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| -rw-r--r-- | libterminput_read.3 | 436 |
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diff --git a/libterminput_read.3 b/libterminput_read.3 new file mode 100644 index 0000000..d799a1a --- /dev/null +++ b/libterminput_read.3 @@ -0,0 +1,436 @@ +.TH LIBTERMINPUT_READ 3 LIBTERMINPUT +.SH NAME +libterminput_read \- Read input from the terminal + +.SH SYNOPSIS +.nf +#include <libterminput.h> + +enum libterminput_mod { + LIBTERMINPUT_SHIFT = 0x01, + LIBTERMINPUT_META = 0x02, + LIBTERMINPUT_CTRL = 0x04 +}; + +enum libterminput_key { + LIBTERMINPUT_SYMBOL, + LIBTERMINPUT_UP, + LIBTERMINPUT_DOWN, + LIBTERMINPUT_RIGHT, + LIBTERMINPUT_LEFT, + LIBTERMINPUT_BEGIN, /* keypad 5 without numlock */ + LIBTERMINPUT_TAB, + LIBTERMINPUT_BACKTAB, + LIBTERMINPUT_F1, + LIBTERMINPUT_F2, + LIBTERMINPUT_F3, + LIBTERMINPUT_F4, + LIBTERMINPUT_F5, + LIBTERMINPUT_F6, + LIBTERMINPUT_F7, + LIBTERMINPUT_F8, + LIBTERMINPUT_F9, + LIBTERMINPUT_F10, + LIBTERMINPUT_F11, + LIBTERMINPUT_F12, + LIBTERMINPUT_HOME, /* = find */ + LIBTERMINPUT_INS, + LIBTERMINPUT_DEL, /* = remove */ + LIBTERMINPUT_END, /* = select */ + LIBTERMINPUT_PRIOR, /* page up */ + LIBTERMINPUT_NEXT, /* page down */ + LIBTERMINPUT_ERASE, /* backspace */ + LIBTERMINPUT_ENTER, /* return */ + LIBTERMINPUT_ESC, + LIBTERMINPUT_MACRO, + LIBTERMINPUT_PAUSE, + LIBTERMINPUT_KEYPAD_0, + LIBTERMINPUT_KEYPAD_1, + LIBTERMINPUT_KEYPAD_2, + LIBTERMINPUT_KEYPAD_3, + LIBTERMINPUT_KEYPAD_4, + LIBTERMINPUT_KEYPAD_5, + LIBTERMINPUT_KEYPAD_6, + LIBTERMINPUT_KEYPAD_7, + LIBTERMINPUT_KEYPAD_8, + LIBTERMINPUT_KEYPAD_9, + LIBTERMINPUT_KEYPAD_PLUS, + LIBTERMINPUT_KEYPAD_MINUS, + LIBTERMINPUT_KEYPAD_TIMES, + LIBTERMINPUT_KEYPAD_DIVISION, + LIBTERMINPUT_KEYPAD_DECIMAL, + LIBTERMINPUT_KEYPAD_COMMA, + LIBTERMINPUT_KEYPAD_POINT, + LIBTERMINPUT_KEYPAD_ENTER, +}; + +enum libterminput_button { + LIBTERMINPUT_NO_BUTTON, + LIBTERMINPUT_BUTTON1, + LIBTERMINPUT_BUTTON2, + LIBTERMINPUT_BUTTON3, + LIBTERMINPUT_SCROLL_UP, + LIBTERMINPUT_SCROLL_DOWN, + LIBTERMINPUT_SCROLL_LEFT, + LIBTERMINPUT_SCROLL_RIGHT, + LIBTERMINPUT_XBUTTON1, + LIBTERMINPUT_XBUTTON2, + LIBTERMINPUT_XBUTTON3, + LIBTERMINPUT_XBUTTON4 +}; + +enum libterminput_type { + LIBTERMINPUT_NONE, + LIBTERMINPUT_KEYPRESS, + LIBTERMINPUT_BRACKETED_PASTE_START, + LIBTERMINPUT_BRACKETED_PASTE_END, + LIBTERMINPUT_TEXT, + LIBTERMINPUT_MOUSEEVENT +}; + +enum libterminput_event { + LIBTERMINPUT_PRESS, + LIBTERMINPUT_RELEASE, + LIBTERMINPUT_MOTION, + LIBTERMINPUT_HIGHLIGHT_INSIDE, + LIBTERMINPUT_HIGHLIGHT_OUTSIDE +}; + +struct libterminput_keypress { + enum libterminput_type type; + enum libterminput_key key; + unsigned long long int times; + enum libterminput_mod mods; + char symbol[7]; +}; + +struct libterminput_mouseevent { + enum libterminput_type type; + enum libterminput_mod mods; + enum libterminput_button button; + enum libterminput_event event; + size_t x; + size_t y; + size_t start_x; + size_t start_y; + size_t end_x; + size_t end_y; +}; + +struct libterminput_text { + enum libterminput_type type; + size_t nbytes; + char bytes[512]; +}; + +union libterminput_input { + enum libterminput_type type; + struct libterminput_keypress keypress; + struct libterminput_text text; + struct libterminput_mouseevent mouseevent; +}; + +int libterminput_read(int \fIfd\fP, union libterminput_input *\fIinput\fP, struct libterminput_state *\fIctx\fP); +.fi +.PP +Link with +.IR \-lterminput . + +.SH DESCRIPTION +The +.BR libterminput_read () +reads input from the file descriptor specified in the +.I fd +parameter, parses it as input from the terminal, and +returns the result in the +.IR *input . +.PP +.I ctx +must have been zero-initialised, e.g. with +.BR memset (3) +function. +.PP +.I input +shall be the same pointer every time the +.BR libterminput_read () +function is called with the same +.I ctx , +as should +.IR fd , +except the user may choose to use a negative +file descriptor (expect +.I EBADF +exception) to read the last data that has +been buffered. +.PP +If the +.BR libterminput_read () +function returns 1, there was input; +.I input->type +is used to detech which type of input was parsed. +Currently possible values are: +.TP +.B LIBTERMINPUT_NONE +A special value to mark that the input was either +discard or not yet completed. The function only +reads at most once so input may be complete (input +can also be bufferd, in which case it will not +read at all). +.TP +.B LIBTERMINPUT_KEYPRESS +Normal key press. The pressed key will be stored in +.I input->key +and has a value from +.IR "enum libterminput_key" ; +these values are listed above and have fairly self +explanatory names; however there are three special +values to take note of: +.RS 7 +.TP +.B LIBTERMINPUT_SYMBOL +The key press generated text (or a paste was made +without bracketed paste enabled), which is stored +in +.I input->keypress.symbol +as a NUL-terminated string. For key presses (and +pastes) that generate multiple character-text, one +event will be generated per character. +.TP +.B LIBTERMINPUT_TAB +.TQ +.B LIBTERMINPUT_BACKTAB +Backtab will be reported as shift+tab unless the +.B LIBTERMINPUT_SEPARATE_BACKTAB +flag has been set with the +.BR libterminput_set_flags (3) +function. +.PP +The modifiers are stored, as a bitwise OR of +modifiers, in +.IR input->keypress.mods . +Recognised modifiers are +.BR LIBTERMINPUT_SHIFT , +.BR LIBTERMINPUT_META , +and +.BR LIBTERMINPUT_CTRL , +however, if the terminal support other modifiers, +they may also appear in +.IR input->keypress.mods . +.B NB! +.IR input->keypress.mods +may be non-zero even if +.I input->key +is +.BR LIBTERMINPUT_SYMBOL . +This can happen for example if meta or control was +held down. It is even possible that +.B LIBTERMINPUT_SHIFT +is set, however this is unlikely, and exceptionally +unlikely for any other symbol than the space character. +Information about shift if normally not sent for +normal text keys as shift is used to select which +character on the key generate. + +Some events, namely scrolling with the mouse, may +generate an event which as marked as repeated. This +information is stored in +.I input->keypress.times +and may be ignored and is usually 1, But the application +may choose to inspect this value, in doing so, it shall +ignore the next +.I input->keypress.times-1 +events. +.RE +.TP +.B LIBTERMINPUT_BRACKETED_PASTE_START +Marks the beginning of a bracketed paste. +The application does not need to do anything, +but may choose to defer processing of the +pasted text until the end has been reached. +.TP +.B LIBTERMINPUT_BRACKETED_PASTE_END +Marks the beginning of a bracketed paste. +.TP +.B LIBTERMINPUT_TEXT +The input is text that has been pasted. +The paste may be incomplete. +.B LIBTERMINPUT_BRACKETED_PASTE_END +marks the end of the paste; however even so, a +terminal may choose to break up a paste in order +to deal with pasted escape characters, in particalur +where it looks like the escape esquence that is +used to mark the end of a bracketed paste. The +application shall treat pasted escape characters +as any other character. + +The pasted text will be stored in +.IR input->text.bytes . +Be aware that this is not a NUL-terminated string, +rather, it's length is stored in +.IR input->text.nbytes . +.TP +.B LIBTERMINPUT_MOUSEEVENT +Mouse tracking input. The location of the mouse +is stored in +.I input->mouseevent.x +and +.I input->mouseevent.y +(normally this would indicate the character cell +and the cell in top left corner would have the +value 1 for both fields). + +The button that has been pressed or released is +stored in +.I input->mouseevent.button +and the for a mouse motion event one of the held +done buttons (it is arbitrary which) will be stored +in this field, if any. Possible values are: +.RS 7 +.TP +.B LIBTERMINPUT_NO_BUTTON +This will be used for a mouse motion event where +the mouse button is held down. +.TP +.B LIBTERMINPUT_BUTTON1 +The left mouse button for a right-handed setup or +the right mouse button for a left-handed setup; +that is, it is the primary mouse button. +.TP +.B LIBTERMINPUT_BUTTON2 +The middle mouse button, which is usually a scroll wheel. +.TP +.B LIBTERMINPUT_BUTTON3 +The right mouse button for a right-handed setup or +the left mouse button for a left-handed setup; +that is, it is the secondary mouse button. +.TP +.B LIBTERMINPUT_SCROLL_UP +The user scrolled up with the mouse; this is reported +as a mouse press event even if it is actually a scroll +event. The terminal shall not send a corresponding +release event. +.TP +.B LIBTERMINPUT_SCROLL_DOWN +The user scrolled down with the mouse; this is reported +as a mouse press event even if it is actually a scroll +event. The terminal shall not send a corresponding +release event. +.TP +.B LIBTERMINPUT_SCROLL_LEFT +The user scrolled leftwards with the mouse. The developer +is not aware of any standisation of whether this shall +behandled by the terminal in the same manner as a scroll +up/down even, or as a normal mouse button press/release event; +however for trackpads would be unable to detect a release +event, so it will probably be handled as a scroll event. +.TP +.B LIBTERMINPUT_SCROLL_RIGHT +The user scrolled rightwards with the mouse. The developer +is not aware of any standisation of whether this shall +behandled by the terminal in the same manner as a scroll +up/down even, or as a normal mouse button press/release event; +however for trackpads would be unable to detect a release +event, so it will probably be handled as a scroll event. +.TP +.B LIBTERMINPUT_XBUTTON1 +The first extended button (X1), usually used to go backwards. +.TP +.B LIBTERMINPUT_XBUTTON2 +The second extended button (X2), usually used to go forwards. +.TP +.B LIBTERMINPUT_XBUTTON3 +The third extended button (X3). You probably don't have this one. +.TP +.B LIBTERMINPUT_XBUTTON4 +The fourth extended button (X4). You probably don't have this one. +.RE + +The held down modifiers will be stored a bitwise +OR of modifiers in +.IR input->mouseevent.mods . +The modifiers than currently can appear are +.BR LIBTERMINPUT_SHIFT , +.BR LIBTERMINPUT_META , +and +.BR LIBTERMINPUT_CTRL . + +What type of mouse action has occurred is stored in +.IR input->mouseevent.event ; +possible values are: +.RS 7 +.TP +.B LIBTERMINPUT_PRESS +A mouse button was pressed. +.TP +.B LIBTERMINPUT_RELEASE +A mouse button was released. +.TP +.B LIBTERMINPUT_MOTION +The mouse moved. +.TP +.B LIBTERMINPUT_HIGHLIGHT_INSIDE +Highlight ended inside of selected region. +.I input->mouseevent.mods +and +.I input->mouseevent.button +will be set to 0 and 1, but should be ignored +as this information will not be sent by the terminal. +.TP +.B LIBTERMINPUT_HIGHLIGHT_OUTSIDE +Highlight ended outside of selected region. +.I input->mouseevent.mods +and +.I input->mouseevent.button +will be set to 0 and 1, but should be ignored +as this information will not be sent by the terminal. + +For this event, +.IR input->mouseevent.start_x , +.IR input->mouseevent.start_y , +.IR input->mouseevent.end_x , +and +.IR input->mouseevent.end_y +will also be set to indicate the region selected by +the application. +.RE +.SH RETURN VALUE +The +.BR libterminput_read () +function returns 0 or 1 upon successful completion, +1 if there was input, 0 if the input closed (or an +empty packet was sent, such as on control+d); +otherwise the +.BR libterminput_read () +function returns +.B -1 +and set +.I errno +it indicate the error. + +.SH ERRORS +The +.BR libterminput_read () +function may fail for any reason specified for the +.BR read (3) +function. + +.SH EXAMPLES +None. + +.SH APPLICATION USAGE +None. + +.SH RATIONALE +None. + +.SH FUTURE DIRECTIONS +None. + +.SH NOTES +None. + +.SH BUGS +None. + +.SH SEE ALSO +.BR libterminput_set_flags (3) |