Add lint to project and fix warnings

Signed-off-by: Arthur Diniz <[email protected]>

Author: arthurbdiniz

README.md

@@ -113,6 +113,21 @@ script:
 ./tests/tests.sh
 ```
 
+# Lint
+
+To lint the shell scripts, you need to install `shellcheck` and `checkbashisms`. Those tools will check the scripts for issues and ensure they follow best practices.
+
+- On Debian-like systems: `apt install shellcheck devscripts`
+- On Fedora-like systems: `dnf install shellcheck devscripts`
+
+After installation, you can run `shellcheck` and `checkbashisms` by executing the following commands:
+
+```sh
+shellcheck wcurl ./tests/*
+
+checkbashisms wcurl ./tests/*
+```
+
 # Authors
 
 Samuel Henrique <[[email protected]](mailto:[email protected])>  

tests/tests.sh

@@ -26,7 +26,8 @@
 #
 # SPDX-License-Identifier: curl
 
-readonly ROOTDIR=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
+ROOTDIR=$(CDPATH=$(cd -- "$(dirname -- "$0")/.." && pwd))
+readonly ROOTDIR
 export PATH="${ROOTDIR}:${PATH}"
 
 readonly WCURL_CMD="wcurl --dry-run "
@@ -67,8 +68,9 @@ testParallelIfMoreThanOneUrl()
 {
     # TODO: This test is wrong for curl 7.65 or older, since --parallel was only introduced in 7.66.
     #       We should check curl's version and skip this test instead.
-    urls='example.com/1 example.com/2'
-    ret=$(${WCURL_CMD} ${urls})
+    url_1='example.com/1'
+    url_2='example.com/2'
+    ret=$(${WCURL_CMD} ${url_1} ${url_2})
     assertContains "Verify whether 'wcurl' uses '--parallel' if more than one url is provided" "${ret}" '--parallel'
 }
 
@@ -82,24 +84,26 @@ testEncodingWhitespace()
 testDoubleDash()
 {
     params='example.com --curl-options=abc'
-    ret=$(${WCURL_CMD} -- ${params})
+    ret=$(${WCURL_CMD} -- "${params}")
     assertTrue "Verify whether 'wcurl' accepts '--' without erroring" "$?"
     assertContains "Verify whether 'wcurl' considers everywhing after '--' a url" "${ret}" '--curl-options=abc'
 }
 
 testCurlOptions()
 {
     params='example.com --curl-options=--foo --curl-options --bar'
-    ret=$(${WCURL_CMD} ${params})
+    ret=$(${WCURL_CMD} "${params}")
     assertTrue "Verify 'wcurl' accepts '--curl-options' with and without trailing '='" "$?"
     assertContains "Verify 'wcurl' correctly passes through --curl-options=<option>" "${ret}" '--foo'
     assertContains "Verify 'wcurl' correctly passes through --curl-options <option>" "${ret}" '--bar'
 }
 
 testNextAmount()
 {
-    urls='example.com/1 example.com/2 example.com3'
-    ret=$(${WCURL_CMD} ${urls})
+    url_1='example.com/1'
+    url_2='example.com/2'
+    url_3='example.com3'
+    ret=$(${WCURL_CMD} ${url_1} ${url_2} ${url_3})
     next_count=$(printf '%s' "${ret}" | grep -c -- --next)
     assertEquals "Verify whether 'wcurl' includes '--next' for every url besides the first" "${next_count}" "2"
 }
@@ -168,7 +172,7 @@ testUrlDecodingDisabled()
 testUrlDecodingWhitespacesQueryString()
 {
     url='example.com/filename%20with%20spaces?query=string'
-    ret=$(${WCURL_CMD} ${url} 2>&1)
+    ret=$(${WCURL_CMD} "${url}" 2>&1)
     assertContains "Verify whether 'wcurl' successfully decodes percent-encoded whitespaces in URLs with query strings" "${ret}" 'filename with spaces'
 }
 
@@ -217,4 +221,5 @@ testUrlDecodingNonLatinLanguages()
 ## - Options are the same for all URLs (except --next)
 ## - URLs beginning with '-' (with and without using '--')
 
+# shellcheck disable=SC1091
 . shunit2