_parse_help, _parse_usage: If first arg is "-", read from stdin.

3 files changed, 16 insertions, 4 deletions

diff --git a/bash_completion b/bash_completion
index ac5842a1..9bd43bdd 100644
--- a/bash_completion
+++ b/bash_completion
@@ -735,14 +735,15 @@ __parse_options()
 }
 
 # Parse GNU style help output of the given command.
-# @param $1  command
+# @param $1  command; if "-", read from stdin and ignore rest of args
 # @param $2  command options (default: --help)
 #
 _parse_help()
 {
     eval local cmd=$1
     local line
-    "$cmd" ${2:---help} 2>&1 | while read -r line; do
+    { case $cmd in -) cat ;; *) "$cmd" ${2:---help} 2>&1 ;; esac } \
+    | while read -r line; do
 
         [[ $line == *([ $'\t'])-* ]] || continue
         # transform "-f FOO, --foo=FOO" to "-f , --foo=FOO" etc
@@ -756,14 +757,15 @@ _parse_help()
 }
 
 # Parse BSD style usage output (options in brackets) of the given command.
-# @param $1  command
+# @param $1  command; if "-", read from stdin and ignore rest of args
 # @param $2  command options (default: --usage)
 #
 _parse_usage()
 {
     eval local cmd=$1
     local line match option i char
-    "$cmd" ${2:---usage} 2>&1 | while read -r line; do
+    { case $cmd in -) cat ;; *) "$cmd" ${2:---usage} 2>&1 ;; esac } \
+    | while read -r line; do
 
         while [[ $line =~ \[[[:space:]]*(-[^]]+)[[:space:]]*\] ]]; do
             match=${BASH_REMATCH[0]}
diff --git a/test/unit/_parse_help.exp b/test/unit/_parse_help.exp
index a6d58d5a..43c5dc29 100644
--- a/test/unit/_parse_help.exp
+++ b/test/unit/_parse_help.exp
@@ -7,6 +7,7 @@ proc setup {} {
 proc teardown {} {
     assert_env_unmodified {
         /declare -f fn/d
+        /PIPESTATUS=/d
     }
 }
 
@@ -129,5 +130,9 @@ set cmd {fn() { printf '%s\n' "-f or --foo"; }; _parse_help fn}
 assert_bash_list "--foo" $cmd "-f or --foo"
 sync_after_int
 
+set cmd { printf '%s\n' "-f or --foo" | _parse_help - }
+assert_bash_list "--foo" $cmd "from stdin"
+sync_after_int
+
 
 teardown
diff --git a/test/unit/_parse_usage.exp b/test/unit/_parse_usage.exp
index 0069848d..5a40b1fe 100644
--- a/test/unit/_parse_usage.exp
+++ b/test/unit/_parse_usage.exp
@@ -5,6 +5,7 @@ proc setup {} {
 proc teardown {} {
     assert_env_unmodified {
         /declare -f fn/d
+        /PIPESTATUS=/d
     }
 }
 
@@ -55,5 +56,9 @@ set cmd {fn() { printf '%s\n' "----\n---foo\n----- bar"; }; _parse_usage fn}
 assert_bash_list "" $cmd "many dashes"
 sync_after_int
 
+set cmd { printf '%s\n' "[-duh]" | _parse_usage - }
+assert_bash_list "-d -u -h" $cmd "from stdin"
+sync_after_int
+
 
 teardown