install.sh: Implement flag parsing

ci/release/_install.sh

@@ -13,7 +13,7 @@ help() {
   fi
 
   cat <<EOF
-usage: $arg0 [--dryrun] [--version vX.X.X] [--edge] [--method detect] [--prefix ~/.local]
+usage: $arg0 [--dry-run] [--version vX.X.X] [--edge] [--method detect] [--prefix ~/.local]
   [--tala] [--tala-version vX.X.X] [--force] [--uninstall]
 
 install.sh automates the installation of D2 onto your system. It currently only supports
@@ -22,15 +22,20 @@ source, build a release and install from it.
 
 Flags:
 
---dryrun
+--dry-run
   Pass to have install.sh show the install method and flags that will be used to install
   without executing them. Very useful to understand what changes it will make to your system.
 
 --version vX.X.X
   Pass to have install.sh install the given version instead of the latest version.
+  note: currently unimplemented.
 
 --edge
-  Pass to build and install D2 from source.
+  Pass to build and install D2 from source. This will still use --method if set to detect
+  to install the release archive for your OS, whether it's apt, yum, brew or standalone
+  if an unsupported package manager is used. To install from source like a dev would,
+  use go install oss.terrastruct.com/d2
+  note: currently unimplemented.
 
 --method [detect | standalone]
   Pass to control the method by which to install. Right now we only support standalone
@@ -55,6 +60,7 @@ Flags:
 
 --tala-version vX.X.X
   Install the passed version of tala instead of latest.
+  note: currently unimplemented.
 
 --force:
   Force installation over the existing version even if they match. It will attempt a clean
@@ -74,3 +80,68 @@ You can rerun install.sh to update your version of D2. install.sh will avoid rei
 if the installed version is the latest unless --force is passed.
 EOF
 }
+
+main() {
+  while :; do
+    flag_parse "$@"
+    case "$FLAG" in
+      h|help)
+        help
+        return 0
+        ;;
+      dry-run)
+        flag_noarg && shift "$FLAGSHIFT"
+        DRY_RUN=1
+        ;;
+      version)
+        flag_nonemptyarg && shift "$FLAGSHIFT"
+        VERSION=$FLAGARG
+        echoerr "$FLAGRAW is currently unimplemented"
+        exit 1
+        ;;
+      tala-version)
+        flag_nonemptyarg && shift "$FLAGSHIFT"
+        TALA_VERSION=$FLAGARG
+        echoerr "$FLAGRAW is currently unimplemented"
+        exit 1
+        ;;
+      edge)
+        flag_noarg && shift "$FLAGSHIFT"
+        EDGE=1
+        echoerr "$FLAGRAW is currently unimplemented"
+        exit 1
+        ;;
+      method)
+        flag_nonemptyarg && shift "$FLAGSHIFT"
+        METHOD=$FLAGARG
+        echoerr "$FLAGRAW is currently unimplemented"
+        exit 1
+        ;;
+      prefix)
+        flag_nonemptyarg && shift "$FLAGSHIFT"
+        export PREFIX=$FLAGARG
+        ;;
+      force)
+        flag_noarg && shift "$FLAGSHIFT"
+        FORCE=1
+        ;;
+      uninstall)
+        flag_noarg && shift "$FLAGSHIFT"
+        UNINSTALL=1
+        ;;
+      '')
+        shift "$FLAGSHIFT"
+        break
+        ;;
+      *)
+        flag_errusage "unrecognized flag $FLAGRAW"
+        ;;
+    esac
+  done
+
+  if [ $# -gt 0 ]; then
+    flag_errusage "no arguments are accepted"
+  fi
+}
+
+main "$@"

ci/sub

@@ -1 +1 @@
-Subproject commit 4f1fb95079b0ef0057db7ea65db5a1ca9f053dda
+Subproject commit 81e033b7702131e917a16396b44c20512d29029b