From 7ca836a05e81aeac0758b10d220e4b618c854ea8 Mon Sep 17 00:00:00 2001
From: Ian Kelling <ian@iankelling.org>
Date: Mon, 16 Jun 2014 22:36:37 -0700
Subject: [PATCH] add pipe input

---
 appendu          | 24 +++++++++++++++++-------
 appendu-function | 24 +++++++++++++++++-------
 2 files changed, 34 insertions(+), 14 deletions(-)

diff --git a/appendu b/appendu
index f08a45c..c7455dc 100755
--- a/appendu
+++ b/appendu
@@ -3,8 +3,10 @@
 # This program is under GPL v. 3 or later, see <http://www.gnu.org/licenses/>
 
 appendu() {
-    local help="Usage: appendu [OPTION]... FILE LINE...
-Append unique. Append each LINE to FILE if it does not exist in FILE.
+    local help="Usage: appendu [OPTION]... FILE [LINE]...
+Append unique.
+Append each line to FILE if it does not exist in FILE.
+Use LINE if specified, else use lines from stdin.
 Appended lines are output to the terminal.
 
   -s      don't try to use sudo when it would help us read or write the file
@@ -28,8 +30,8 @@ Appended lines are output to the terminal.
         fi
     done
     
-    if (( ${#@} < 2 )); then
-        echo "error: need 2 or more arguments"
+    if [[ ${#@} == 0 ]]; then
+        echo "error: need 1 or more arguments"
         echo "$help"
         return 1
     fi
@@ -54,8 +56,16 @@ Appended lines are output to the terminal.
         readsudo=
         writesudo=
     fi
-    for x in "$@"; do
-        [[ -e "$file" ]] && $readsudo grep -q "^$x$" "$file" || $writesudo tee -a "$file"<<<"$x"
-    done
+    if [[ $@ ]]; then
+        for x in "$@"; do
+            [[ -e "$file" ]] && $readsudo grep -q "^$x$" "$file" || $writesudo tee -a "$file"<<<"$x"
+        done
+    elif [[ ! -t 0 ]]; then
+        unset IFS
+        while read -r x; do
+            # duplicated from above
+            [[ -e "$file" ]] && $readsudo grep -q "^$x$" "$file" || $writesudo tee -a "$file"<<<"$x"
+        done
+    fi
 }
 appendu "$@"
diff --git a/appendu-function b/appendu-function
index 7a11f28..40a4edf 100644
--- a/appendu-function
+++ b/appendu-function
@@ -3,8 +3,10 @@
 # This program is under GPL v. 3 or later, see <http://www.gnu.org/licenses/>
 
 appendu() {
-    local help="Usage: appendu [OPTION]... FILE LINE...
-Append unique. Append each LINE to FILE if it does not exist in FILE.
+    local help="Usage: appendu [OPTION]... FILE [LINE]...
+Append unique.
+Append each line to FILE if it does not exist in FILE.
+Use LINE if specified, else use lines from stdin.
 Appended lines are output to the terminal.
 
   -s      don't try to use sudo when it would help us read or write the file
@@ -28,8 +30,8 @@ Appended lines are output to the terminal.
         fi
     done
     
-    if (( ${#@} < 2 )); then
-        echo "error: need 2 or more arguments"
+    if [[ ${#@} == 0 ]]; then
+        echo "error: need 1 or more arguments"
         echo "$help"
         return 1
     fi
@@ -54,7 +56,15 @@ Appended lines are output to the terminal.
         readsudo=
         writesudo=
     fi
-    for x in "$@"; do
-        [[ -e "$file" ]] && $readsudo grep -q "^$x$" "$file" || $writesudo tee -a "$file"<<<"$x"
-    done
+    if [[ $@ ]]; then
+        for x in "$@"; do
+            [[ -e "$file" ]] && $readsudo grep -q "^$x$" "$file" || $writesudo tee -a "$file"<<<"$x"
+        done
+    elif [[ ! -t 0 ]]; then
+        unset IFS
+        while read -r x; do
+            # duplicated from above
+            [[ -e "$file" ]] && $readsudo grep -q "^$x$" "$file" || $writesudo tee -a "$file"<<<"$x"
+        done
+    fi
 }
-- 
2.30.2