Refactor helper modules for im0

1 files changed, 71 insertions, 0 deletions

diff --git a/src/lib/imagemagick.source.sh b/src/lib/imagemagick.source.sh
new file mode 100644
index 0000000..cdc909c
--- /dev/null
+++ b/src/lib/imagemagick.source.sh
@@ -0,0 +1,71 @@
+# shellcheck disable=SC2034
+resolve_imagemagick_command() {
+    local -r operation="$1"; shift
+    local -n command_ref="$1"; shift
+
+    command_ref=()
+
+    case "$operation" in
+        convert)
+            if command -v magick >/dev/null 2>&1; then
+                command_ref=(magick)
+                return
+            fi
+            if command -v convert >/dev/null 2>&1; then
+                command_ref=(convert)
+                return
+            fi
+            ;;
+        identify)
+            if command -v magick >/dev/null 2>&1; then
+                command_ref=(magick identify)
+                return
+            fi
+            if command -v identify >/dev/null 2>&1; then
+                command_ref=(identify)
+                return
+            fi
+            if command -v convert >/dev/null 2>&1; then
+                command_ref=(convert)
+                return
+            fi
+            ;;
+        *)
+            printf 'ERROR: Unknown ImageMagick operation %s\n' \
+                "$operation" >&2
+            return 1
+            ;;
+    esac
+
+    printf 'ERROR: ImageMagick is required; install magick or convert\n' >&2
+    return 127
+}
+
+imagemagick() {
+    local -a imagemagick_command=()
+
+    resolve_imagemagick_command convert imagemagick_command || return
+
+    run_with_timeout ImageMagick "$IMAGEMAGICK_TIMEOUT" \
+        "${imagemagick_command[@]}" "$@"
+}
+
+imagemagick_identify() {
+    local -a imagemagick_command=()
+
+    resolve_imagemagick_command identify imagemagick_command || return
+
+    if [ "${imagemagick_command[0]}" = convert ]; then
+        if [[ "${1:-}" = '-verbose' && $# -eq 2 ]]; then
+            run_with_timeout ImageMagick "$IMAGEMAGICK_TIMEOUT" \
+                "${imagemagick_command[@]}" "$2" -verbose info:
+        else
+            run_with_timeout ImageMagick "$IMAGEMAGICK_TIMEOUT" \
+                "${imagemagick_command[@]}" "$@" info:
+        fi
+        return
+    fi
+
+    run_with_timeout ImageMagick "$IMAGEMAGICK_TIMEOUT" \
+        "${imagemagick_command[@]}" "$@"
+}