Fetch: enable cookies and storing error messages

Cargo.toml

@@ -42,6 +42,7 @@ opt-level     = 3
 opt-level = 3
 
 [dependencies]
+anyhow = "1.0"
 byteorder = "1.4"
 cached = { version = "0.26", default-features = false, features = [
     "proc_macro",
@@ -75,7 +76,7 @@ rand = "0.8"
 regex = "1"
 reqwest = { version = "0.11", features = [
     "blocking",
-    "json",
+    "cookies",
     "rustls-tls",
 ], default-features = false }
 reverse_geocoder = { version = "2", optional = true }

docs/Fetch.md

@@ -6,8 +6,8 @@ Fetch is integrated with [`jql`](https://github.com/yamafaktory/jql), with some
 
 * Primary usecase is to retrieve simple values from API JSON response, hence selectors must result in: Number, String, Bool, or Array of such.
 * Arrays of Number, String, and Bool are concatenated into String with comma separator
-* Output may contain jql error messages
-* JSON Null becomes "null" string
+* On jql error, output is blank. To see jql error message please enable `--store-error` flag
+* JSON Null becomes `"null"` string
 * Processing aborts if jql output is still a JSON
 
 
@@ -17,51 +17,83 @@ __test.csv__
 
 ```
 Country,ZipCode,URL
+US,99999,http://api.zippopotam.us/us/99999
 US,90210,http://api.zippopotam.us/us/90210
 US,94105,http://api.zippopotam.us/us/94105
 US,92802,http://api.zippopotam.us/us/92802
 ```
 
 
-### Fetch url from 3rd column of `test.csv`, apply JQL selector, and print results
+### Fetch data via 3rd column of `test.csv`, apply JQL selector, and print results
+
+Notice that first row is blank due to api error (bad url).
 
 ```
-$ qsv fetch  3 --jql '."places"[0]."place name"' test.csv
+$ qsv fetch 3 test.csv --jql '"places"[0]."place name"'
+[00:00:00] [==================== 100% of 4 records. Cache hit ratio: 0.00% - 4 entries] (6/sec)
+""
 Beverly Hills
 San Francisco
 Anaheim
 ```
 
-### Fetch url from `URL` column of `test.csv`, apply JQL selector, and put results into new column named City
+### Fetch data via `URL` column of `test.csv`, apply JQL selector, and put results into new column named City
+
+Notice that on error, instead of blank value, error message can be stored via `--store-error` flag.
 
 ```
-$ qsv fetch URL --new-column City --jql '."places"[0]."place name"' test.csv
+$ qsv fetch URL test.csv --jql '"places"[0]."place name"' -c City --store-error
+[00:00:00] [==================== 100% of 4 records. Cache hit ratio: 0.00% - 4 entries] (6/sec)
 Country,ZipCode,URL,City
+US,99999,http://api.zippopotam.us/us/99999,HTTP 404 - Not Found
 US,90210,http://api.zippopotam.us/us/90210,Beverly Hills
 US,94105,http://api.zippopotam.us/us/94105,San Francisco
 US,92802,http://api.zippopotam.us/us/92802,Anaheim
+
+
 ```
 
-### Fetch url from `URL` column of `test.csv`, use JQL to select multiple values, and put them into new column
+### Fetch data via `URL` column of `test.csv`, use JQL to select multiple values, and put them into new column
 
 Please note, multiple values get concatenated into a single quoted string with comma as separator.
 
 ```
 $ qsv fetch URL --new-column CityState --jql '"places"[0]."place name","places"[0]."state abbreviation"' test.csv
-[00:00:00] [==================== 100% of 3 records. Cache hit ratio: 0.00% - 3 entries] (7/sec)
+[00:00:00] [==================== 100% of 4 records. Cache hit ratio: 0.00% - 4 entries] (7/sec)
 Country,ZipCode,URL,CityState
+US,99999,http://api.zippopotam.us/us/99999,
 US,90210,http://api.zippopotam.us/us/90210,"Beverly Hills, CA"
 US,94105,http://api.zippopotam.us/us/94105,"San Francisco, CA"
 US,92802,http://api.zippopotam.us/us/92802,"Anaheim, CA"
 ```
 
-### Fetch with explicit rate limit set, and pipe output to a new csv
+### Fetch data via `URL` column of `test.csv`, with invalid jql selector
+
+```
+$ qsv fetch URL test.csv --jql '"place"[0]."place name"'
+[00:00:01] [==================== 100% of 4 records. Cache hit ratio: 0.00% - 4 entries] (4/sec)
+""
+""
+""
+""
+
+$ qsv fetch URL test.csv --jql '"place"[0]."place name"' --store-error
+[00:00:01] [==================== 100% of 4 records. Cache hit ratio: 0.00% - 4 entries] (6/sec)
+HTTP 404 - Not Found
+"Node ""place"" not found on the parent element"
+"Node ""place"" not found on the parent element"
+"Node ""place"" not found on the parent element"
+
+```
+
+### Fetch with explicit rate limit, and pipe output to a new csv
 
 ```
 $ qsv fetch URL test.csv --rate-limit 3 --jql '"places"[0]."longitude","places"[0]."latitude"' -c Coordinates > new.csv
-[00:00:01] [==================== 100% of 3 records. Cache hit ratio: 0.00% - 3 entries] (5/sec)
+[00:00:01] [==================== 100% of 4 records. Cache hit ratio: 0.00% - 4 entries] (4/sec)
 $ cat new.csv
 Country,ZipCode,URL,Coordinates
+US,99999,http://api.zippopotam.us/us/99999,
 US,90210,http://api.zippopotam.us/us/90210,"-118.4065, 34.0901"
 US,94105,http://api.zippopotam.us/us/94105,"-122.3892, 37.7864"
 US,92802,http://api.zippopotam.us/us/92802,"-117.9228, 33.8085"