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@@ -1,11 +1,12 @@ NAME gpp - Bash-based preprocessor for anything - gpp: General Preprocessor - SYNOPSIS gpp [OPTION]... +ETYMOLOGY + gpp stands for General Preprocessor. + DESCRIPTION gpp lets a developer embed directives written in GNU Bash into any text document. These directives are used @@ -36,8 +37,8 @@ DESCRIPTION uppercase you can write @{VARIABLE^^}, or @{VARIABLE,,} for lowercase. - Everything that is not preprocessing directives is - threaded as echo(1):ed lines. + Everything that is not a preprocessing directive is + echo verbatim. OPTIONS -s, --symbol SYMBOL @@ -81,6 +82,48 @@ OPTIONS Short options must be joined. The value of a flag must be in a separate argument from the flag itself. +EXAMPLES + Conditional hello world + This example only includes the "Hello world" line if + the environment variable HELLO is defined and is not + empty. + + @>if [ -z "$HELLO" ]; the + Hello world + @>fi + + Mutliline preprocessor directive + This example creates the function uppercase() that + convert lower case ASCII leters to uper case. + + @<uppercase () { + lower=qwertyuiopasdfghjklzxcvbnm + upper=QWERTYUIOPASDFGHJKLZXCVBNM + sed y/$lower/$upper/ <<<"$*" + @>} + + Inline directives + This example uses the uppercase() function above to + convert the user's username to upper case. If the user's + username is john, the code will expand to You are logged + in as JOHN. + + You are logged in as @(uppercase $USER). + + Variable expansions + In this example, if the user's username john, the code + will expand to You are logged in as john. + + You are logged in as @{USER}. + + Variable expansion with substitution + This example uses a substitution mechanism in Bash to + convert the first letter in a variable to upper case. + In this example, if the user's username john, the code + will expand to You are logged in as John. + + You are logged in as @{USER^}. + RATIONALE Programmers need more automation when we write software and documentation. An unrestricted preprocessor lets @@ -96,6 +139,3 @@ RATIONALE SEE ALSO bash(1), jpp(1), cpp(1), env(1) - - Full documentation available locally via: info '(gpp)' - |