added <FN> as a search-and-replace variant of <N>

* This is not in Video TECO, but TECO-11 has a search-and-replace variant of <N>.
  <N> however is a search-over-page-boundary command in TECO-11, which has been repurposed
  as search-over-buffer-boundary in Video TECO and SciTECO.
* <N> and <FN> no longer call the edit hook after *every* invocation, but only
  if the current buffer changes. This is not really relevant with the current
  default hook from fallback.teco_ini, but might be depending on the use case.
* Added testcases both for <N> and <FN>.

3 files changed, 53 insertions, 3 deletions

diff --git a/src/core-commands.c b/src/core-commands.c
index d2abe79..4f3ed94 100644
--- a/src/core-commands.c
+++ b/src/core-commands.c
@@ -1037,6 +1037,8 @@ teco_state_fcommand_input(teco_machine_main_t *ctx, gunichar chr, GError **error
 		          .modifier_at = TRUE, .modifier_colon = 2},
 		['R']  = {&teco_state_replace_default,
 		          .modifier_at = TRUE, .modifier_colon = 2},
+		['N']  = {&teco_state_replace_default_all,
+		          .modifier_at = TRUE, .modifier_colon = 1},
 		['G']  = {&teco_state_changedir,
 		          .modifier_at = TRUE},
 
diff --git a/src/search.c b/src/search.c
index 7fcf10e..b02e178 100644
--- a/src/search.c
+++ b/src/search.c
@@ -1000,9 +1000,12 @@ teco_state_search_all_initial(teco_machine_main_t *ctx, GError **error)
 static teco_state_t *
 teco_state_search_all_done(teco_machine_main_t *ctx, const teco_string_t *str, GError **error)
 {
-	if (ctx->flags.mode <= TECO_MODE_NORMAL &&
-	    (!teco_state_search_done(ctx, str, error) ||
-	     !teco_ed_hook(TECO_ED_HOOK_EDIT, error)))
+	if (ctx->flags.mode > TECO_MODE_NORMAL)
+		return &teco_state_start;
+
+	const teco_buffer_t *curbuf = teco_ring_current;
+	if (!teco_state_search_done(ctx, str, error) ||
+	    (teco_ring_current != curbuf && !teco_ed_hook(TECO_ED_HOOK_EDIT, error)))
 		return NULL;
 
 	return &teco_state_start;
@@ -1354,3 +1357,47 @@ teco_state_replace_default_done(teco_machine_main_t *ctx, const teco_string_t *s
 TECO_DEFINE_STATE_SEARCH(teco_state_replace_default,
 	.expectstring.last = FALSE
 );
+
+static teco_state_t *
+teco_state_replace_default_all_done(teco_machine_main_t *ctx, const teco_string_t *str, GError **error)
+{
+	if (ctx->flags.mode > TECO_MODE_NORMAL)
+		return &teco_state_replace_default_ignore;
+
+	const teco_buffer_t *curbuf = teco_ring_current;
+	teco_state_t *state = teco_state_replace_default_done(ctx, str, error);
+	if (!state || (curbuf != teco_ring_current && !teco_ed_hook(TECO_ED_HOOK_EDIT, error)))
+		return NULL;
+
+	return state;
+}
+
+/*$ FN
+ * [n]FN[pattern]$[string]$ -- Search and replace with default over buffer-boundaries
+ * -FN[pattern]$[string]$
+ * from,toFN[pattern]$[string]$
+ * [n]:FN[pattern]$[string]$ -> Success|Failure
+ * -:FN[pattern]$[string]$ -> Success|Failure
+ * from,to:FN[pattern]$[string]$ -> Success|Failure
+ * [n]::FN[pattern]$[string]$ -> Success|Failure
+ * -::FN[pattern]$[string]$ -> Success|Failure
+ * from,to::FN[pattern]$[string]$ -> Success|Failure
+ *
+ * The \fBFN\fP command is similar to the \fBFR\fP command
+ * but will continue to search for occurrences of <pattern> when the
+ * end or beginning of the current buffer is reached.
+ * It searches for <pattern> just like the search over buffer-boundaries
+ * command (\fBN\fP) and replaces the occurrence with <string>
+ * similar to what \fBFR\fP does.
+ * If <string> is empty the string in the global replacement
+ * register is implied instead.
+ *
+ * \fBFN\fP also differs from \fBFR\fP in the interpretation of two arguments.
+ * Using two arguments the search will be bounded between the
+ * buffer with number <from>, up to the buffer with number
+ * <to>.
+ */
+TECO_DEFINE_STATE_SEARCH(teco_state_replace_default_all,
+	.expectstring.last = FALSE,
+	.initial_cb = (teco_state_initial_cb_t)teco_state_search_all_initial
+);
diff --git a/src/search.h b/src/search.h
index 621fdd1..222ca6c 100644
--- a/src/search.h
+++ b/src/search.h
@@ -28,3 +28,4 @@ TECO_DECLARE_STATE(teco_state_search_kill);
 TECO_DECLARE_STATE(teco_state_search_delete);
 TECO_DECLARE_STATE(teco_state_replace);
 TECO_DECLARE_STATE(teco_state_replace_default);
+TECO_DECLARE_STATE(teco_state_replace_default_all);