Add --bin flag for `luarocks path`, and provide cleaner variable output. Closes #76.

3 files changed, 26 insertions, 2 deletions

diff --git a/src/luarocks/cfg.lua b/src/luarocks/cfg.lua
index a8475bfe..f68380f1 100644
--- a/src/luarocks/cfg.lua
+++ b/src/luarocks/cfg.lua
@@ -274,6 +274,8 @@ if detected.windows then
       lib = { "?.dll", "lib?.dll" },
       include = { "?.h" }
    }
+   defaults.export_path = "SET PATH=%s;%s"
+   defaults.export_path_separator = ";"
    defaults.export_lua_path = "SET LUA_PATH=%s"
    defaults.export_lua_cpath = "SET LUA_CPATH=%s"
    defaults.local_cache = home.."/cache/luarocks"
@@ -317,6 +319,8 @@ if detected.unix then
       lib = { "lib?.so", "lib?.so.*" },
       include = { "?.h" }
    }
+   defaults.export_path = "export PATH='%s:%s'"
+   defaults.export_path_separator = ":"
    defaults.export_lua_path = "export LUA_PATH='%s'"
    defaults.export_lua_cpath = "export LUA_CPATH='%s'"
    defaults.local_cache = home.."/.cache/luarocks"
diff --git a/src/luarocks/path.lua b/src/luarocks/path.lua
index 03ed1b90..1c94b639 100644
--- a/src/luarocks/path.lua
+++ b/src/luarocks/path.lua
@@ -308,8 +308,12 @@ end
 --- Driver function for "path" command.
 -- @return boolean This function always succeeds.
 function run(...)
-   util.printout(cfg.export_lua_path:format(package.path))
-   util.printout(cfg.export_lua_cpath:format(package.cpath))
+   local flags = util.parse_flags(...)
+   util.printout(cfg.export_lua_path:format(util.remove_path_dupes(package.path, ';')))
+   util.printout(cfg.export_lua_cpath:format(util.remove_path_dupes(package.cpath, ';')))
+   if flags["bin"] then
+      util.printout(cfg.export_path:format(util.remove_path_dupes(os.getenv("PATH"), cfg.export_path_separator), cfg.deploy_bin_dir))
+   end
    return true
 end
 
diff --git a/src/luarocks/util.lua b/src/luarocks/util.lua
index 2955be50..1a1cccf9 100644
--- a/src/luarocks/util.lua
+++ b/src/luarocks/util.lua
@@ -326,6 +326,22 @@ function split_string(str, delim, maxNb)
    return result
 end
 
+--- Remove repeated entries from a path-style string.
+-- Example: given ("a;b;c;a;b;d", ";"), returns "a;b;c;d".
+-- @param list string: A path string (from $PATH or package.path)
+-- @param sep string: The separator
+function remove_path_dupes(list, sep)
+   local parts = split_string(list, sep)
+   local final, entries = {}, {}
+   for _, part in ipairs(parts) do
+      if not entries[part] then
+         table.insert(final, part)
+         entries[part] = true
+      end
+   end
+   return table.concat(final, sep)
+end
+
 --[[
 Author: Julio Manuel Fernandez-Diaz
 Date:   January 12, 2007