From 22da15a9ffd7d33c72272302248d27d042afd427 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Mon, 12 Oct 2015 14:28:04 +1300
Subject: New function fnl()

---
 bash/bashrc.d/fnl.bash | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 bash/bashrc.d/fnl.bash

(limited to 'bash/bashrc.d')

diff --git a/bash/bashrc.d/fnl.bash b/bash/bashrc.d/fnl.bash
new file mode 100644
index 00000000..09d1af61
--- /dev/null
+++ b/bash/bashrc.d/fnl.bash
@@ -0,0 +1,45 @@
+# Run a command and push its stdout and stderr into temporary files, printing
+# the names of the files once done, and saving them into two variables. Return
+# the exit status of the command.
+#
+#     $ fnl grep foo /bar
+#     declare -- fnl_stdout="/tmp/fnl.xQmhe/stdout"
+#     declare -- fnl_stderr="/tmp/fnl.xQmhe/stderr"
+#
+fnl() {
+
+    # Must be called with at least one command argument
+    if ! (($#)) ; then
+        printf 'bash: %s: usage: %s COMMAND [ARG1 ...]\n' \
+            "$FUNCNAME" "$FUNCNAME" >&2
+        return 2
+    fi
+
+    # Try to stop infinitely recursive calls
+    if [[ $1 == "$FUNCNAME" ]] ; then
+        printf 'bash: %s: Cannot nest calls\n' \
+            "$FUNCNAME" >&2
+        return 2
+    fi
+
+    # Create a temporary directory or bail
+    local template dir
+    template=$FUNCNAME.$1.XXXXX
+    if ! dir=$(mktemp -dt -- "$template") ; then
+        return
+    fi
+
+    # Run the command and save its exit status
+    local ret
+    command "$@" >"$dir"/stdout 2>"$dir"/stderr
+    ret=$?
+
+    # Note these are *not* local variables
+    # shellcheck disable=SC2034
+    fnl_stdout=$dir/stdout fnl_stderr=$dir/stderr
+    declare -p fnl_std{out,err}
+
+    # Return the exit status of the command, not the declare builtin
+    return "$ret"
+}
+
-- 
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