dash: Fix multi-line prompts when right prompts are used

editline does not render a multi-line PS1 correctly when RPS1 is also
set. To work around this, return only the last line of the cached prompt
to editline, and print the leading lines separately inside setprompt.

1 files changed, 13 insertions, 2 deletions

diff --git a/src/parser.c b/src/parser.c
index 444fa08..985b51d 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -1601,7 +1601,7 @@ STATIC void
 setprompt(int which)
 {
 	struct stackmark smark;
-	const char *prompt, *rprompt;
+	const char *prompt, *rprompt, *nl;
 	int show;
 
 	needprompt = 0;
@@ -1641,6 +1641,10 @@ setprompt(int which)
 		free(rpromptcache);
 		promptcache = savestr(expandstr(prompt));
 		rpromptcache = savestr(expandstr(rprompt));
+
+		nl = strrchr(promptcache, '\n');
+		if (nl)
+			outmem(promptcache, &nl[1] - promptcache, out2);
 	}
 	popstackmark(&smark);
 }
@@ -1651,7 +1655,14 @@ setprompt(int which)
 const char *
 getprompt(void *unused)
 {
-	return promptcache;
+	const char *nl;
+
+	nl = strrchr(promptcache, '\n');
+
+	if (nl)
+		return &nl[1];
+	else
+		return promptcache;
 }
 
 const char *