Basic implementation of a line editor
Not yet used anywhere.
This commit is contained in:
parent
f71eee66bd
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GPG Key ID:
B715679E3A361BE6
284
nncmpp.c
284
nncmpp.c
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@ -632,6 +632,13 @@ static struct app_context
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struct poller_idle refresh_event; ///< Refresh the screen
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// Line editor:
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int editor_point; ///< Caret index into line data
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ARRAY (ucs4_t, editor_line) ///< Line data
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void (*on_editor_changed) (void); ///< Callback on text change
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void (*on_editor_end) (bool); ///< Callback on abort
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// Terminal:
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termo_t *tk; ///< termo handle
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@ -846,9 +853,6 @@ app_init_terminal (void)
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if (!initscr () || nonl () == ERR)
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abort ();
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// Disable cursor, we're not going to use it most of the time
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curs_set (0);
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// By default we don't use any colors so they're not required...
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if (start_color () == ERR
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|| use_default_colors () == ERR
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@ -878,6 +882,8 @@ app_free_context (void)
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strv_free (&g.streams);
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item_list_free (&g.playlist);
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free (g.editor_line);
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config_free (&g.config);
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poller_free (&g.poller);
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free (g.message);
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@ -916,7 +922,6 @@ app_is_character_in_locale (ucs4_t ch)
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// --- Rendering ---------------------------------------------------------------
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// TODO: rewrite this so that it's fine-grained but not complicated
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static void
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app_invalidate (void)
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{
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@ -1335,17 +1340,59 @@ app_write_mpd_status (struct row_buffer *buf)
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row_buffer_free (&right);
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}
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static void
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row_buffer_append_c (struct row_buffer *self, ucs4_t c, chtype attrs)
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{
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struct row_char current = { .attrs = attrs, .c = c };
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struct row_char invalid = { .attrs = attrs, .c = '?', .width = 1 };
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current.width = uc_width (current.c, locale_charset ());
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if (current.width < 0 || !app_is_character_in_locale (current.c))
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current = invalid;
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ARRAY_RESERVE (self->chars, 1);
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self->chars[self->chars_len++] = current;
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self->total_width += current.width;
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}
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static int
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app_write_editor (struct row_buffer *row)
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{
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// TODO: there should be a one-character prefix to distinguish operations
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// (also known as the prompt)
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// TODO: some scrolling mechanism
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int offset = 0;
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for (size_t i = 0; i < g.editor_line_len; i++)
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{
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if (g.editor_point > (int) i)
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offset += uc_width (g.editor_line[i], locale_charset ());
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row_buffer_append_c (row, g.editor_line[i], APP_ATTR (HIGHLIGHT));
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}
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return MIN (offset, COLS - 1);
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}
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static void
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app_draw_statusbar (void)
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{
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int caret = -1;
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struct row_buffer buf = row_buffer_make ();
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if (g.message)
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row_buffer_append (&buf, g.message, APP_ATTR (HIGHLIGHT));
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else if (g.editor_line)
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caret = app_write_editor (&buf);
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else if (g.client.state == MPD_CONNECTED)
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app_write_mpd_status (&buf);
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move (LINES - 1, 0);
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app_flush_buffer (&buf, COLS, APP_ATTR (NORMAL));
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curs_set (0);
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if (caret != -1)
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{
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move (LINES - 1, caret);
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curs_set (1);
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}
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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@ -1465,7 +1512,7 @@ app_goto_tab (int tab_index)
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return false;
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}
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// --- User input handling -----------------------------------------------------
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// --- Actions -----------------------------------------------------------------
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#define ACTIONS(XX) \
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XX( NONE, "Do nothing" ) \
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@ -1506,7 +1553,22 @@ app_goto_tab (int tab_index)
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\
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XX( GOTO_VIEW_TOP, "Select the top item" ) \
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XX( GOTO_VIEW_CENTER, "Select the center item" ) \
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XX( GOTO_VIEW_BOTTOM, "Select the bottom item" )
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XX( GOTO_VIEW_BOTTOM, "Select the bottom item" ) \
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\
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XX( EDITOR_B_CHAR, "Go back a character" ) \
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XX( EDITOR_F_CHAR, "Go forward a character" ) \
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XX( EDITOR_B_WORD, "Go back a word" ) \
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XX( EDITOR_F_WORD, "Go forward a word" ) \
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XX( EDITOR_HOME, "Go to start of line" ) \
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XX( EDITOR_END, "Go to end of line" ) \
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\
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XX( EDITOR_B_DELETE, "Delete last character" ) \
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XX( EDITOR_F_DELETE, "Delete next character" ) \
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XX( EDITOR_B_KILL_WORD, "Delete last word" ) \
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XX( EDITOR_B_KILL_LINE, "Delete all up to BOL" ) \
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XX( EDITOR_F_KILL_LINE, "Delete all up to EOL" ) \
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\
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XX( EDITOR_CONFIRM, "Confirm editor input" )
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enum action
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{
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@ -1528,7 +1590,151 @@ g_actions[] =
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#undef XX
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};
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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// --- Line editor -------------------------------------------------------------
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// TODO: move the editor out as a component to liberty-tui.c
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/// Notify whomever invoked the editor that it's been either confirmed or
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/// cancelled and clean up editor state
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static void
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app_editor_abort (bool status)
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{
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g.on_editor_end (status);
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g.on_editor_changed = NULL;
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g.on_editor_end = NULL;
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free (g.editor_line);
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g.editor_line = NULL;
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g.editor_line_alloc = 0;
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g.editor_line_len = 0;
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}
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/// Start the line editor; remember to fill in "change" and "abort" callbacks
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static void
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app_editor_start (void)
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{
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ARRAY_INIT (g.editor_line);
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g.editor_point = 0;
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app_invalidate ();
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}
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static void
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app_editor_changed (void)
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{
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if (g.on_editor_changed)
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g.on_editor_changed ();
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}
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static bool
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app_editor_process_action (enum action action)
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{
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app_invalidate ();
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switch (action)
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{
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case ACTION_QUIT:
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app_editor_abort (false);
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return true;
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case ACTION_EDITOR_CONFIRM:
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app_editor_abort (true);
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return true;
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default:
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return false;
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case ACTION_EDITOR_B_CHAR:
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if (g.editor_point < 1)
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return false;
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g.editor_point--;
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return true;
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case ACTION_EDITOR_F_CHAR:
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if (g.editor_point + 1 > (int) g.editor_line_len)
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return false;
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g.editor_point++;
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return true;
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case ACTION_EDITOR_B_WORD:
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{
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if (g.editor_point < 1)
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return false;
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int i = g.editor_point;
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while (i && g.editor_line[--i] == ' ');
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while (i-- && g.editor_line[i] != ' ');
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g.editor_point = ++i;
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return true;
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}
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case ACTION_EDITOR_F_WORD:
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{
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if (g.editor_point + 1 > (int) g.editor_line_len)
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return false;
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int i = g.editor_point;
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while (i < (int) g.editor_line_len && g.editor_line[i] != ' ') i++;
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while (i < (int) g.editor_line_len && g.editor_line[i] == ' ') i++;
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g.editor_point = i;
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return true;
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}
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case ACTION_EDITOR_HOME:
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g.editor_point = 0;
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return true;
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case ACTION_EDITOR_END:
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g.editor_point = g.editor_line_len;
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return true;
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case ACTION_EDITOR_B_DELETE:
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if (g.editor_point < 1)
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return false;
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memmove (g.editor_line + g.editor_point - 1,
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g.editor_line + g.editor_point,
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sizeof *g.editor_line * (g.editor_line_len-- - g.editor_point));
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g.editor_point--;
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app_editor_changed ();
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return true;
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case ACTION_EDITOR_F_DELETE:
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if (g.editor_point + 1 > (int) g.editor_line_len)
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return false;
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memmove (g.editor_line + g.editor_point,
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g.editor_line + g.editor_point + 1,
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sizeof *g.editor_line * (--g.editor_line_len - g.editor_point));
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app_editor_changed ();
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return true;
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case ACTION_EDITOR_B_KILL_WORD:
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{
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if (g.editor_point < 1)
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return false;
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int i = g.editor_point;
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while (i && g.editor_line[--i] == ' ');
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while (i-- && g.editor_line[i] != ' ');
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i++;
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memmove (g.editor_line + i, g.editor_line + g.editor_point,
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sizeof *g.editor_line * (g.editor_line_len - g.editor_point));
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g.editor_line_len -= g.editor_point - i;
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g.editor_point = i;
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app_editor_changed ();
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return true;
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}
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case ACTION_EDITOR_B_KILL_LINE:
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memmove (g.editor_line, g.editor_line + g.editor_point,
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sizeof *g.editor_line * (g.editor_line_len -= g.editor_point));
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app_editor_changed ();
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return true;
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case ACTION_EDITOR_F_KILL_LINE:
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g.editor_line_len = g.editor_point;
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app_editor_changed ();
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return true;
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}
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}
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static void
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app_editor_insert (ucs4_t codepoint)
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{
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ARRAY_RESERVE (g.editor_line, 1);
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memmove (g.editor_line + g.editor_point + 1, g.editor_line + g.editor_point,
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sizeof *g.editor_line * (g.editor_line_len - g.editor_point));
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g.editor_line[g.editor_point++] = codepoint;
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g.editor_line_len++;
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app_editor_changed ();
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}
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// --- User input handling -----------------------------------------------------
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static void
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mpd_client_vsend_command (struct mpd_client *self, va_list ap)
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@ -1756,6 +1962,9 @@ app_process_mouse (termo_mouse_event_t type, int line, int column, int button,
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if (type != TERMO_MOUSE_PRESS)
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return true;
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if (g.editor_line)
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app_editor_abort (false);
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if (button == 1)
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return app_process_left_mouse_click (line, column, double_click);
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else if (button == 4)
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@ -1820,6 +2029,32 @@ g_default_bindings[] =
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{ "u", ACTION_MPD_UPDATE_DB, {}},
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{ "M-PageUp", ACTION_MPD_VOLUME_UP, {}},
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{ "M-PageDown", ACTION_MPD_VOLUME_DOWN, {}},
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},
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g_editor_bindings[] =
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{
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{ "Left", ACTION_EDITOR_B_CHAR, {}},
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{ "Right", ACTION_EDITOR_F_CHAR, {}},
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{ "C-b", ACTION_EDITOR_B_CHAR, {}},
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{ "C-f", ACTION_EDITOR_F_CHAR, {}},
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{ "M-b", ACTION_EDITOR_B_WORD, {}},
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{ "M-f", ACTION_EDITOR_F_WORD, {}},
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{ "Home", ACTION_EDITOR_HOME, {}},
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{ "End", ACTION_EDITOR_END, {}},
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{ "C-a", ACTION_EDITOR_HOME, {}},
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{ "C-e", ACTION_EDITOR_END, {}},
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{ "C-h", ACTION_EDITOR_B_DELETE, {}},
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{ "DEL", ACTION_EDITOR_B_DELETE, {}},
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{ "Backspace", ACTION_EDITOR_B_DELETE, {}},
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{ "C-d", ACTION_EDITOR_F_DELETE, {}},
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{ "Delete", ACTION_EDITOR_F_DELETE, {}},
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{ "C-u", ACTION_EDITOR_B_KILL_LINE, {}},
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{ "C-k", ACTION_EDITOR_F_KILL_LINE, {}},
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{ "C-w", ACTION_EDITOR_B_KILL_WORD, {}},
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{ "C-g", ACTION_QUIT, {}},
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{ "Escape", ACTION_QUIT, {}},
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{ "Enter", ACTION_EDITOR_CONFIRM, {}},
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};
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static int
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@ -1830,25 +2065,32 @@ app_binding_cmp (const void *a, const void *b)
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}
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static void
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app_init_bindings (void)
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app_init_bindings (struct binding *bindings, size_t len)
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{
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for (size_t i = 0; i < N_ELEMENTS (g_default_bindings); i++)
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{
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struct binding *binding = &g_default_bindings[i];
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for (size_t i = 0; i < len; i++)
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hard_assert (!*termo_strpkey_utf8 (g.tk,
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binding->key, &binding->decoded, TERMO_FORMAT_ALTISMETA));
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}
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qsort (g_default_bindings, N_ELEMENTS (g_default_bindings),
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sizeof *g_default_bindings, app_binding_cmp);
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bindings[i].key, &bindings[i].decoded, TERMO_FORMAT_ALTISMETA));
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qsort (bindings, len, sizeof *bindings, app_binding_cmp);
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}
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static bool
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app_process_termo_event (termo_key_t *event)
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{
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struct binding dummy = { NULL, 0, *event }, *binding =
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bsearch (&dummy, g_default_bindings, N_ELEMENTS (g_default_bindings),
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sizeof *g_default_bindings, app_binding_cmp);
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if (binding)
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struct binding dummy = { NULL, 0, *event }, *binding;
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if (g.editor_line)
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{
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if ((binding = bsearch (&dummy, g_editor_bindings,
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N_ELEMENTS (g_editor_bindings), sizeof *binding, app_binding_cmp)))
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return app_editor_process_action (binding->action);
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if (event->type != TERMO_TYPE_KEY || event->modifiers != 0)
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return false;
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app_editor_insert (event->code.codepoint);
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app_invalidate ();
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return true;
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}
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if ((binding = bsearch (&dummy, g_default_bindings,
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N_ELEMENTS (g_default_bindings), sizeof *binding, app_binding_cmp)))
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return app_process_action (binding->action);
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// TODO: parametrize actions, put this among other bindings
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@ -3298,7 +3540,9 @@ main (int argc, char *argv[])
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app_init_terminal ();
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signals_setup_handlers ();
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app_init_poller_events ();
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app_init_bindings ();
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app_init_bindings (g_default_bindings, N_ELEMENTS (g_default_bindings));
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app_init_bindings (g_editor_bindings, N_ELEMENTS (g_editor_bindings));
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if (g_debug_mode)
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app_prepend_tab (debug_tab_init ());
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