[PATCH 4/5] cli: Implement .ifenv meta command

[pmeerw@xxxxxxxxxx (Peter Meerwald)]

Signed-off-by: Peter Meerwald <pmeerw at pmeerw.net>
---
 src/pulsecore/cli-command.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/pulsecore/cli-command.c b/src/pulsecore/cli-command.c
index 6a38dd9..6434f43 100644
--- a/src/pulsecore/cli-command.c
+++ b/src/pulsecore/cli-command.c
@@ -70,6 +70,7 @@ struct command {
 #define META_FAIL ".fail"
 #define META_NOFAIL ".nofail"
 #define META_IFEXISTS ".ifexists"
+#define META_IFENV ".ifenv"
 #define META_ELSE ".else"
 #define META_ENDIF ".endif"
 
@@ -2118,6 +2119,28 @@ int pa_cli_command_execute_line_stateful(pa_core *c, const char *s, pa_strbuf *b
                     const char *filename = cs+l+strspn(cs+l, whitespace);
                     *ifstate = pa_module_exists(filename) ? IFSTATE_TRUE : IFSTATE_FALSE;
                 }
+            } else if (l == sizeof(META_IFENV)-1 && !strncmp(cs, META_IFENV, l)) {
+                if (!pa_cli_check_ifstate(buf, ifstate, cs))
+                    return -1;
+                else {
+                    const char *e = cs+l+strspn(cs+l, whitespace);
+                    char *envname;
+
+                    *ifstate = IFSTATE_FALSE;
+                    l = strcspn(e, whitespace);
+
+                    if ((envname = pa_xstrndup(e, l)) != NULL) {
+                        char *ev = getenv(envname);
+                        if (ev) {
+                            const char *v = e+l+strspn(e+l, whitespace);
+                            l = strcspn(v, whitespace);
+                            *ifstate = !l || !strncmp(ev, v,
+                                PA_MAX(strlen(ev), l)) ?
+                                IFSTATE_TRUE : IFSTATE_FALSE;
+                        }
+                        pa_xfree(envname);
+                    }
+                }
             } else {
                 pa_strbuf_printf(buf, "Invalid meta command: %s\n", cs);
                 if (*fail) return -1;
-- 
1.9.1