Prefer $XDG_RUNTIME_DIR for storage

Closes #51.

clipmenu

@@ -1,13 +1,13 @@
 #!/bin/bash
 
 : "${CM_LAUNCHER=dmenu}"
-: "${TMPDIR=/tmp}"
+: "${CM_DIR="${XDG_RUNTIME_DIR-"${TMPDIR-/tmp}"}"}"
 
 major_version=3
 
 shopt -s nullglob
 
-cache_dir=$TMPDIR/clipmenu.$major_version.$USER
+cache_dir=$CM_DIR/clipmenu.$major_version.$USER
 cache_file=$cache_dir/line_cache
 
 if [[ $1 == --help ]] || [[ $1 == -h ]]; then
@@ -20,7 +20,7 @@ All arguments are passed through to dmenu itself.
 Environment variables:
 
 - $CM_LAUNCHER: specify a dmenu-compatible launcher (default: dmenu)
-- $TMPDIR: specify the base directory to store the cache dir in (default: /tmp)
+- $CM_DIR: specify the base directory to store the cache dir in (default: $XDG_RUNTIME_DIR, $TMPDIR, or /tmp)
 EOF
     exit 0
 fi

clipmenud

@@ -3,11 +3,11 @@
 : "${CM_ONESHOT=0}"
 : "${CM_OWN_CLIPBOARD=1}"
 : "${CM_DEBUG=0}"
-: "${TMPDIR=/tmp}"
+: "${CM_DIR="${XDG_RUNTIME_DIR-"${TMPDIR-/tmp}"}"}"
 : "${CM_MAX_CLIPS=1000}"
 
 major_version=3
-cache_dir=$TMPDIR/clipmenu.$major_version.$USER/
+cache_dir=$CM_DIR/clipmenu.$major_version.$USER/
 cache_file=$cache_dir/line_cache
 lock_file=$cache_dir/lock
 lock_timeout=2
@@ -64,7 +64,7 @@ Environment variables:
 - $CM_DEBUG: turn on debugging output (default: 0)
 - $CM_OWN_CLIPBOARD: take ownership of the clipboard (default: 1)
 - $CM_MAX_CLIPS: maximum number of clips to store, 0 for inf (default: 1000)
-- $TMPDIR: specify the base directory to store the cache dir in (default: /tmp)
+- $CM_DIR: specify the base directory to store the cache dir in (default: $XDG_RUNTIME_DIR, $TMPDIR, or /tmp)
 EOF
     exit 0
 fi

tests/test-clipmenu

@@ -4,8 +4,10 @@ set -x
 set -e
 set -o pipefail
 
+: "${CM_DIR="${XDG_RUNTIME_DIR-"${TMPDIR-/tmp}"}"}"
+
 major_version=3
-dir=/tmp/clipmenu.$major_version.$USER
+dir=$CM_DIR/clipmenu.$major_version.$USER
 cache_file=$dir/line_cache
 
 if [[ $0 == /* ]]; then

tests/test-perf

@@ -6,7 +6,9 @@ msg() {
     printf '>>> %s\n' "$@" >&2
 }
 
-dir=/tmp/clipmenu.$major_version.$USER
+: "${CM_DIR="${XDG_RUNTIME_DIR-"${TMPDIR-/tmp}"}"}"
+
+dir=$CM_DIR/clipmenu.$major_version.$USER
 cache_file=$dir/line_cache
 
 log=$(mktemp)