hush: add support for ${var/pattern/repl}, conditional on bash compat

function                                             old     new   delta
expand_vars_to_list                                 2386    2833    +447
expand_string_to_string                               69     110     +41
parse_dollar                                         681     721     +40
hush_main                                            963     945     -18
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 528/-18)           Total: 510 bytes

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/shell/hush_test/hush-vars/var_bash4.right b/shell/hush_test/hush-vars/var_bash4.right
new file mode 100644
index 000000000..600e8532f
--- /dev/null
+++ b/shell/hush_test/hush-vars/var_bash4.right
@@ -0,0 +1,23 @@
+Source:        a*b\*c
+Replace str:   _\\_\z_
+Pattern:       single backslash and star: "replace literal star"
+In assignment: a_\_z_b\*c
+Unquoted:      a_\_z_b\*c
+Quoted:        a_\_\z_b\*c
+Pattern:       double backslash and star: "replace backslash and everything after it"
+In assignment: a*b_\_z_
+Unquoted:      a*b_\_z_
+Quoted:        a*b_\_\z_
+
+Source:        a\bc
+Replace str:   _\\_\z_
+Pattern:       single backslash and b: "replace b"
+In assignment: a\_\_z_c
+Unquoted:      a\_\_z_c
+Quoted:        a\_\_\z_c
+Pattern:       double backslash and b: "replace backslash and b"
+In assignment: a_\_z_c
+Unquoted:      a_\_z_c
+Quoted:        a_\_\z_c
+
+Done: 0