (short form -L) option causes eddie to pass the expression a list of lines or files. This requires one of the -l or -f options be used.

The command

eddie -lL *expr file* ...

is equivalent to the command

eddie "unlines . *expr* . lines" filei ...

--binary

The --binary (short form -b) option switches the output mode to binary. It also disables the maybe newline processing. Normally eddie will output a final newline if the last character of the input is not a newline to place the prompt properly. If the -b option is used, the final newline will not be output.

--modules

The --modules name (short form -m name) option is used to import module name into haskell before evaluating the expression.

--Modules

The --Modules name,as (short form -M name,as) option imports the name module using a qualified import with an as clause, with as being the value for the as clause.

DIAGNOSTICS

If the command runs with no problems, eddie will exit with a status of 0. If there are problems with the options, such that the expression is never evaluated, then eddie will exit with a status of 1. If haskell returns an error - probably a compilation problem - then eddie will exit with the status of 2.

SEE ALSO

The wiki at https://chiselapp.com/user/mwm/repository/eddie/wcontent for examples.

BUGS

See the issues list at https://chiselapp.com/user/mwm/repository/eddie/rptview?rn=1.

AUTHOR

Mike Meyer