improvement: externalized files

src/sh/config.sh

@@ -0,0 +1,65 @@
+# Load Configuration
+# - ROOT:                 Directory containing the collections
+# - COLLECTION_LABELS:    Mappings between collections and labels
+# - SYNC_CMD (optional):  Synchronization command
+# - DAY_START (optional): Hour of start of the day (defaults to 8)
+# - DAY_END (optional):   Hour of end of the day (defaults to 18)
+# - EDITOR (optional):    Your favorite editor, is usually already exported
+# - TZ (optional):        Your favorite timezone, usually system's choice
+# - LC_TIME (optional):   Your favorite locale for date and time
+# - ZI_DIR (optional):    Location of tzdata, defaults to /usr/share/zoneinfo
+
+CONFIGFILE="$HOME/.config/fzf-vcal/config"
+if [ ! -f "$CONFIGFILE" ]; then
+  err "Configuration '$CONFIGFILE' not found."
+  exit 1
+fi
+# shellcheck source=/dev/null
+. "$CONFIGFILE"
+if [ -z "${ROOT:-}" ] || [ -z "${COLLECTION_LABELS:-}" ]; then
+  err "Configuration is incomplete."
+  exit 1
+fi
+SYNC_CMD=${SYNC_CMD:-echo 'Synchronization disabled'}
+DAY_START=${DAY_START:-8}
+DAY_END=${DAY_END:-18}
+ZI_DIR=${ZI_DIR:-/usr/share/zoneinfo/posix}
+if [ ! -d "$ZI_DIR" ]; then
+  err "Could not determine time-zone information"
+  exit 1
+fi
+OPEN=${OPEN:-open}
+
+# Check and load required tools
+# - FZF:     Fuzzy finder `fzf``
+# - UUIDGEN: Tool `uuidgen` to generate random uids
+# - CAT:     `bat` or `batcat` or `cat`
+# - GIT:     `git` if it exists
+#
+# The presence of POSIX tools is not checked.
+
+if command -v "fzf" >/dev/null; then
+  FZF="fzf --black"
+else
+  err "Did not find the command-line fuzzy finder fzf."
+  exit 1
+fi
+
+if command -v "uuidgen" >/dev/null; then
+  UUIDGEN="uuidgen"
+else
+  err "Did not find the uuidgen command."
+  exit 1
+fi
+
+if command -v "bat" >/dev/null; then
+  CAT="bat"
+elif command -v "batcat" >/dev/null; then
+  CAT="batcat"
+fi
+CAT=${CAT:+$CAT --color=always --style=numbers --language=md}
+CAT=${CAT:-cat}
+
+if command -v "git" >/dev/null && [ -d "$ROOT/.git" ]; then
+  GIT="git -C $ROOT"
+fi