2624/add cow to swap modal (#359)

* Added COW to common tokens

* Update the COW place in token list

* Add a list of prioritised tokens

src/custom/components/SearchModal/CurrencySearch/CurrencySearchMod.tsx

@@ -24,7 +24,7 @@ import CommonBases from 'components/SearchModal/CommonBases'
 import CurrencyList from 'components/SearchModal/CurrencyList'
 import { filterTokens, useSortedTokensByQuery } from 'components/SearchModal/filtering'
 import ImportRow from 'components/SearchModal/ImportRow'
-import { useTokenComparator } from 'components/SearchModal/sorting'
+import { useTokenComparator } from './sorting'
 import { PaddedColumn, SearchInput, Separator } from 'components/SearchModal/styleds'
 import useNetworkName from 'hooks/useNetworkName'
 import { ContentWrapper } from '.' //mod

src/custom/components/SearchModal/CurrencySearch/sorting.ts

@@ -0,0 +1,63 @@
+import { Currency, CurrencyAmount, Token } from '@uniswap/sdk-core'
+import { useMemo } from 'react'
+
+import { useAllTokenBalances } from 'state/wallet/hooks'
+
+const PRIORITISED_TOKENS = ['COW', 'GNO']
+
+// compare two token amounts with highest one coming first
+function balanceComparator(balanceA?: CurrencyAmount<Currency>, balanceB?: CurrencyAmount<Currency>) {
+  if (balanceA && balanceB) {
+    return balanceA.greaterThan(balanceB) ? -1 : balanceA.equalTo(balanceB) ? 0 : 1
+  } else if (balanceA && balanceA.greaterThan('0')) {
+    return -1
+  } else if (balanceB && balanceB.greaterThan('0')) {
+    return 1
+  }
+  return 0
+}
+
+function getTokenComparator(balances: {
+  [tokenAddress: string]: CurrencyAmount<Currency> | undefined
+}): (tokenA: Token, tokenB: Token) => number {
+  return function sortTokens(tokenA: Token, tokenB: Token): number {
+    // -1 = a is first
+    // 1 = b is first
+
+    // sort by balances
+    const balanceA = balances[tokenA.address]
+    const balanceB = balances[tokenB.address]
+
+    const balanceComp = balanceComparator(balanceA, balanceB)
+    if (balanceComp !== 0) return balanceComp
+
+    // Mod: modify tokens list by prioritised list
+    const indexA = PRIORITISED_TOKENS.indexOf(tokenA.symbol || '')
+    const indexB = PRIORITISED_TOKENS.indexOf(tokenB.symbol || '')
+
+    if (indexA !== -1 && indexB !== -1) {
+      return indexB < indexA ? 1 : -1
+    } else if (indexA !== -1 || indexB !== -1) {
+      return indexB !== -1 ? 1 : -1
+    }
+
+    if (tokenA.symbol && tokenB.symbol) {
+      // sort by symbol
+      return tokenA.symbol.toLowerCase() < tokenB.symbol.toLowerCase() ? -1 : 1
+    } else {
+      return tokenA.symbol ? -1 : tokenB.symbol ? -1 : 0
+    }
+  }
+}
+
+export function useTokenComparator(inverted: boolean): (tokenA: Token, tokenB: Token) => number {
+  const balances = useAllTokenBalances()
+  const comparator = useMemo(() => getTokenComparator(balances ?? {}), [balances])
+  return useMemo(() => {
+    if (inverted) {
+      return (tokenA: Token, tokenB: Token) => comparator(tokenA, tokenB) * -1
+    } else {
+      return comparator
+    }
+  }, [inverted, comparator])
+}

src/custom/constants/routing/routingMod.ts

@@ -23,6 +23,7 @@ import {
   // WBTC_ARBITRUM_ONE,
   // WBTC_OPTIMISM,
   WETH9_EXTENDED,
+  COW,
 } from 'constants/tokens'
 
 import { USDC_XDAI, /* USDT_XDAI, */ WBTC_XDAI, WETH_XDAI } from 'utils/xdai/constants'
@@ -80,6 +81,7 @@ export const COMMON_BASES: ChainCurrencyList = {
   [SupportedChainId.MAINNET]: [
     // ExtendedEther.onChain(SupportedChainId.MAINNET),
     DAI,
+    COW[SupportedChainId.MAINNET],
     USDC,
     USDT,
     WBTC,
@@ -92,6 +94,7 @@ export const COMMON_BASES: ChainCurrencyList = {
   [SupportedChainId.RINKEBY]: [
     // ExtendedEther.onChain(SupportedChainId.RINKEBY),
     WETH9_EXTENDED[SupportedChainId.RINKEBY],
+    COW[SupportedChainId.RINKEBY],
     DAI_RINKEBY,
     USDC_RINKEBY,
     USDT_RINKEBY,
@@ -120,6 +123,7 @@ export const COMMON_BASES: ChainCurrencyList = {
   [SupportedChainId.XDAI]: [
     // ExtendedEther.onChain(SupportedChainId.XDA),
     USDC_XDAI,
+    COW[SupportedChainId.XDAI],
     /*USDT_XDAI,*/ WBTC_XDAI,
     WETH9_EXTENDED[100],
     WETH_XDAI,