guestfish: Add tilde expansion for paths (RHBZ#511372).

This commit adds tilde expansion for local users in guestfish:

  ><fs> echo "~"
  ~
  ><fs> echo ~
  /home/rjones
  ><fs> echo ~foo
  ~foo
  ><fs> echo ~rjones/bar
  /home/rjones/bar
  ><fs> echo ~roo
  ~roo
  ><fs> echo ~root/foo
  /root/foo
  ><fs> echo ~root
  /root

1 files changed, 13 insertions, 1 deletions

diff --git a/fish/fish.c b/fish/fish.c
index 4042bbcf..f5d538d1 100644
--- a/fish/fish.c
+++ b/fish/fish.c
@@ -514,6 +514,7 @@ script (int prompt)
   char *argv[64];
   int i, len;
   int global_exit_on_error = !prompt;
+  int tilde_candidate;
 
   if (prompt)
     printf (_("\n"
@@ -587,6 +588,8 @@ script (int prompt)
 
     /* Get the parameters. */
     while (*p && i < sizeof argv / sizeof argv[0]) {
+      tilde_candidate = 0;
+
       /* Parameters which start with quotes or pipes are treated
        * specially.  Bare parameters are delimited by whitespace.
        */
@@ -647,6 +650,11 @@ script (int prompt)
 	*(pend-1) = '\0';
 	*/
       } else if (*p != ' ' && *p != '\t') {
+	/* If the first character is a ~ then note that this parameter
+	 * is a candidate for ~username expansion.  NB this does not
+	 * apply to quoted parameters.
+	 */
+	tilde_candidate = *p == '~';
 	len = strcspn (p, " \t");
 	if (p[len]) {
 	  p[len] = '\0';
@@ -659,7 +667,11 @@ script (int prompt)
 	abort ();
       }
 
-      argv[i++] = p;
+      if (!tilde_candidate)
+	argv[i] = p;
+      else
+	argv[i] = try_tilde_expansion (p);
+      i++;
       p = pend;
 
       if (*p)