degesch: more GNU Readline work
I'm not so sure anymore I will be able to achieve my goals with this library. It's really a terrible mess. A consistent and neatly formatted terrible mess.
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degesch.c
221
degesch.c
@ -187,6 +187,11 @@ struct buffer
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enum buffer_type type; ///< Type of the buffer
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char *name; ///< The name of the buffer
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HISTORY_STATE *history; ///< Saved history state
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char *saved_line; ///< Saved line
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int saved_point; ///< Saved position in line
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int saved_mark; ///< Saved mark
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// Buffer contents:
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struct buffer_line *lines; ///< All lines in this buffer
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@ -215,6 +220,8 @@ static void
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buffer_destroy (struct buffer *self)
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{
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free (self->name);
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// Can't really free "history" here
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free (self->saved_line);
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free (self->topic);
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str_map_free (&self->nicks);
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free (self);
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@ -361,6 +368,8 @@ app_context_free (struct app_context *self)
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free (self->readline_prompt);
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}
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static void refresh_prompt (struct app_context *ctx);
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// --- Attributed output -------------------------------------------------------
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static struct
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@ -417,12 +426,14 @@ struct app_readline_state
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{
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char *saved_line;
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int saved_point;
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int saved_mark;
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};
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static void
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app_readline_hide (struct app_readline_state *state)
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{
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state->saved_point = rl_point;
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state->saved_point = rl_mark;
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state->saved_line = rl_copy_text (0, rl_end);
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rl_set_prompt ("");
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rl_replace_line ("", 0);
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@ -435,6 +446,7 @@ app_readline_restore (struct app_readline_state *state, const char *prompt)
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rl_set_prompt (prompt);
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rl_replace_line (state->saved_line, 0);
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rl_point = state->saved_point;
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rl_mark = state->saved_mark;
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rl_redisplay ();
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free (state->saved_line);
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}
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@ -677,6 +689,12 @@ buffer_line_display (struct app_context *ctx, struct buffer_line *line)
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char *object = iconv_xstrdup (ctx->term_from_utf8, line->object, -1, NULL);
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char *reason = iconv_xstrdup (ctx->term_from_utf8, line->reason, -1, NULL);
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// TODO: colorize the output, note that we shouldn't put everything through
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// tputs but only the attribute strings. That might prove a bit
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// challenging. Maybe we could create a helper object to pust text
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// and formatting into. We could have a varargs function to make it a bit
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// more friendly, e.g. push(&x, ATTR_JOIN, "--> ", ATTR_RESET, who, NULL)
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switch (line->type)
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{
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case BUFFER_LINE_PRIVMSG:
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@ -724,12 +742,15 @@ buffer_line_display (struct app_context *ctx, struct buffer_line *line)
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free (object);
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free (reason);
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// TODO: hide readline if needed
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struct app_readline_state state;
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if (ctx->readline_prompt_shown)
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app_readline_hide (&state);
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printf ("%s\n", text.str);
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str_free (&text);
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// TODO: unhide readline if hidden
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if (ctx->readline_prompt_shown)
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app_readline_restore (&state, ctx->readline_prompt);
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}
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static void
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@ -773,7 +794,7 @@ buffer_add (struct app_context *ctx, struct buffer *buffer)
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str_map_set (&ctx->buffers_by_name, buffer->name, buffer);
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LIST_APPEND_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
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// TODO: refresh the prompt?
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// TODO: refresh the prompt? Or caller?
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}
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static void
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@ -781,6 +802,21 @@ buffer_remove (struct app_context *ctx, struct buffer *buffer)
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{
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hard_assert (buffer != ctx->current_buffer);
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if (buffer->history)
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{
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// See buffer_activate() for why we need to do this BS
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rl_free_undo_list ();
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// This is probably the only way we can free the history fully
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HISTORY_STATE *state = history_get_history_state ();
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history_set_history_state (buffer->history);
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rl_clear_history ();
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history_set_history_state (state);
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free (state);
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}
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str_map_set (&ctx->buffers_by_name, buffer->name, NULL);
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LIST_UNLINK_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
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buffer_destroy (buffer);
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@ -792,22 +828,85 @@ buffer_remove (struct app_context *ctx, struct buffer *buffer)
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if (buffer == ctx->server_buffer)
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ctx->server_buffer = NULL;
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// TODO: refresh the prompt?
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// TODO: refresh the prompt? Or caller?
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}
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static void
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buffer_activate (struct app_context *ctx, struct buffer *buffer)
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{
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ctx->current_buffer = buffer;
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if (ctx->current_buffer == buffer)
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return;
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print_status ("%s", buffer->name);
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// That is, minus the buffer switch line and the readline prompt
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int to_display = ctx->lines - 2;
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// TODO: find the to_display-th line from the back
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// TODO: print all the lines in order
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int to_display = MAX (10, ctx->lines - 2);
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struct buffer_line *line = buffer->lines_tail;
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while (line && line->prev && --to_display > 0)
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line = line->prev;
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// TODO: switch readline history stack
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// TODO: refresh the prompt?
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// Once we've found where we want to start with the backlog, print it
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for (; line; line = line->next)
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buffer_line_display (ctx, line);
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// The following part shows you why it's not a good idea to use
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// GNU Readline for this kind of software. Or for anything else, really.
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// There could possibly be occurences of the current undo list in some
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// history entry. We either need to free the undo list, or move it
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// somewhere else to load back later, as the buffer we're switching to
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// has its own history state.
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rl_free_undo_list ();
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// Save this buffer's history so that it's independent for each buffer
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if (ctx->current_buffer)
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{
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ctx->current_buffer->history = history_get_history_state ();
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ctx->current_buffer->saved_line = rl_copy_text (0, rl_end);
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ctx->current_buffer->saved_point = rl_point;
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ctx->current_buffer->saved_mark = rl_mark;
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}
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else
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// Just throw it away; there should always be an active buffer however
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rl_clear_history ();
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// Now at last we can switch the pointers
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ctx->current_buffer = buffer;
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// Restore the target buffer's history
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if (buffer->history)
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{
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// history_get_history_state() just allocates a new HISTORY_STATE
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// and fills it with its current internal data. We don't need that
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// shell anymore after reviving it.
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history_set_history_state (buffer->history);
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free (buffer->history);
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buffer->history = NULL;
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}
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else
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{
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// This should get us a clean history while keeping the flags.
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// Note that we've either saved the previous history entries, or we've
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// cleared them altogether, so there should be nothing to leak.
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HISTORY_STATE *state = history_get_history_state ();
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state->offset = state->length = state->size = 0;
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history_set_history_state (state);
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free (state);
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}
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// Try to restore the target buffer's readline state
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if (buffer->saved_line)
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{
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rl_replace_line (buffer->saved_line, 0);
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rl_point = buffer->saved_point;
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rl_mark = buffer->saved_mark;
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free (buffer->saved_line);
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if (ctx->readline_prompt_shown)
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rl_redisplay ();
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}
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// TODO: refresh the prompt? Or caller?
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}
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static void
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@ -1099,6 +1198,8 @@ irc_establish_connection (struct app_context *ctx,
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return true;
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}
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// --- More readline funky stuff -----------------------------------------------
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static void
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refresh_prompt (struct app_context *ctx)
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{
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@ -1140,8 +1241,67 @@ refresh_prompt (struct app_context *ctx)
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}
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str_free (&prompt);
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// FIXME: when the program hasn't displayed the prompt yet, is this okay?
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rl_redisplay ();
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// We need to be somehow able to initialize it
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rl_set_prompt (ctx->readline_prompt);
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if (ctx->readline_prompt_shown)
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rl_redisplay ();
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}
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static int
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on_readline_goto_buffer (int count, int key)
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{
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(void) count;
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if (!(key & 0x80))
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return 0;
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int n = (key & 0x7F) - '0';
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if (n < 0 || n > 9)
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return 0;
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// TODO: switch to the n-th buffer
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return 0;
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}
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static int
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on_readline_previous_buffer (int count, int key)
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{
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(void) key;
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// TODO: switch "count" times to the previous buffer
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return 0;
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}
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static int
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on_readline_next_buffer (int count, int key)
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{
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(void) key;
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// TODO: switch "count" times to the next buffer
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return 0;
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}
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static int
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init_readline (void)
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{
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// TODO: maybe use rl_make_bare_keymap() and start from there;
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// our dear user could potentionally rig things up in a way that might
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// result in some funny unspecified behaviour
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rl_add_defun ("previous-buffer", on_readline_previous_buffer, -1);
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rl_add_defun ("next-buffer", on_readline_next_buffer, -1);
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// Redefine M-0 through M-9 to switch buffers
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for (int i = 0; i <= 9; i++)
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rl_bind_key (0x80 /* this is the Meta modifier for Readline */
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rl_bind_keyseq ("C-p", rl_named_function ("previous-buffer"));
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rl_bind_keyseq ("C-n", rl_named_function ("next-buffer"));
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rl_bind_keyseq ("M-p", rl_named_function ("previous-history"));
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rl_bind_keyseq ("M-n", rl_named_function ("next-history"));
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return 0;
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}
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// --- Input handling ----------------------------------------------------------
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@ -1268,24 +1428,6 @@ fail:
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free (input);
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}
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static int
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on_readline_previous_buffer (int count, int key)
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{
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(void) key;
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// TODO: switch to the previous buffer
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return 0;
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}
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static int
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on_readline_next_buffer (int count, int key)
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{
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(void) key;
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// TODO: switch to the next buffer
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return 0;
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}
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// --- Supporting code (continued) ---------------------------------------------
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enum irc_read_result
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@ -1898,6 +2040,7 @@ main (int argc, char *argv[])
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atexit (ERR_free_strings);
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using_history ();
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// This can cause memory leaks, or maybe even a segfault. Funny, eh?
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stifle_history (HISTORY_LIMIT);
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setup_signal_handlers ();
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@ -1905,6 +2048,7 @@ main (int argc, char *argv[])
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init_colors (&ctx);
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init_poller_events (&ctx);
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init_buffers (&ctx);
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ctx.current_buffer = ctx.global_buffer;
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refresh_prompt (&ctx);
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// TODO: connect asynchronously (first step towards multiple servers)
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@ -1917,22 +2061,7 @@ main (int argc, char *argv[])
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exit (EXIT_FAILURE);
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}
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// TODO: maybe use rl_make_bare_keymap() and start from there
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// XXX: Since readline() installs a set of default key bindings the first
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// time it is called, there is always the danger that a custom binding
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// installed before the first call to readline() will be overridden.
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// An alternate mechanism is to install custom key bindings in an
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// initialization function assigned to the rl_startup_hook variable.
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rl_add_defun ("previous-buffer", on_readline_previous_buffer, -1);
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rl_add_defun ("next-buffer", on_readline_next_buffer, -1);
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// TODO: redefine M-0 through M-9 to switch buffers
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rl_bind_keyseq ("C-p", rl_named_function ("previous-buffer"));
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rl_bind_keyseq ("C-n", rl_named_function ("next-buffer"));
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rl_bind_keyseq ("M-p", rl_named_function ("previous-history"));
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rl_bind_keyseq ("M-n", rl_named_function ("next-history"));
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rl_startup_hook = init_readline;
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rl_catch_sigwinch = false;
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rl_callback_handler_install (ctx.readline_prompt, on_readline_input);
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rl_get_screen_size (&ctx.lines, &ctx.columns);
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