vis: introduce vis_pipe_collect utility function

2 files changed, 24 insertions, 0 deletions

diff --git a/vis.c b/vis.c
index 3f04c87..e367291 100644
--- a/vis.c
+++ b/vis.c
@@ -1325,6 +1325,25 @@ int vis_pipe(Vis *vis, Filerange *range, const char *argv[],
 	return status;
 }
 
+static ssize_t read_buffer(void *context, char *data, size_t len) {
+	buffer_append(context, data, len);
+	return len;
+}
+
+int vis_pipe_collect(Vis *vis, Filerange *range, const char *argv[], char **out, char **err) {
+	Buffer bufout, buferr;
+	buffer_init(&bufout);
+	buffer_init(&buferr);
+	int status = vis_pipe(vis, range, argv, &bufout, read_buffer, &buferr, read_buffer);
+	buffer_terminate(&bufout);
+	buffer_terminate(&buferr);
+	if (out)
+		*out = bufout.data;
+	if (err)
+		*err = buferr.data;
+	return status;
+}
+
 bool vis_cmd(Vis *vis, const char *cmdline) {
 	if (!cmdline)
 		return true;
diff --git a/vis.h b/vis.h
index ab7eade..0b819a9 100644
--- a/vis.h
+++ b/vis.h
@@ -422,6 +422,11 @@ int vis_pipe(Vis *vis, Filerange *range, const char *argv[],
 	void *stdout_context, ssize_t (*read_stdout)(void *stdout_context, char *data, size_t len),
 	void *stderr_context, ssize_t (*read_stderr)(void *stderr_context, char *data, size_t len));
 
+/* pipe a range to an external application, return its exit status and store
+ * everything that is written to stdout/stderr in the gitven char pointers
+ * which have to be free(3)-ed by the caller */
+int vis_pipe_collect(Vis *vis, Filerange *range, const char *argv[], char **out, char **err);
+
 /* given the start of a key, returns a pointer to the start of the one immediately
  * following as will be processed by the input system. skips over special keys
  * such as <Enter> as well as pseudo keys registered via vis_action_register. */