From affd67f4874cb252eb8271c60d0ebc81585b4e77 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Fri, 26 Jun 2015 11:31:33 +1200
Subject: Add edda(1)

---
 README.markdown |  3 +++
 bin/edda        | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 man/edda.1      | 19 ++++++++++++++++++
 3 files changed, 83 insertions(+)
 create mode 100755 bin/edda
 create mode 100644 man/edda.1

diff --git a/README.markdown b/README.markdown
index ab87294f..195c95c1 100644
--- a/README.markdown
+++ b/README.markdown
@@ -285,6 +285,9 @@ Three SSH-related scripts and their manuals are included:
 If you want to use the manuals, you may need to add `~/.local/share/man` to
 your `/etc/manpath` configuration, depending on your system.
 
+`edda(1)` provides a means to run `ed(1)` over a set of files preserving any
+options, mostly useful for scripts. There’s `--help` output and a manual page.
+
 There's also a script `han(1)` to provide a `keywordprg` for Bash script
 development that will look for `help` topics. You could use it from the shell
 too. It also has a brief manual.
diff --git a/bin/edda b/bin/edda
new file mode 100755
index 00000000..154fb415
--- /dev/null
+++ b/bin/edda
@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+#
+# edda(1) -- Run ed(1) over multiple files, duplicating stdin. Example:
+#
+#   $ edda /etc/app.d/*.conf <<EOF
+#   ,s/foo/bar/g
+#   w
+#   EOF
+#
+# Author: Tom Ryder <tom@sanctum.geek.nz>
+# Copyright: 2015
+# License: Public domain
+#
+
+# Name self
+self=edda
+
+# Define usage function
+usage() {
+    printf 'USAGE: %s [OPTS] [--] FILE1 [FILE2...]\n' "$self"
+}
+
+# Parse options out, give help if necessary
+declare -a opts
+for arg ; do
+    case $arg in
+        --help|-h|-\?)
+            usage
+            exit
+            ;;
+        --)
+            shift
+            break
+            ;;
+        -*)
+            shift
+            opts=("${opts[@]}" "$arg")
+            ;;
+    esac
+done
+
+# Duplicate stdin into a file, which we'll remove on exit
+stdin=$(mktemp) || exit
+cleanup() {
+    rm -f "$stdin"
+}
+trap cleanup EXIT
+cat > "$stdin"
+
+# Need at least one file
+if ! (($#)) ; then
+    usage >&2
+    exit 1
+fi
+
+# Run ed(1) over each file with the options and stdin given
+for file ; do
+    ed "${opts[@]}" "$file" < "$stdin"
+done
+
diff --git a/man/edda.1 b/man/edda.1
new file mode 100644
index 00000000..24c93fe9
--- /dev/null
+++ b/man/edda.1
@@ -0,0 +1,19 @@
+.TH EDDA 1 "June 2015" "Manual page for edda"
+.SH NAME
+.B edda
+\- run ed(1) over multiple files
+.SH SYNOPSIS
+.B ed [OPTS] [--] FILE1 [FILE2...]
+.SH DESCRIPTION
+Duplicate any data on stdin into a temporary file, and run ed(1) with any given
+options over each of the files given as the remaining arguments. Example:
+.P
+   $ edda /etc/app.d/*.conf <<EOF
+   ,s/foo/bar/g
+   w
+   EOF
+.SH SEE ALSO
+ed(1)
+.SH AUTHOR
+Tom Ryder <tom@sanctum.geek.nz>
+
-- 
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