Use a single line cache file

In c7c894a, a per-selection line-cache was introduced in order to
overcome some of the limitations of clipmenu at the time (for example,
missing duplicate detection). However, now we have all the features we
need to have a single line cache again, and having multiple line caches
has caused more trouble than it is worth.

For example, maintaining CM_MAX_CLIPS globally is extremely cumbersome,
so we don't do it, and CM_MAX_CLIPS is actually acted on per-selection.
We also have had bugs where we perform actions on cache files without
properly consulting other line caches, and while those can be fixed, the
simplest thing to do now is just to go back to having a single line
cache.

.travis.yml

@@ -3,7 +3,7 @@ language: bash
 dist: xenial
 
 script:
-  - shellcheck -s bash clipmenu clipmenud
+  - shellcheck -s bash clipmenu clipmenud clipdel clipfsck
   - tests/test-clipmenu
 
 matrix:

clipdel

@@ -7,12 +7,12 @@ if [[ $1 == -d ]]; then
     shift
 fi
 
-major_version=5
+major_version=6
 
 shopt -s nullglob
 
 cache_dir=$CM_DIR/clipmenu.$major_version.$USER
-cache_file_prefix=$cache_dir/line_cache
+cache_file=$cache_dir/line_cache
 lock_file=$cache_dir/lock
 lock_timeout=2
 
@@ -35,10 +35,8 @@ EOF
     exit 0
 fi
 
-line_cache_files=( "$cache_file_prefix"_* )
-
-if (( ${#line_cache_files[@]} == 0 )); then
-    printf '%s\n' "No line cache files found, no clips exist" >&2
+if ! [[ -f $cache_file ]]; then
+    printf '%s\n' "No line cache file found, no clips exist" >&2
     exit 0  # Well, this is a kind of success...
 fi
 
@@ -64,7 +62,7 @@ if (( CM_REAL_DELETE )) && [[ "$raw_pattern" == ".*" ]]; then
     exit 0
 else
     mapfile -t matches < <(
-        sed -n "${sed_common_command}p" "${line_cache_files[@]}" |
+        sed -n "${sed_common_command}p" "$cache_file" |
             sort -u
     )
 
@@ -76,15 +74,13 @@ else
             rm -f -- "$cache_dir/$ck"
         done
 
-        for file in "${line_cache_files[@]}"; do
-            temp=$(mktemp)
-            # sed 'h' and 'g' here means save and restore the line, so
-            # timestamps are not removed from non-deleted lines. 'd' deletes the
-            # line and restarts, skipping 'g'/restore.
-            # https://www.gnu.org/software/sed/manual/html_node/Other-Commands.html#Other-Commands
-            sed "h;${sed_common_command}d;g" "$file" > "$temp"
-            mv -- "$temp" "$file"
-        done
+        temp=$(mktemp)
+        # sed 'h' and 'g' here means save and restore the line, so
+        # timestamps are not removed from non-deleted lines. 'd' deletes the
+        # line and restarts, skipping 'g'/restore.
+        # https://www.gnu.org/software/sed/manual/html_node/Other-Commands.html#Other-Commands
+        sed "h;${sed_common_command}d;g" "$cache_file" > "$temp"
+        mv -- "$temp" "$cache_file"
 
         flock -u "$lock_fd"
     else

clipfsck

@@ -2,12 +2,12 @@
 
 : "${CM_DIR="${XDG_RUNTIME_DIR-"${TMPDIR-/tmp}"}"}"
 
-major_version=5
+major_version=6
 
 shopt -s nullglob
 
 cache_dir=$CM_DIR/clipmenu.$major_version.$USER
-cache_file_prefix=$cache_dir/line_cache
+cache_file=$cache_dir/line_cache
 
 declare -A cksums
 
@@ -16,11 +16,11 @@ while IFS= read -r line; do
     cksums["$cksum"]="$line"
 
     # Are all cache entries represented by a file?
-    cache_file=$cache_dir/$cksum
-    if ! [[ -f $cache_file ]]; then
-        printf 'cache entry without file: %s -> %s\n' "$line" "$cache_file" >&2
+    full_file=$cache_dir/$cksum
+    if ! [[ -f $full_file ]]; then
+        printf 'cache entry without file: %s -> %s\n' "$line" "$full_file" >&2
     fi
-done < <(cat "$cache_file_prefix"_* /dev/null | cut -d' ' -f2-)
+done < <(cut -d' ' -f2- < "$cache_file")
 
 # Are all files represented by a cache entry?
 for file in "$cache_dir"/[012346789]*; do

clipmenu

@@ -4,12 +4,12 @@
 : "${CM_DIR="${XDG_RUNTIME_DIR-"${TMPDIR-/tmp}"}"}"
 : "${CM_HISTLENGTH=8}"
 
-major_version=5
+major_version=6
 
 shopt -s nullglob
 
 cache_dir=$CM_DIR/clipmenu.$major_version.$USER
-cache_file_prefix=$cache_dir/line_cache
+cache_file=$cache_dir/line_cache
 
 if [[ $1 == --help ]] || [[ $1 == -h ]]; then
     cat << 'EOF'
@@ -33,7 +33,7 @@ if [[ "$CM_LAUNCHER" == rofi ]]; then
 fi
 
 list_clips() {
-    cat "$cache_file_prefix"_* /dev/null | LC_ALL=C sort -rnk 1 | cut -d' ' -f2- | awk '!seen[$0]++'
+    LC_ALL=C sort -rnk 1 < "$cache_file" | cut -d' ' -f2- | awk '!seen[$0]++'
 }
 
 if [[ "$CM_LAUNCHER" == rofi-script ]]; then
@@ -59,7 +59,7 @@ if ! [[ -f "$file" ]]; then
     # We didn't find this in cache
     printf 'FATAL: %s not in cache (%s missing)\n' "$chosen_line" "$file" >&2
     printf 'Please report the following debug information:\n\n' >&2
-    wc -l "$cache_file_prefix"_* >&2
+    wc -l "$cache_file" >&2
     grep -nFR "$chosen_line" "$cache_dir" >&2
     stat "$file" >&2
     exit 2

clipmenud

@@ -15,9 +15,9 @@ CM_MAX_CLIPS_THRESH=$(( CM_MAX_CLIPS + 100 ))
 # shellcheck disable=SC2153
 : "${CM_SELECTIONS=clipboard primary}"
 
-major_version=5
+major_version=6
 cache_dir=$CM_DIR/clipmenu.$major_version.$USER/
-cache_file_prefix=$cache_dir/line_cache
+cache_file=$cache_dir/line_cache
 
 # lock_file is the lock for *one* iteration of clipboard capture/propagation.
 # session_lock_file is the lock to prevent multiple clipmenud daemons from
@@ -186,7 +186,6 @@ while true; do
     fi
 
     for selection in "${cm_selections[@]}"; do
-        cache_file=${cache_file_prefix}_$selection
         data=$(_xsel -o --"$selection"; printf x)
 
         debug "Data before stripping: $data"

tests/test-clipmenu

@@ -6,9 +6,9 @@ set -o pipefail
 
 : "${CM_DIR="${XDG_RUNTIME_DIR-"${TMPDIR-/tmp}"}"}"
 
-major_version=5
+major_version=6
 dir=$CM_DIR/clipmenu.$major_version.$USER
-cache_file=$dir/line_cache_primary
+cache_file=$dir/line_cache
 
 if [[ $0 == /* ]]; then
     location=${0%/*}

tests/test-perf

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-major_version=5
+major_version=6
 
 msg() {
     printf '>>> %s\n' "$@" >&2
@@ -9,7 +9,7 @@ msg() {
 : "${CM_DIR="${XDG_RUNTIME_DIR-"${TMPDIR-/tmp}"}"}"
 
 dir=$CM_DIR/clipmenu.$major_version.$USER
-cache_file=$dir/line_cache_primary
+cache_file=$dir/line_cache
 
 log=$(mktemp)
 tim=$(mktemp)