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Refactored prof_history
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parent
bbc5b8bd66
commit
8afe2dd17a
264
prof_history.c
264
prof_history.c
@ -5,129 +5,84 @@
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#include "prof_history.h"
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struct p_history_session_t {
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GList *items;
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GList *sess_curr;
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GList *sess_new;
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GList *orig_curr;
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};
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struct p_history_t {
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GList *items; // the history
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GList *items_curr; // pointer to the current line in the history
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GList *session; // a copy of the history for edits
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GList *sess_curr; // pointer to the current item in the session
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GList *sess_new; // pointer to a possible new element in the session
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GList *items;
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guint max_size;
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struct p_history_session_t session;
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};
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static void _replace_history_with_session(PHistory history);
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static gboolean _adding_new(PHistory history);
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static void _reset_session(PHistory history);
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static gboolean _has_session(PHistory history);
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static void _remove_first(PHistory history);
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static void _update_current_session_item(PHistory history, char *item);
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static void _add_to_history(PHistory history, char *item);
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static void _remove_last_session_item(PHistory history);
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static void _replace_current_with_original(PHistory history);
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static void _create_session(PHistory history);
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static void _session_previous(PHistory history);
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static void _session_next(PHistory history);
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PHistory p_history_new(unsigned int size)
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{
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PHistory new_history = malloc(sizeof(struct p_history_t));
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new_history->items = NULL;
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new_history->items_curr = NULL;
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new_history->session = NULL;
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new_history->sess_curr = NULL;
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new_history->sess_new = NULL;
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new_history->max_size = size;
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_reset_session(new_history);
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return new_history;
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}
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void p_history_append(PHistory history, char *item)
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{
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// copy input, default to ""
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char *copied = "";
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if (item != NULL) {
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copied = strdup(item);
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}
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// if no history yet, just add the item
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if (history->items == NULL) {
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history->items = g_list_append(history->items, copied);
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_add_to_history(history, copied);
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return;
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}
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// if not editing history (no session started)
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if (history->session == NULL) {
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// lose first element if hit max size
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if (!_has_session(history)) {
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if (g_list_length(history->items) == history->max_size) {
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// remove first element
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GList *first = g_list_first(history->items);
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char *first_item = first->data;
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history->items = g_list_remove(history->items, first_item);
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_remove_first(history);
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}
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// append the new item onto the history
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history->items = g_list_append(history->items, copied);
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_add_to_history(history, copied);
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// if editing history (session exists with possible changes)
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} else {
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// update the current item with the input
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history->sess_curr->data = copied;
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_update_current_session_item(history, copied);
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// if current points to last we're just adding the new item,
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// so replace items with session removing the last element if its ""
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if (_adding_new(history)) {
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// remove last if ""
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if (strcmp(history->sess_curr->data, "") == 0) {
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history->session = g_list_reverse(history->session);
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GList *first = g_list_first(history->session);
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history->session = g_list_remove(history->session, first->data);
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history->session = g_list_reverse(history->session);
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if (strcmp(history->session.sess_curr->data, "") == 0) {
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_remove_last_session_item(history);
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}
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_replace_history_with_session(history);
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// otherwise, adding edited history item
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} else {
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_remove_last_session_item(history);
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// remove the last element, its either "" or some new data
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// we want to discard
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history->session = g_list_reverse(history->session);
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GList *first = g_list_first(history->session);
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history->session = g_list_remove(history->session, first->data);
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history->session = g_list_reverse(history->session);
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char *new = strdup(history->session.sess_curr->data);
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history->session.items = g_list_append(history->session.items, new);
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// copy the data at the current position and append it to the
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// session
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char *new = strdup(history->sess_curr->data);
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history->session = g_list_append(history->session, new);
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// replace the edited version with the data from the original
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// history
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history->sess_curr->data = strdup(history->items_curr->data);
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// rewrite history from the session
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_replace_current_with_original(history);
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_replace_history_with_session(history);
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}
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}
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}
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static gboolean _adding_new(PHistory history)
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{
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return (history->sess_curr == g_list_last(history->session));
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}
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static void _replace_history_with_session(PHistory history)
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{
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g_list_free(history->items);
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history->items = g_list_copy(history->session);
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// remove first if overrun max size
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if (g_list_length(history->items) > history->max_size) {
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GList *first = g_list_first(history->items);
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const char *first_item = (char *) first->data;
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history->items = g_list_remove(history->items, first_item);
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}
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// reset the session
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history->items_curr = NULL;
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history->session = NULL;
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history->sess_curr = NULL;
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history->sess_new = NULL;
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}
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char * p_history_previous(PHistory history, char *item)
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{
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// no history
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@ -135,77 +90,140 @@ char * p_history_previous(PHistory history, char *item)
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return NULL;
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}
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// copy input, default to ""
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char *copied = "";
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if (item != NULL) {
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copied = strdup(item);
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}
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// no session, create one
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if (history->session == NULL) {
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history->session = g_list_copy(history->items);
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history->sess_curr = g_list_last(history->session);
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history->items_curr = g_list_last(history->items);
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if (!_has_session(history)) {
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_create_session(history);
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// add the new item including empty string
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g_list_append(history->session, copied);
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history->sess_new = g_list_last(history->session);
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// add the new item
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g_list_append(history->session.items, copied);
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history->session.sess_new = g_list_last(history->session.items);
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char *result = strdup(history->sess_curr->data);
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char *result = strdup(history->session.sess_curr->data);
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return result;
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// session exists
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} else {
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// update the currently pointed to item with passed data
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history->sess_curr->data = copied;
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// move to previous
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history->sess_curr = g_list_previous(history->sess_curr);
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if (history->items_curr == NULL)
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history->items_curr = g_list_last(history->items);
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else
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history->items_curr = g_list_previous(history->items_curr);
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// set to first if rolled over beginning
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if (history->sess_curr == NULL) {
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history->sess_curr = g_list_first(history->session);
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history->items_curr = g_list_first(history->items);
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}
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_update_current_session_item(history, copied);
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_session_previous(history);
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}
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char *result = strdup(history->sess_curr->data);
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char *result = strdup(history->session.sess_curr->data);
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return result;
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}
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char * p_history_next(PHistory history, char *item)
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{
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// no history, or no session, return NULL
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if ((history->items == NULL) || (history->session == NULL)) {
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if ((history->items == NULL) || (history->session.items == NULL)) {
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return NULL;
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}
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// copy input, default to ""
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char *copied = "";
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if (item != NULL) {
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copied = strdup(item);
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}
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// session exists
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_update_current_session_item(history, copied);
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_session_next(history);
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// update the currently pointed to item with passed data
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history->sess_curr->data = copied;
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// move to next
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history->sess_curr = g_list_next(history->sess_curr);
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history->items_curr = g_list_next(history->items_curr);
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// set to last if rolled over beginning
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if (history->sess_curr == NULL) {
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history->sess_curr = g_list_last(history->session);
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history->items_curr = NULL;
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}
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char *result = strdup(history->sess_curr->data);
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char *result = strdup(history->session.sess_curr->data);
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return result;
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}
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static void _replace_history_with_session(PHistory history)
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{
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g_list_free(history->items);
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history->items = g_list_copy(history->session.items);
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if (g_list_length(history->items) > history->max_size) {
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_remove_first(history);
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}
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_reset_session(history);
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}
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static gboolean _adding_new(PHistory history)
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{
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return (history->session.sess_curr ==
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g_list_last(history->session.items));
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}
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static void _reset_session(PHistory history)
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{
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history->session.items = NULL;
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history->session.sess_curr = NULL;
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history->session.sess_new = NULL;
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history->session.orig_curr = NULL;
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}
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static gboolean _has_session(PHistory history)
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{
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return (history->session.items != NULL);
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}
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static void _remove_first(PHistory history)
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{
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GList *first = g_list_first(history->items);
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char *first_item = first->data;
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history->items = g_list_remove(history->items, first_item);
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}
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static void _update_current_session_item(PHistory history, char *item)
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{
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history->session.sess_curr->data = item;
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}
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static void _add_to_history(PHistory history, char *item)
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{
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history->items = g_list_append(history->items, item);
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}
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static void _remove_last_session_item(PHistory history)
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{
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history->session.items = g_list_reverse(history->session.items);
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GList *first = g_list_first(history->session.items);
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history->session.items =
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g_list_remove(history->session.items, first->data);
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history->session.items = g_list_reverse(history->session.items);
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}
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static void _replace_current_with_original(PHistory history)
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{
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history->session.sess_curr->data = strdup(history->session.orig_curr->data);
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}
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static void _create_session(PHistory history)
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{
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history->session.items = g_list_copy(history->items);
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history->session.sess_curr = g_list_last(history->session.items);
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history->session.orig_curr = g_list_last(history->items);
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}
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static void _session_previous(PHistory history)
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{
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history->session.sess_curr =
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g_list_previous(history->session.sess_curr);
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if (history->session.orig_curr == NULL)
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history->session.orig_curr = g_list_last(history->items);
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else
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history->session.orig_curr =
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g_list_previous(history->session.orig_curr);
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if (history->session.sess_curr == NULL) {
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history->session.sess_curr = g_list_first(history->session.items);
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history->session.orig_curr = g_list_first(history->items);
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}
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}
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static void _session_next(PHistory history)
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{
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history->session.sess_curr = g_list_next(history->session.sess_curr);
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history->session.orig_curr = g_list_next(history->session.orig_curr);
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if (history->session.sess_curr == NULL) {
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history->session.sess_curr = g_list_last(history->session.items);
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history->session.orig_curr = NULL;
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}
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}
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