ash,hush: tab completion of functions and aliases

Since commit 9e2a5668f (ash,hush: allow builtins to be tab-completed,
closes 7532) ash and hush have supported tab completion of builtins.

Other shells, bash and ksh for example, also support tab completion
of functions and aliases.

Add such support to ash and hush.

function                                             old     new   delta
ash_command_name                                       -      92     +92
hush_command_name                                      -      63     +63
ash_builtin_name                                      17       -     -17
hush_builtin_name                                     38       -     -38
------------------------------------------------------------------------------
(add/remove: 2/2 grow/shrink: 0/0 up/down: 169/-55)           Total: 100 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Avi Halachmi <avihpit@yahoo.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 28 insertions, 4 deletions

diff --git a/shell/ash.c b/shell/ash.c
index d4ee4c93e..d2c5c5d50 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -9732,7 +9732,7 @@ evalpipe(union node *n, int flags)
 
 /* setinteractive needs this forward reference */
 #if ENABLE_FEATURE_TAB_COMPLETION
-static const char *get_builtin_name(int i) FAST_FUNC;
+static const char *ash_command_name(int i) FAST_FUNC;
 #endif
 
 /*
@@ -9769,7 +9769,7 @@ setinteractive(int on)
                 if (!line_input_state) {
                         line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
 # if ENABLE_FEATURE_TAB_COMPLETION
-                        line_input_state->get_exe_name = get_builtin_name;
+                        line_input_state->get_exe_name = ash_command_name;
 # endif
 # if EDITING_HAS_sh_get_var
                         line_input_state->sh_get_var = lookupvar;
@@ -10284,9 +10284,33 @@ find_builtin(const char *name)
 
 #if ENABLE_FEATURE_TAB_COMPLETION
 static const char * FAST_FUNC
-get_builtin_name(int i)
+ash_command_name(int i)
 {
-        return /*i >= 0 &&*/ i < ARRAY_SIZE(builtintab) ? builtintab[i].name + 1 : NULL;
+        int n;
+
+        if (/*i >= 0 &&*/ i < ARRAY_SIZE(builtintab))
+                return builtintab[i].name + 1;
+        i -= ARRAY_SIZE(builtintab);
+
+        for (n = 0; n < CMDTABLESIZE; n++) {
+                struct tblentry *cmdp;
+                for (cmdp = cmdtable[n]; cmdp; cmdp = cmdp->next) {
+                        if (cmdp->cmdtype == CMDFUNCTION && --i < 0)
+                                return cmdp->cmdname;
+                }
+        }
+
+# if ENABLE_ASH_ALIAS
+        for (n = 0; n < ATABSIZE; n++) {
+                struct alias *ap;
+                for (ap = atab[n]; ap; ap = ap->next) {
+                        if (--i < 0)
+                                return ap->name;
+                }
+        }
+#endif
+
+        return NULL;
 }
 #endif