Re-integrate FEAT_FILTERPIPE code

This feature was accidentally removed when doing the initial import from vim. It
makes vim use pipes instead of temporary files for filtering buffers through
shell commands.

I found that this was missing when looking for references of
SHELL_READ/SHELL_WRITE outside mch_call_shell`.

When `mch_call_shell` is reimplemented on top of libuv process management
facilities, pipes will always be used for communication with child processes so
it makes sense to enable the feature permanently.

.gitignore

@@ -29,6 +29,7 @@
 /src/testdir/*.failed
 /src/testdir/X*
 /src/testdir/valgrind.*
+/src/testdir/.gdbinit
 
 # Folder generated by the unit tests
 /test/includes/post/

src/eval.c

@@ -10252,6 +10252,7 @@ static void f_has(typval_T *argvars, typval_T *rettv)
     "extra_search",
     "farsi",
     "file_in_path",
+    "filterpipe",
     "find_in_path",
     "float",
     "folding",

src/ex_cmds.c

@@ -1024,7 +1024,23 @@ do_filter (
   if (do_out)
     shell_flags |= SHELL_DOOUT;
 
-  if ((do_in && (itmp = vim_tempname('i')) == NULL)
+  if (!do_in && do_out && !p_stmp) {
+    // Use a pipe to fetch stdout of the command, do not use a temp file.
+    shell_flags |= SHELL_READ;
+    curwin->w_cursor.lnum = line2;
+  } else if (do_in && !do_out && !p_stmp) {
+    // Use a pipe to write stdin of the command, do not use a temp file.
+    shell_flags |= SHELL_WRITE;
+    curbuf->b_op_start.lnum = line1;
+    curbuf->b_op_end.lnum = line2;
+  } else if (do_in && do_out && !p_stmp) {
+    // Use a pipe to write stdin and fetch stdout of the command, do not
+    // use a temp file.
+    shell_flags |= SHELL_READ|SHELL_WRITE;
+    curbuf->b_op_start.lnum = line1;
+    curbuf->b_op_end.lnum = line2;
+    curwin->w_cursor.lnum = line2;
+  } else if ((do_in && (itmp = vim_tempname('i')) == NULL)
       || (do_out && (otmp = vim_tempname('o')) == NULL)) {
     EMSG(_(e_notmp));
     goto filterend;

src/os/event.c

@@ -6,8 +6,10 @@
 #include "os/event.h"
 #include "os/input.h"
 
-static uv_timer_t timer_req;
+static uv_timer_t timer;
+static uv_prepare_t timer_prepare;
 static void timer_cb(uv_timer_t *handle, int);
+static void timer_prepare_cb(uv_prepare_t *, int);
 
 void event_init()
 {
@@ -15,7 +17,9 @@ void event_init()
   input_init();
   /* Timer to wake the event loop if a timeout argument is passed to
    * `event_poll` */
-  uv_timer_init(uv_default_loop(), &timer_req);
+  uv_timer_init(uv_default_loop(), &timer);
+  /* This prepare handle that actually starts the timer */
+  uv_prepare_init(uv_default_loop(), &timer_prepare);
 }
 
 /* Wait for some event */
@@ -33,10 +37,12 @@ bool event_poll(int32_t ms)
   timed_out = false;
 
   if (ms > 0) {
-    /* Timeout passed as argument, start the libuv timer to wake us up and 
+    /* Timeout passed as argument to the timer */
-     * set our local flag */
+    timer.data = &timed_out;
-    timer_req.data = &timed_out;
+    /* We only start the timer after the loop is running, for that we
-    uv_timer_start(&timer_req, timer_cb, ms, 0);
+     * use an prepare handle(pass the interval as data to it) */
+    timer_prepare.data = &ms;
+    uv_prepare_start(&timer_prepare, timer_prepare_cb);
   } else if (ms == 0) {
     /* 
      * For ms == 0, we need to do a non-blocking event poll by
@@ -58,10 +64,11 @@ bool event_poll(int32_t ms)
 
   input_stop();
 
-  if (!timed_out && ms > 0) {
+  if (ms > 0) {
     /* Timer event did not trigger, stop the watcher since we no longer
      * care about it */
-    uv_timer_stop(&timer_req);
+    uv_timer_stop(&timer);
+    uv_prepare_stop(&timer_prepare);
   }
 
   return input_ready();
@@ -72,3 +79,8 @@ static void timer_cb(uv_timer_t *handle, int status)
 {
   *((bool *)handle->data) = true;
 }
+
+static void timer_prepare_cb(uv_prepare_t *handle, int status)
+{
+  uv_timer_start(&timer, timer_cb, *(uint32_t *)handle->data, 0);
+}

src/testdir/Makefile

@@ -27,12 +27,8 @@ SCRIPTS := test1.out test2.out test3.out test4.out test5.out test6.out \
 
 SCRIPTS_GUI := test16.out
 
-ifdef VALGRIND_GDB
+ifdef USE_GDB
-VGDB := --vgdb=yes --vgdb-error=0
+GDB = gdb --args
-endif
-
-ifdef VALGRIND_CHECK
-VALGRIND = valgrind --suppressions=../../.valgrind.supp --leak-check=full --error-exitcode=123 --log-file=valgrind.$* $(VGDB)
 endif
 
 ifdef TESTNUM
@@ -45,6 +41,9 @@ nongui:	nolog $(SCRIPTS) report
 
 gui:	nolog $(SCRIPTS) $(SCRIPTS_GUI) report
 
+.gdbinit:
+	echo 'set $$_exitcode = -1\nrun\nif $$_exitcode != -1\n  quit\nend' > .gdbinit
+
 report:
 	@echo
 	@echo 'Test results:'
@@ -57,12 +56,12 @@ $(SCRIPTS) $(SCRIPTS_GUI): $(VIMPROG)
 
 RM_ON_RUN = test.out X* viminfo
 RM_ON_START = tiny.vim small.vim mbyte.vim mzscheme.vim lua.vim test.ok
-RUN_VIM = $(VALGRIND) $(VIMPROG) -u unix.vim -U NONE --noplugin -s dotest.in
+RUN_VIM = $(GDB) $(VIMPROG) -u unix.vim -U NONE --noplugin -s dotest.in
 
 clean:
 	-rm -rf *.out *.failed *.rej *.orig test.log $(RM_ON_RUN) $(RM_ON_START) valgrind.*
 
-test1.out: test1.in
+test1.out: .gdbinit test1.in
 	-rm -rf $*.failed $(RM_ON_RUN) $(RM_ON_START) wrongtermsize
 	$(RUN_VIM) $*.in
 	@/bin/sh -c "if test -e wrongtermsize; \
@@ -76,7 +75,7 @@ test1.out: test1.in
 		echo; exit 1; fi"
 	-rm -rf X* viminfo
 
-.in.out:
+.in.out: .gdbinit
 	-rm -rf $*.failed test.ok $(RM_ON_RUN)
 	cp $*.ok test.ok
 	# Sleep a moment to avoid that the xterm title is messed up.