Install future-fstrings to get f-strings in Python 3.5 and earlier.

scripts/install_build_environment.sh

@@ -23,28 +23,32 @@ if [ -n "`uname -a | grep -i arch`" ]
 then
     sudo pacman -Sy --noconfirm \
         python \
+        python-pip \
         make \
         m4 \
         gcc \
         patch \
         bubblewrap \
         rsync \
-        curl 
+        curl
 fi
 
 if [ -n "`uname -a | grep -i ubuntu`" ]
 then
 sudo apt-get install -y make \
      python3 \
+     python3-pip \
      make \
      m4 \
      gcc \
      patch \
      bubblewrap \
      rsync \
-     curl 
+     curl
 fi
-    
+
+pip3 install future-fstrings
+
 if [ -n "`uname -a | grep -i ubuntu`" ]
 then
     echo "ubuntu"

scripts/install_native_dependencies.sh

@@ -8,6 +8,7 @@ then
     pacman -Sy
     sudo pacman -S --noconfirm \
         python \
+        python-pip \
         libevdev \
         perl \
         pkg-config \
@@ -23,6 +24,7 @@ else
     apt-get update -qq
     apt-get -y -qq install \
         python3 \
+        python3-pip \
         libev-dev \
         perl \
         pkg-config \
@@ -34,3 +36,5 @@ else
         rsync \
         git
 fi
+
+pip3 install future-fstrings

src/stages/adt_generator/README

@@ -4,4 +4,4 @@ Build & test with:
 
 Run with
 
-    python ./generator.py
+    python3 ./generator.py

src/stages/adt_generator/dune

@@ -1,8 +1,14 @@
+(rule
+  (target generator_fstrings.py)
+  (deps generator.py)
+  (action (with-stdout-to generator_fstrings.py (run sh -c "if python3 -c 'f\"\"' 2>/dev/null; then :; else echo '# -*- coding: future_fstrings -*-'; fi; cat generator.py")))
+)
+
 (rule
   (target generated_fold.ml)
-  (deps generator.py)
-  (action (with-stdout-to generated_fold.ml (run python3 ./generator.py)))
-;  (mode (promote (until-clean))) ; If this is uncommented, then "dune build -p ligo" can't find the file (but "dune build" can)
+  (deps generator_fstrings.py)
+  (action (with-stdout-to generated_fold.ml (run python3 ./generator_fstrings.py)))
+  (mode (promote (until-clean)))
 )
 ; (library
 ;   (name adt_generator)

tools/webide/Dockerfile

@@ -21,7 +21,8 @@ FROM node:12-buster
 
 WORKDIR /app
 
-RUN apt-get update && apt-get -y install python3 libev-dev perl pkg-config libgmp-dev libhidapi-dev m4 libcap-dev bubblewrap rsync
+RUN apt-get update && apt-get -y install python3 python3-pip libev-dev perl pkg-config libgmp-dev libhidapi-dev m4 libcap-dev bubblewrap rsync
+RUN pip3 install future-fstrings
 
 COPY ligo_deb10.deb /tmp/ligo_deb10.deb
 RUN dpkg -i /tmp/ligo_deb10.deb && rm /tmp/ligo_deb10.deb