Fix: syntax error when comparing number of arguments

.gitignore

@@ -0,0 +1,3 @@
+/pkg
+/src
+/proxyenv*.pkg.tar.*

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Leafee98
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

PKGBUILD

@@ -0,0 +1,30 @@
+pkgname='proxyenv-git'
+pkgver=0
+pkgrel=1
+arch=('any')
+url="https://git.leafee98.com/leafee98/proxyenv"
+pkgdesc="A cross-platform, GPU-accelerated terminal emulator"
+license=('MIT')
+depends=('bash')
+
+source=(
+    "proxyenv"
+    "proxyenv.conf"
+    "LICENSE"
+)
+
+sha256sums=(
+    'SKIP'
+    'SKIP'
+    'SKIP'
+)
+
+pkgver() {
+    git describe --tags --long  | cut -c 2- | sed -e 's/-/./g'
+}
+
+package() {
+    install -Dm755 "${srcdir}/proxyenv" "${pkgdir}/usr/bin/proxyenv"
+    install -Dm644 "${srcdir}/proxyenv.conf" "${pkgdir}/etc/proxyenv.conf"
+    install -Dm644 "${srcdir}/LICENSE" "${pkgdir}/usr/share/licenses/proxyenv/LICENSE"
+}

README.md

@@ -0,0 +1,48 @@
+# proxyenv
+
+This program is designed to be used like proxychains, that is
+
+`proxyenv <any program> <any arguments for the program>`
+
+This program used to be a simple bash function, firsted introduced
+at [A shell function to set environemt for any single command (Title has been translated)](https://blog.leafee98.com/posts/%E4%B8%BA%E5%8D%95%E4%B8%80%E5%91%BD%E4%BB%A4%E8%AE%BE%E7%BD%AE%E4%BB%A3%E7%90%86%E7%8E%AF%E5%A2%83%E5%8F%98%E9%87%8F%E7%9A%84%E7%BB%88%E7%AB%AF%E5%87%BD%E6%95%B0/).
+
+It works most of the time, but when using other command wrappers like `sudo proxyenv cmd`,
+the shell function will not work anymore, because in the context of sudo, the function
+proxyenv is inaccessible.
+
+So I make it as an bash script, which still accessible inside any other program wrappers,
+that's this program.
+
+## Usage
+
+```
+proxyenv <any program> <any arguments>
+```
+
+## Configuration
+
+If environemt `PROXYENV_CONFPATH` is set, the program will use the path indicted by it to
+read the proxy actually to be used. Otherwise `/etc/proxyenv.conf` will be used.
+
+The configuration file (default `/etc/proxyenv.conf`) will be sourced when proxyenv run,
+so take care no let this file's permission to open, 755 is suggested.
+
+For entry detail of configuration file, see `proxyenv.conf` in this repository.
+
+## Misc
+
+### Which version to use
+
+Althought there are tags, using the code on branch `main` is always suggested. The tag
+was added just to let `git describe` happy, which used in `PKGBUILD`
+
+### Install on Archlinux
+
+Since I add a PKGBUILD at the root of repository, you can use the following command
+to build and install this program on Archlinux.
+
+```
+makepkg
+pacman -U <generated package>
+```

proxyenv

@@ -1,11 +1,16 @@
 #!/usr/bin/env bash
 
+# Just quit queitly when no program specfied
+if (( "$#" == 0 )) ; then
+    exit 0
+fi
+
 if [[ -z "$PROXYENV_CONFPATH" ]] ; then
     if [[ -e "/etc/proxyenv.conf" ]] ; then
         source "/etc/proxyenv.conf"
     else
         echo "custom configuration location '/etc/proxyenv.conf' not exists" >&2
-        echo "exiting...'
+        echo "exiting..."
         exit 1
     fi
 else
@@ -13,14 +18,14 @@ else
         source "$PROXYENV_CONFPATH"
     else
         echo "custom configuration location '$PROXYENV_CONFPATH' not exists" >&2
-        echo "exiting...'
+        echo "exiting..."
         exit 1
     fi
 fi
 
 if [[ -z "$PROXYENV_TARGET_PROXY" ]] ; then
     echo "cannot find PROXYENV_TARGET_PROXY" >&2
-    echo "exiting...'
+    echo "exiting..."
     exit 1
 fi