fix: improve Fish shell support (and Cshell) (#1429)

I faced the same issue mentioned in #1299, this PR fixes the issue by
taking in account specific `set` and `unset` syntax for Fish shell.

The post install instruction (i.e : `./emsdk activate latest`) provides
wrong instructions in Fish shell and Cshell cases.
This should be fixed by this PR too, although the code is a bit
redundant and it could be more cleaner.

emsdk.py

@@ -119,10 +119,12 @@ def exit_with_error(msg):
 CSH = bool(os.getenv('EMSDK_CSH'))
 CMD = bool(os.getenv('EMSDK_CMD'))
 BASH = bool(os.getenv('EMSDK_BASH'))
+FISH = bool(os.getenv('EMSDK_FISH'))
+
 if WINDOWS and BASH:
  MSYS = True
 
-if not CSH and not POWERSHELL and not BASH and not CMD:
+if not CSH and not POWERSHELL and not BASH and not CMD and not FISH:
  # Fall back to default of `cmd` on windows and `bash` otherwise
  if WINDOWS and not MSYS:
  CMD = True
@@ -1503,6 +1505,22 @@ def find_emscripten_root(active_tools):
  return root
 
 
+# returns a tuple (string,string) of config files paths that need to used
+# to activate emsdk env depending on $SHELL, defaults to bash.
+def get_emsdk_shell_env_configs():
+ default_emsdk_env = sdk_path('emsdk_env.sh')
+ default_shell_config_file = '$HOME/.bash_profile'
+ shell = os.getenv('SHELL', '')
+ if 'zsh' in shell:
+ return (default_emsdk_env, '$HOME/.zprofile')
+ elif 'csh' in shell:
+ return (sdk_path('emsdk_env.csh'), '$HOME/.cshrc')
+ elif 'fish' in shell:
+ return (sdk_path('emsdk_env.fish'), '$HOME/.config/fish/config.fish')
+ else:
+ return (default_emsdk_env, default_shell_config_file)
+
+
 def generate_em_config(active_tools, permanently_activate, system):
  cfg = 'import os\n'
  cfg += "emsdk_path = os.path.dirname(os.getenv('EM_CONFIG')).replace('\\\\', '/')\n"
@@ -1556,22 +1574,16 @@ def generate_em_config(active_tools, permanently_activate, system):
  print('- Consider running `emsdk activate` with --permanent or --system')
  print(' to have emsdk settings available on startup.')
  else:
- emsdk_env = sdk_path('emsdk_env.sh')
  print('Next steps:')
  print('- To conveniently access emsdk tools from the command line,')
  print(' consider adding the following directories to your PATH:')
  for p in path_add:
  print(' ' + p)
  print('- This can be done for the current shell by running:')
+ emsdk_env, shell_config_file = get_emsdk_shell_env_configs()
  print(' source "%s"' % emsdk_env)
  print('- Configure emsdk in your shell startup scripts by running:')
- shell = os.getenv('SHELL', '')
- if 'zsh' in shell:
- print(' echo \'source "%s"\' >> $HOME/.zprofile' % emsdk_env)
- elif 'csh' in shell:
- print(' echo \'source "%s"\' >> $HOME/.cshrc' % emsdk_env)
- else:
- print(' echo \'source "%s"\' >> $HOME/.bash_profile' % emsdk_env)
+ print(' echo \'source "%s"\' >> %s' % (emsdk_env, shell_config_file))
 
 
 def find_msbuild_dir():
@@ -2578,6 +2590,8 @@ def unset_env(key):
  return 'set %s=\n' % key
  if CSH:
  return 'unsetenv %s;\n' % key
+ if FISH:
+ return 'set -e %s;\n' % key
  if BASH:
  return 'unset %s;\n' % key
  assert False
@@ -2599,6 +2613,8 @@ def construct_env_with_vars(env_vars_to_add):
  env_string += 'SET ' + key + '=' + value + '\n'
  elif CSH:
  env_string += 'setenv ' + key + ' "' + value + '";\n'
+ elif FISH:
+ env_string += 'set -gx ' + key + ' "' + value + '";\n'
  elif BASH:
  env_string += 'export ' + key + '="' + value + '";\n'
  else:
@@ -2616,7 +2632,7 @@ def construct_env_with_vars(env_vars_to_add):
  # of the SDK but we want to remove that from the current environment
  # if no such tool is active.
  # Ignore certain keys that are inputs to emsdk itself.
- ignore_keys = set(['EMSDK_POWERSHELL', 'EMSDK_CSH', 'EMSDK_CMD', 'EMSDK_BASH',
+ ignore_keys = set(['EMSDK_POWERSHELL', 'EMSDK_CSH', 'EMSDK_CMD', 'EMSDK_BASH', 'EMSDK_FISH'
  'EMSDK_NUM_CORES', 'EMSDK_NOTTY', 'EMSDK_KEEP_DOWNLOADS'])
  env_keys_to_add = set(pair[0] for pair in env_vars_to_add)
  for key in os.environ:

emsdk_env.fish

@@ -3,6 +3,8 @@
 #Now, when you want to use the SDK, run this alias first to set up
 #your environment.
 
+set -gx EMSDK_FISH 1
+
 set -l script (status -f)
 set -l dir (dirname $script)