Add support for copy/paste registers

This adds support for vim-style copy/paste registers which allows
cutting and copying multiple items without having to overwrite the
copy/paste buffer. Registers can be specified using the quote key ('"').
To access a register, type '"x' before a command where "x" is the name
of a register. If you want to copy the currently selected item into
register 1, type '"1c'.

Valid registers are 0-9, a-z, "-" and "_". Note that the latter is the
so-called black hole register, which works similar to the black hole
register in vim.

The register prefix key is currently hardcoded and cannot be configured.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

7 files changed, 63 insertions, 38 deletions

diff --git a/src/calcurse.c b/src/calcurse.c
index 8a5d261..770e967 100644
--- a/src/calcurse.c
+++ b/src/calcurse.c
@@ -64,7 +64,7 @@ int main(int argc, char **argv)
 {
   struct day_items_nb inday;
   int no_data_file = 1;
-  int count;
+  int count, reg;
 
 #if ENABLE_NLS
   setlocale(LC_ALL, "");
@@ -173,7 +173,7 @@ int main(int argc, char **argv)
       wins_reset();
     }
 
-    key = keys_getch(win[STA].p, &count);
+    key = keys_getch(win[STA].p, &count, &reg);
     switch (key) {
     case KEY_GENERIC_REDRAW:
       resize = 1;
@@ -286,7 +286,7 @@ int main(int argc, char **argv)
 
     case KEY_GENERIC_CUT:
       if (wins_slctd() == APP && apoint_hilt() != 0) {
-        interact_day_item_cut(&inday.nb_events, &inday.nb_apoints);
+        interact_day_item_cut(&inday.nb_events, &inday.nb_apoints, reg);
         inday = do_storage(0);
         wins_update(FLAG_CAL | FLAG_APP);
       }
@@ -294,7 +294,7 @@ int main(int argc, char **argv)
 
     case KEY_GENERIC_COPY:
       if (wins_slctd() == APP && apoint_hilt() != 0) {
-        interact_day_item_copy(&inday.nb_events, &inday.nb_apoints);
+        interact_day_item_copy(&inday.nb_events, &inday.nb_apoints, reg);
         inday = do_storage(0);
         wins_update(FLAG_CAL | FLAG_APP);
       }
@@ -302,7 +302,7 @@ int main(int argc, char **argv)
 
     case KEY_GENERIC_PASTE:
       if (wins_slctd() == APP) {
-        interact_day_item_paste(&inday.nb_events, &inday.nb_apoints);
+        interact_day_item_paste(&inday.nb_events, &inday.nb_apoints, reg);
         inday = do_storage(0);
         wins_update(FLAG_CAL | FLAG_APP);
       }
diff --git a/src/calcurse.h b/src/calcurse.h
index 8674321..c9b0307 100644
--- a/src/calcurse.h
+++ b/src/calcurse.h
@@ -160,6 +160,9 @@
 #define KEYS_LABELEN        8   /* length of command description */
 #define KEYS_CMDS_PER_LINE  6   /* max number of commands per line */
 
+/* Register definitions. */
+#define REG_BLACK_HOLE 37
+
 /* Size of the hash table the note garbage collector uses. */
 #define NOTE_GC_HSIZE 1024
 
@@ -722,10 +725,10 @@ void interact_day_item_delete(unsigned *, unsigned *);
 void interact_day_item_edit(void);
 void interact_day_item_pipe(void);
 void interact_day_item_repeat(void);
-void interact_day_item_cut_free();
-void interact_day_item_cut(unsigned *, unsigned *);
-void interact_day_item_copy(unsigned *, unsigned *);
-void interact_day_item_paste(unsigned *, unsigned *);
+void interact_day_item_cut_free(unsigned);
+void interact_day_item_cut(unsigned *, unsigned *, unsigned);
+void interact_day_item_copy(unsigned *, unsigned *, unsigned);
+void interact_day_item_paste(unsigned *, unsigned *, unsigned);
 void interact_todo_add(void);
 void interact_todo_delete(void);
 void interact_todo_edit(void);
@@ -768,7 +771,7 @@ void keys_free(void);
 void keys_dump_defaults(char *);
 const char *keys_get_label(enum key);
 enum key keys_get_action(int);
-enum key keys_getch(WINDOW * win, int *);
+enum key keys_getch(WINDOW * win, int *, int *);
 int keys_assign_binding(int, enum key);
 void keys_remove_binding(int, enum key);
 int keys_str2int(const char *);
diff --git a/src/custom.c b/src/custom.c
index 72c531b..185f65a 100644
--- a/src/custom.c
+++ b/src/custom.c
@@ -226,7 +226,7 @@ void custom_layout_config(void)
   display_layout_config(&conf_win, mark, cursor);
   clear();
 
-  while ((ch = keys_getch(win[STA].p, NULL)) != KEY_GENERIC_QUIT) {
+  while ((ch = keys_getch(win[STA].p, NULL, NULL)) != KEY_GENERIC_QUIT) {
     need_reset = 0;
     switch (ch) {
     case KEY_GENERIC_HELP:
@@ -310,7 +310,7 @@ void custom_sidebar_config(void)
                             bindings_size, NULL);
   wins_doupdate();
 
-  while ((ch = keys_getch(win[STA].p, NULL)) != KEY_GENERIC_QUIT) {
+  while ((ch = keys_getch(win[STA].p, NULL, NULL)) != KEY_GENERIC_QUIT) {
     switch (ch) {
     case KEY_MOVE_UP:
       wins_sbar_winc();
@@ -528,7 +528,7 @@ void custom_color_config(void)
                        theme_changed);
   clear();
 
-  while ((ch = keys_getch(win[STA].p, NULL)) != KEY_GENERIC_QUIT) {
+  while ((ch = keys_getch(win[STA].p, NULL, NULL)) != KEY_GENERIC_QUIT) {
     need_reset = 0;
     theme_changed = 0;
 
@@ -921,7 +921,7 @@ void custom_keys_config(void)
   for (;;) {
     int ch;
 
-    ch = keys_getch(win[STA].p, NULL);
+    ch = keys_getch(win[STA].p, NULL, NULL);
     switch (ch) {
     case KEY_MOVE_UP:
       if (selrow > 0) {
diff --git a/src/help.c b/src/help.c
index 32704d3..9ad548f 100644
--- a/src/help.c
+++ b/src/help.c
@@ -800,7 +800,7 @@ void help_screen(void)
     }
 
     wins_scrollwin_display(&hwin);
-    ch = keys_getch(win[STA].p, NULL);
+    ch = keys_getch(win[STA].p, NULL, NULL);
   }
   wins_scrollwin_delete(&hwin);
   if (need_resize)
diff --git a/src/interaction.c b/src/interaction.c
index abe261d..b619992 100644
--- a/src/interaction.c
+++ b/src/interaction.c
@@ -36,7 +36,7 @@
 
 #include "calcurse.h"
 
-struct day_item day_cut = { 0, 0, { NULL } };
+struct day_item day_cut[37] = { { 0, 0, { NULL } } };
 
 /* Request the user to enter a new time. */
 static int day_edit_time(int time, unsigned *new_hour, unsigned *new_minute)
@@ -870,29 +870,30 @@ void interact_day_item_repeat(void)
 }
 
 /* Free the current cut item, if any. */
-void interact_day_item_cut_free(void)
+void interact_day_item_cut_free(unsigned reg)
 {
-  switch (day_cut.type) {
+  switch (day_cut[reg].type) {
   case 0:
     /* No previous item, don't free anything. */
     break;
   case APPT:
-    apoint_free(day_cut.item.apt);
+    apoint_free(day_cut[reg].item.apt);
     break;
   case EVNT:
-    event_free(day_cut.item.ev);
+    event_free(day_cut[reg].item.ev);
     break;
   case RECUR_APPT:
-    recur_apoint_free(day_cut.item.rapt);
+    recur_apoint_free(day_cut[reg].item.rapt);
     break;
   case RECUR_EVNT:
-    recur_event_free(day_cut.item.rev);
+    recur_event_free(day_cut[reg].item.rev);
     break;
   }
 }
 
 /* Cut an item, so that it can be pasted somewhere else later. */
-void interact_day_item_cut(unsigned *nb_events, unsigned *nb_apoints)
+void interact_day_item_cut(unsigned *nb_events, unsigned *nb_apoints,
+                           unsigned reg)
 {
   const int NBITEMS = *nb_apoints + *nb_events;
   int to_be_removed;
@@ -900,11 +901,11 @@ void interact_day_item_cut(unsigned *nb_events, unsigned *nb_apoints)
   if (NBITEMS == 0)
     return;
 
-  interact_day_item_cut_free();
+  interact_day_item_cut_free(reg);
   struct day_item *p = day_cut_item(calendar_get_slctd_day_sec(),
                                     apoint_hilt());
-  day_cut.type = p->type;
-  day_cut.item = p->item;
+  day_cut[reg].type = p->type;
+  day_cut[reg].item = p->item;
 
   calendar_monthly_view_cache_set_invalid();
 
@@ -927,27 +928,29 @@ void interact_day_item_cut(unsigned *nb_events, unsigned *nb_apoints)
 }
 
 /* Copy an item, so that it can be pasted somewhere else later. */
-void interact_day_item_copy(unsigned *nb_events, unsigned *nb_apoints)
+void interact_day_item_copy(unsigned *nb_events, unsigned *nb_apoints,
+                            unsigned reg)
 {
   const int NBITEMS = *nb_apoints + *nb_events;
 
-  if (NBITEMS == 0)
+  if (NBITEMS == 0 || reg == REG_BLACK_HOLE)
     return;
 
-  interact_day_item_cut_free();
-  day_item_fork(day_get_item(apoint_hilt()), &day_cut);
+  interact_day_item_cut_free(reg);
+  day_item_fork(day_get_item(apoint_hilt()), &day_cut[reg]);
 }
 
 /* Paste a previously cut item. */
-void interact_day_item_paste(unsigned *nb_events, unsigned *nb_apoints)
+void interact_day_item_paste(unsigned *nb_events, unsigned *nb_apoints,
+                             unsigned reg)
 {
   int item_type;
   struct day_item day;
 
-  if (!day_cut.type)
+  if (reg == REG_BLACK_HOLE || !day_cut[reg].type)
     return;
 
-  day_item_fork(&day_cut, &day);
+  day_item_fork(&day_cut[reg], &day);
   item_type = day_paste_item(&day, calendar_get_slctd_day_sec());
 
   calendar_monthly_view_cache_set_invalid();
diff --git a/src/keys.c b/src/keys.c
index 579ddc8..38b6780 100644
--- a/src/keys.c
+++ b/src/keys.c
@@ -180,12 +180,13 @@ enum key keys_get_action(int pressed)
     return actions[pressed];
 }
 
-enum key keys_getch(WINDOW * win, int *count)
+enum key keys_getch(WINDOW * win, int *count, int *reg)
 {
   int ch = '0';
 
-  if (count) {
+  if (count && reg) {
     *count = 0;
+    *reg = 0;
     do {
       *count = *count * 10 + ch - '0';
       ch = wgetch(win);
@@ -194,8 +195,23 @@ enum key keys_getch(WINDOW * win, int *count)
 
     if (*count == 0)
       *count = 1;
-  } else
+
+    if (ch == '"') {
+      ch = wgetch(win);
+      if (ch >= '1' && ch <= '9') {
+        *reg = ch - '1' + 1;
+      }
+      else if (ch >= 'a' && ch <= 'z') {
+        *reg = ch - 'a' + 10;
+      }
+      else if (ch == '_') {
+        *reg = REG_BLACK_HOLE;
+      }
+      ch = wgetch(win);
+    }
+  } else {
     ch = wgetch(win);
+  }
 
   switch (ch) {
   case KEY_RESIZE:
@@ -524,7 +540,7 @@ void keys_popup_info(enum key key)
 #define WINCOL (col - 4)
   infowin = popup(WINROW, WINCOL, (row - WINROW) / 2, (col - WINCOL) / 2,
                   keydef[key].label, info[key], 1);
-  keys_getch(infowin, NULL);
+  keys_getch(infowin, NULL, NULL);
   delwin(infowin);
 #undef WINROW
 #undef WINCOL
diff --git a/src/utils.c b/src/utils.c
index 1823321..3e86f17 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -97,12 +97,15 @@ void exit_calcurse(int status)
 
 void free_user_data(void)
 {
+  unsigned i;
+
   day_free_list();
   event_llist_free();
   apoint_llist_free();
   recur_apoint_llist_free();
   recur_event_llist_free();
-  interact_day_item_cut_free();
+  for (i = 0; i <= 37; i++)
+    interact_day_item_cut_free(i);
   todo_free_list();
   notify_free_app();
 }