nitpm: support installing a specific package version

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/src/picnit.nit b/src/picnit.nit
index bac74eb..753492b 100644 (file)
--- a/src/picnit.nit
+++ b/src/picnit.nit
@@ -55,7 +55,7 @@ class CommandInstall
        super Command
 
        redef fun name do return "install"
-       redef fun usage do return "picnit install [package0 [package1 ...]]"
+       redef fun usage do return "picnit install [package0[=version] [package1 ...]]"
        redef fun description do return "Install packages by name, Git repository address or from the local package.ini"
 
        redef fun apply(args)
@@ -141,12 +141,12 @@ class CommandInstall
                                abort
                        end
 
-                       install_from_git(git_repo, package_id)
+                       install_from_git(git_repo, package_id, version)
                else
                        var name = package_id.git_name
                        if name != null and name != "." and not name.is_empty then
                                name = name.to_lower
-                               install_from_git(package_id, name)
+                               install_from_git(package_id, name, version)
                        else
                                print_error "Failed to infer the package name"
                                exit 1
@@ -154,17 +154,21 @@ class CommandInstall
                end
        end
 
-       private fun install_from_git(git_repo, name: String)
+       private fun install_from_git(git_repo, name: String, version: nullable String)
        do
                check_git
 
                var target_dir = picnit_lib_dir / name
+               if version != null then target_dir += "=" + version
                if target_dir.file_exists then
                        print_error "Already installed"
                        exit 1
                end
 
-               var cmd = "git clone {git_repo.escape_to_sh} {target_dir.escape_to_sh}"
+               var cmd_branch = ""
+               if version != null then cmd_branch = "--branch '{version}'"
+
+               var cmd = "git clone --depth 1 {cmd_branch} {git_repo.escape_to_sh} {target_dir.escape_to_sh}"
                if verbose then print "+ {cmd}"
 
                if "NIT_TESTING".environ == "true" then