git-serve: Format usage text automatically

Remove the formatting of the usage text and add code to columnize it
automatically instead.

Also, add more strict tests for the usage output. These new tests ensure
that the usage header is printed, commands are indented properly and no
overly long lines are produced.

Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

2 files changed, 27 insertions, 9 deletions

diff --git a/git-interface/git-serve.py b/git-interface/git-serve.py
index 38048c9..0187de9 100755
--- a/git-interface/git-serve.py
+++ b/git-interface/git-serve.py
@@ -117,6 +117,14 @@ def warn(msg):
     sys.stderr.write("warning: {:s}\n".format(msg))
 
 
+def usage(cmds):
+    sys.stderr.write("Commands:\n")
+    colwidth = max([len(cmd) for cmd in cmds.keys()]) + 4
+    for key in sorted(cmds):
+        sys.stderr.write("  " + key.ljust(colwidth) + cmds[key] + "\n")
+    exit(0)
+
+
 user = os.environ.get('AUR_USER')
 privileged = (os.environ.get('AUR_PRIVILEGED', '0') == '1')
 ssh_cmd = os.environ.get('SSH_ORIGINAL_COMMAND')
@@ -187,13 +195,15 @@ elif action == 'restore':
     os.environ["AUR_PKGBASE"] = pkgbase
     os.execl(git_update_cmd, git_update_cmd, 'restore')
 elif action == 'help':
-    die("Commands:\n" +
-        "  help                         Show this help message and exit.\n" +
-        "  list-repos                   List all your repositories.\n" +
-        "  restore <name>               Restore a deleted package base.\n" +
-        "  set-keywords <name> [...]    Change package base keywords.\n" +
-        "  setup-repo <name>            Create a repository (deprecated).\n" +
-        "  git-receive-pack             Internal command used with Git.\n" +
-        "  git-upload-pack              Internal command used with Git.")
+    cmds = {
+        "help": "Show this help message and exit.",
+        "list-repos": "List all your repositories.",
+        "restore <name>": "Restore a deleted package base.",
+        "set-keywords <name> [...]": "Change package base keywords.",
+        "setup-repo <name>": "Create a repository (deprecated).",
+        "git-receive-pack": "Internal command used with Git.",
+        "git-upload-pack": "Internal command used with Git.",
+    }
+    usage(cmds)
 else:
     die_with_help("invalid command: {:s}".format(action))
diff --git a/git-interface/test/t0002-serve.sh b/git-interface/test/t0002-serve.sh
index 52fdcd1..ce8340e 100755
--- a/git-interface/test/t0002-serve.sh
+++ b/git-interface/test/t0002-serve.sh
@@ -9,7 +9,15 @@ test_expect_success 'Test interactive shell.' '
 '
 
 test_expect_success 'Test help.' '
-	SSH_ORIGINAL_COMMAND=help "$GIT_SERVE" 2>&1 | grep -q "^Commands:$"
+	SSH_ORIGINAL_COMMAND=help "$GIT_SERVE" 2>actual &&
+	save_IFS=$IFS
+	IFS=
+	while read -r line; do
+		echo $line | grep -q "^Commands:$" && continue
+		echo $line | grep -q "^  [a-z]" || return 1
+		[ ${#line} -le 80 ] || return 1
+	done <actual
+	IFS=$save_IFS
 '
 
 test_expect_success 'Test setup-repo and list-repos.' '