clipmenud: Allow partial_merge_secs to be configurable

Closes #259.

Author: cdown

man/clipmenu.conf.5

@@ -53,6 +53,13 @@ When an entry is selected via
 it will also be moved up to the newest slot.
 Default: 0.
 .TP
+.B partial_merge_secs
+Specifies the time window in seconds during which consecutive clipboard updates
+where the previous entry was a substring of the new one are merged together
+instead of being stored separately. This is useful for applications that
+incrementally update the clipboard (e.g. progressive text selection in
+browsers). Set to 0 to disable partial merging entirely. Default: 2.
+.TP
 .B cm_dir
 Overrides the default directory for the clip store. This is by default at a
 subdirectory inside XDG_RUNTIME_DIR, TMPDIR, or if both are unset, inside /tmp.

src/clipmenud.c

@@ -289,11 +289,6 @@ static void maybe_trim(void) {
     }
 }
 
-/**
- * Clips more than this many seconds apart are not considered for partial merge
- */
-#define PARTIAL_MAX_SECS 2
-
 /**
  * Store the clipboard text. If the text is a possible partial of the last clip
  * and it was received shortly afterwards, replace instead of adding.
@@ -306,8 +301,8 @@ static uint64_t store_clip(struct clip_text *ct) {
     time_t current_time = time(NULL);
     uint64_t hash;
 
-    if (last_text.data &&
-        difftime(current_time, last_text_time) <= PARTIAL_MAX_SECS &&
+    if (cfg.partial_merge_secs > 0 && last_text.data &&
+        difftime(current_time, last_text_time) <= cfg.partial_merge_secs &&
         is_possible_partial(last_text.data, ct->data)) {
         dbg("Possible partial of last clip, replacing\n");
         expect(cs_replace(&cs, CS_ITER_NEWEST_FIRST, 0, ct->data, &hash) == 0);

src/config.c

@@ -289,6 +289,8 @@ int config_setup_internal(FILE *file, struct config *cfg) {
         {"launcher_pass_dmenu_args", "CM_LAUNCHER_PASS_DMENU_ARGS",
          &cfg->launcher_pass_dmenu_args, convert_bool, "1", 0},
         {"touch_on_select", NULL, &cfg->touch_on_select, convert_bool, "0", 0},
+        {"partial_merge_secs", NULL, &cfg->partial_merge_secs,
+         convert_positive_int, "2", 0},
         {"cm_dir", "CM_DIR", &cfg->runtime_dir, convert_cm_dir, NULL, 0}};
 
     size_t entries_len = arrlen(entries);

src/config.h

@@ -52,6 +52,7 @@ struct config {
     struct launcher launcher;
     bool launcher_pass_dmenu_args;
     bool touch_on_select;
+    int partial_merge_secs;
 };
 typedef int (*conversion_func_t)(const char *, void *);
 struct config_entry {