readline: Custom Functions
2.2 Custom Functions
====================
Readline provides many functions for manipulating the text of the line,
but it isn't possible to anticipate the needs of all programs. This
section describes the various functions and variables defined within the
Readline library which allow a user program to add customized
functionality to Readline.
Before declaring any functions that customize Readline's behavior, or
using any functionality Readline provides in other code, an application
writer should include the file '<readline/readline.h>' in any file that
uses Readline's features. Since some of the definitions in 'readline.h'
use the 'stdio' library, the file '<stdio.h>' should be included before
'readline.h'.
'readline.h' defines a C preprocessor variable that should be treated
as an integer, 'RL_READLINE_VERSION', which may be used to conditionally
compile application code depending on the installed Readline version.
The value is a hexadecimal encoding of the major and minor version
numbers of the library, of the form 0xMMMM. MM is the two-digit major
version number; MM is the two-digit minor version number. For Readline
4.2, for example, the value of 'RL_READLINE_VERSION' would be '0x0402'.
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readline: Readline Variables