interactive.h

   1 /* Copyright (C) 2011 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
   2
   3 /** \file interactive.h Public API for interactive sessions. */
   4
   5 /* Interactive is hard to spell, lets' write i9e. */
   6
   7 /** Structure passed as input to the completers. */
   8 struct i9e_completion_info {
   9         char *buffer; /**< The full line. */
  10         char *word; /**< The word the cursor is in. */
  11         int point; /**< Cursor position. */
  12         char **argv; /**< Vector of words in \a buffer. */
  13         int argc; /**< Number of elements(words) in argv. */
  14         int word_num; /**< The cursor is on this word. */
  15 };
  16
  17 /** Completion information returned by the completers. */
  18 struct i9e_completion_result {
  19         /** NULL-terminated array of possible completions. */
  20         char **matches;
  21         /** Whether standard filename completion should be performed. */
  22         bool filename_completion_desired;
  23         /** Suppress adding a space character after the completed word. */
  24         bool dont_append_space;
  25 };
  26
  27 /**
  28  * Define a completer which does nothing.
  29  *
  30  * \param name Determines the name of the function to be defined.
  31  */
  32 #define I9E_DUMMY_COMPLETER(name) static void name ## _completer( \
  33                 __a_unused struct i9e_completion_info *ciname, \
  34                 struct i9e_completion_result *result) {result->matches = NULL;}
  35
  36 /**
  37  * A completer is simply a function pointer and name of the command for which
  38  * it performs completion.
  39  */
  40 struct i9e_completer {
  41         /** The command for which this completer provides completion. */
  42         const char *name;
  43         /** The completer returns all possible completions via the second parameter. */
  44         void (*completer)(struct i9e_completion_info *, struct i9e_completion_result *);
  45 };
  46
  47 /**
  48  * The i9e configuration settings of the client.
  49  *
  50  * A structure of this type must be allocated and filled in by the client
  51  * before it is passed to the i9e subsystem via \ref i9e_open().
  52  */
  53 struct i9e_client_info {
  54         /** Threshold for i9e_log(). */
  55         int loglevel;
  56         /** Complete input lines are passed to this callback function. */
  57         int (*line_handler)(char *line);
  58         /** In single key mode, this callback is executed instead. */
  59         int (*key_handler)(int key);
  60         /** The array of valid key sequences for libreadline. */
  61         char **bound_keyseqs;
  62         /** File descriptors to use for input/output/log. */
  63         int fds[3];
  64         /** Text of the current prompt. */
  65         char *prompt;
  66         /** Where to store the readline history. */
  67         char *history_file;
  68         /**
  69          * The array of completers, one per command. This is used for
  70          * completing the first word (the command) and for calling the right
  71          * completer if the cursor is not on the first word.
  72          */
  73         struct i9e_completer *completers;
  74         /**
  75          * If non-NULL, this node is attached immediately to the stdout btr
  76          * node of the i9e subsystem.
  77          */
  78         struct btr_node *producer;
  79 };
  80
  81 int i9e_open(struct i9e_client_info *ici, struct sched *s);
  82 void i9e_attach_to_stdout(struct btr_node *producer);
  83 void ie9_print_status_bar(char *buf, unsigned len);
  84 void i9e_close(void);
  85 void i9e_signal_dispatch(int sig_num);
  86 __printf_2_3 void i9e_log(int ll, const char* fmt,...);
  87 int i9e_select(int n, fd_set *readfds, fd_set *writefds,
  88                 struct timeval *timeout_tv);
  89 int i9e_extract_completions(const char *word, char **string_list,
  90                 char ***result);
  91 char **i9e_complete_commands(const char *word, struct i9e_completer *completers);
  92 void i9e_complete_option(char **opts, struct i9e_completion_info *ci,
  93                 struct i9e_completion_result *cr);
  94 int i9e_print_completions(struct i9e_completer *completers);
  95 int i9e_get_error(void);